Little Theories in Six and Seven Dimensions

We discuss theories with 16 and 8 supercharges in 6 and 7 dimensions. These theories are defined as world-volume theories of 5- and 6-branes of type II and M theories, in the limit in which bulk modes decouple. We analyze in detail the spectrum of BPS extended objects of these theories, and show that the 6 dimensional ones can be interpreted as little (non-critical) string theories. The little 5-branes of the 6 dimensional theories with 16 supercharges are used to find new string theories with 8 supercharges, which have additional group structure. We describe the web of dualities relating all these theories. We show that the theories with 16 supercharges can be used for a Matrix description of M-theory on T^6 in the general case, and that they also reproduce Matrix theory on T^5 and T^4 in some particular limit.Comment: 23 pages, LaTeX, no figures; references adde

<i>Poirieria (Pazinotus) philcloveri</i>, a new species from the Philippine Islands (Gastropoda: Muricidae: Muricinae)

Poirieria (Pazinotus) philcloveri is described and compared with two more or less related species: P. (P.) smithi (Schepman, 1911) and P. (P.) falcatiformis (Thiele, 1925), the type of which are here illustrated to show the three recent Indo-Pacific species of this subgenus

Description of a new species of <i>Haustellum</i> (Gastropoda: Muricidae) from the western Indian Ocean

Haustellum danilai is described from 3 specimens from the Saya de Malha Bank in the Western Indian Ocean. The new species is similar to H. malabaricus (E.A. Smith, 1894), H. purdyae (Radwin & D'Attilio, 1976) and H. mindanaoensis (Sowerby, 1841)

<i>Pterymarchia</i> n. gen. and <i>Vaughtia</i> n. gen., two new muricid genera (Gastropoda, Muricidae: Muricinae and Ocenebrinae)

Two new genera of Muricidae are named: Pterymarchia n. gen. and Vaughtia n. gen. They include species formerly classified in Pterynotus Swainson, 1833 (Muricinae), Ocenebra Gray, 1847, and Urosalpinx Stimpson, 1865 (Ocenebrinae). Following new synonyms are listed: Tritonalia semidisjuncta Turton, 1932 and T. aedicularum = Vaughtia babingtoni (Sowerby, 1892); Ocenebra hayesi Lorenz, 1995 = V. jucunda (Thiele, 1925); Ocenebra newmanni Lorenz, 1990 = V. dunkeri (Krauss, 1848); Cominella fuscopicta Turton, 1932 = V. fenestrata (Gould, 1860); Purpura cribrosa Krauss, 1859 = V. scrobiculata (Dunker, 1846)

The Trophoninae (Gastropoda: Muricidae) of the New Caledonia region

New Caledonian representatives of the muricid subfamily Trophoninae are revised. Two new genera are described and a total of 32 species are recorded, of which 24 are new to science. One species is refered to Apixystus Iredale, 1929, four to Trophonopsis Bucquoy & Dautzenberg, 1882, twenty-two to Leptotrophon n. gen., four to Conchatalos n. gen., and one to Litozamia Iredale, 1929. Two species formerly described in Poirieria (Paziella) (Muricinae) are transfered to Trophoninae. Three species are also known from SE and E Australia, and/or from Indonesia. The others are known only from the New Caledonian region. Most species live between 250 and 775 meters; only one species occurs in 105-110 m and three range deeper than 1000 m

<i>Chicoreus (Naquetia) triquiter vokesae</i> subs. nov., a new name for a misidentified species (Gastropoda: Muricidae)

The subgenus Naquetia was recently studied by the author (Houart, 1985). Further comparative study of the protoconchs lead to the discovery of an unidentified subspecies, occuring in the Western Indian Ocean, which is here named

Description of a new species of <i>Chicoreus (Triplex)</i> from the Philippine Islands

Chicoreus (Triplex) dodongi n. sp. is named from Samar, in the Philippine Islands. It is compared with C. (T.) strigatus (Reeve, 1849), C. (T.) akritos Radwin & D'Attilio, 1976, and with young specimens of C. (T.) torrefactus (Sowerby, 1841) and C. (T.) saulii (Sowerby, 1834)

On the Opening of Branes

We relate, in 10 and 11 dimensional supergravities, configurations of intersecting closed branes with vanishing binding energy to configurations where one of the branes opens and has its boundaries attached to the other. These boundaries are charged with respect to fields living on the closed brane. The latter hosts electric and magnetic charges stemming from dual pairs of open branes terminating on it. We show that charge conservation, gauge invariance and supersymmetry entirely determine these charges and these fields, which can be seen as Goldstone fields of broken supersymmetry. Open brane boundary charges can annihilate, restoring the zero binding energy configuration. This suggests emission of closed branes by branes, a generalization of closed string emission by D-branes. We comment on the relation of the Goldstone fields to matrix models approaches to M-theory.Comment: 13 pages, LaTeX, no figure

A new <i>Scabrotrophon</i> (Gastropoda: Muricidae) from Hawaii and discussion about the generic classification of <i>Boreotrophon kamchatkanus</i> Dall, 1902, a related species

A small muricid collected at 414 m off the Hawaiian Island of Oahu is described and compared, on the basis of shell characters only, with a syntype and two other specimens of Scabrotrophon kamchatkanus (Dall, 1902) (new combination) from the Northern Pacific. SEM images of the operculum, radula, and of the penis are illustrated for the new species