Secretion of fatty and albuminous yolk by Golgi bodies in Stomopneustes variolaris, Lamarck

1. The Golgi bodies in the oocytes of Stomopneustes secrete both fatty and albuminous yolk grains. 2. The Golgi vasicle enlarges into a vacuole inside which fatty yolk appears to be deposited. The Golgirim does not undergo any transformation. 3. Prior to secretion of albuminous yolk the mitochondria clump together. The Golgi vesicles by rupture give rise to scale or batonette like bodies. These attach themselves to the mitochondrial clumps and secrete albuminous yolk. The mitochondria in the fully developed yolk spheres are yolky. 4. The origin of both fatty and albuminous yolk in relation with the Golgi bodies only confirms the belief that the nature of the action of the apparatus is only by means of enzymes and that fat, fatty yolk and yolk are only secondary products resulting from the action of these enzymes on materials derived from mitochondria, cytoplasm, nucleolus, etc

Shark and shark-liver oil

This article does not have an abstract

On some squilla larvae from the Madras plankton

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An account of the development and breeding-habits of a brackish-water polychaete worm of the genus Marphysa

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On the nephridia of Prionospio cirrifera wiren

1. There are three pairs of U-shaped nephridia which occur in segments 4, 5 and 6. 2. A detailed description of the structure of the nephridia is given. 3. There are no nephridia in the middle and posterior segments. The genital products probably escape by rupture of the body wall

Early development and metamorphosis of the tropical echinoid Salmacis bicolor, agassiz

1. The full development of Salmacis bicolor, a tropical form has been traced both in regard to the external characters and several internal features. 2. The amnion has been shown to arise very early in development. 3. The development of the larval skeleton has been traced. 4. The metamorphosis and the post-larval stages have been described. 5. The absence of sexual periodicity in Salmacis bicolor has been proved

An analysis of the shape and structure of golgi bodies in the eggs of invertebrates with a note on the probable modes of origin of the golgi network

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The brackish-water fauna of Madras

The fauna of the brackish-waters of the city of Madras has been studied in detail with special reference to its relation with the habitat. The environmental conditions are described in detail. About ninety-two species of Invertebrates and fifty-six species of Vertebrates have been observed in the brackish-water. The fauna is predominantly marine and includes representatives of all major marine Invertebrate phyla except the Echinodermata. The freshwater species include a few Crustaceans, Molluscs and fish. The amphibious element in the fauna is well marked, and a number of mud-burrowing species are noted. Vertical and regional distribution of the organisms is described and the groups into which they may be classified according to their habits are indicated. An account of the breeding in brackish-water species is given. The general problems concerning the biology of animal life in the brackish-water are discussed in detail with special reference to the fauna described

On the possible effect of the environment on the cytoplasmic inclusions in the oocytes and oogonia of Dasychone cingulata, Salmacis bicolor, and Clibanarius olivaceus

1. The oogenesis of Dasychone and Salmacis has been worked out from oocytes collected during two different seasons. 2. Changes in the physico-chemical factors of the Sea and the Adyar river water have been studied. 3. Measurements of the ripe oocytes indicate a cousistent increase in size in the oocytes ofClibanarius and a decrease in Dasychone and Salmacis from January to June. It is presumed that these alterations in size are caused by variations in salinity. 4. In December-January preparations of Dasychone, fat-the only deutoplasmic inclusion-appears to be formed by the transformation of Golgi material. 5. In May-June fatty yolk alone has been observed in the eggs and this appears to be secreted by the dictyosomes. 6. The nucleoli and nucleolar buds are stained deep red in December-January while in May-June they are orange, of slightly varying shades. 7. In Salmacis also, there is a variation in the quantity of nutritive bodies, mitochondria and yolk in the two seasons. 8. An attempt has been made to show that the remarkable diversity of results obtained by workers on the same animal are due to variations in the environment: (1) seasonal, (2) geographical