p. 301-303 : ill. ; 24 cm.Includes 1 bibliographical reference (p. 301)

Crooke, J. J.

Whitfield, Robert Parr, 1828-1910.

American Museum of Natural History Scientific Publications

56.4, 32F (1181:74.9)Article XVIII.- NOTICE OF A NEW SPECIES OF FASCIOLARIAFROM THE EOCENE GREEN MARLS ATSHARK RIVER, N. J.By R. P. WHITFIELD.Some years ago I described in Monograph XVIII of the U. S.Geol. Surv. (=Vol. II, Pal. New Jersey) three species of large Fas-ciolaria from the Eocene green marls at Shark River, New Jersey,under the names F. hercules, F. samsoni, and F. propinqua. Now,in working over the J. J. Crooke material for incorporation with thegeneral palaontological collection for the purpose of cataloguing,there turns up an additional species of this peculiar nodose group ofthe genus that is typified among recent shells by Fasciolaria trape-zoidea. This new one differs from those described previously fromthis same horizon in being slightly shorter in the spire and below inproportion to the transverse diameter across the body volution; thebeak also is shorter, the nodes on the whorls are quite as prominent asin F. hercules and count ten on the body volution as in that, but thewhorls are shorter, giving a shorter spire. This species I propose todesignate by naming it after the donor of the material.Fasciolaria crookiana, sp. nov.FIGS. I AND 2.Shell large and massive, with the spire and beak from the middle of thebody volution subequal; volutions strongly nodose on the periphery and thenodes transversely oblique, the space between the nodes and the suture slopingrapidly at a low angle; body below the line of nodes somewhat swollen in theupper third, and below this rapidly contracting to the strong, short beak orcolumella; columella marked by a single nearly vertical plication or fold; sur-face, so far as determinable, marked only by lines of growth.Geological position and locality. - In the green marls of the Lower Eoceneat Shark River, New Jersey, in the collection presented to the Museum by thelate J. J. Crooke of Staten Island, N. Y.The specimen shows evidence of the shell having been quite thickin substance, like those of its living congeners, as there are numerouscasts of either worm or sponge borings in the shell substance whichseem to radiate from the crest of the nodes where the shell wouldprobably have had a greater degree of thickness than elsewhere.[301]302 Bulletin American Museum of Natural History. [Vol. XXI,Fig. T. Fasciolaria crookiana, front view.Whitfield, A New Species of Fasciolaria.Fig. 2. Fasciolaria crookiana, side view, showing the amount of compression.303I 905.]

New species of Fasciolaria

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