524 Ml-. C. E,. Narayana Rao on the Anatomy of 



recesses in tliechamher. Surrounding this internal naembrane 

 is a raass of subsplierical cells, which on account of mutal pres- 

 sure may assume an oval shape. These and the lining cells 

 stain deeply, and the nucleus in them is large and centrally 

 placed. A few of these surrounding spherical cells look 

 empty in sections, having previously discharged their contents 

 into the vesicular chamber. None of these glandular cells 

 possess any ductules. In the more mature forms, in which 

 the muscles of the pouch are gathered into spiral hoops, the 

 internal cavity is disposed into a slight spiral form, and in 

 those forms in which the muscles are not so aggregated 

 they form a close and continuous investment, which accounts 

 for the very tough character of the whole organ. Tiie outer 

 membrane of the pouch is composed of numerous layers of 

 cubical cells, those at the surface being almost flat. The 

 protoplasm of these cells is granular, and the nucleus stains 

 deeply. The blood-vessels run in all directions in the 

 substance of the gland, and in the transveise section they 

 appear cut across and also lengthwise. The whole wall is 

 further impregnated by a mass of white granular substance 

 of an albutninous nature, staining with htematoxyliu and 

 derived from the glandular cells. It is the presence of these 

 bodies which gives a milky-white shimmer and opacity to 

 these organs, which become almost transparent on dissolving 

 them. 



The nephridial system of this • species of Drawlda is 

 remarkable. The nephridia in the hinder region of the 

 body, where the alimentary canal becomes thicker, give oft' a 

 duct from the third lobe, which opens into the intestine. 

 The tubules from the two nephridia in any segment in this 

 region have a separate opening. Thus each nephridium 

 opens outside on the seta-line cd, as well as into the in- 

 testine. More anteriorl}^, the nephridia seem to have a 

 similar secondary opening into the intestine, at least into the 

 gizzards, but I have not succeeded in finding out if all the 

 nephridia have an intestinal opening. Depending from 

 the third lobe, close to the point where a vascular twig from 

 the subiutestinal vessel enters it, is an accessory lobe, more 

 or less sacculated, containing minute bluish spherical bodies, 

 which lie on either side of the non-ciliated wide duct. 

 Possibly these bodies are concretions of waste matter. These 

 accessory lobes are absent from the more anteriorly placed 

 nephridia. In addition to the meganephridia, each somite 

 contains a pair of integumentary nephridia also. These are 

 composed of a much convoluted glandular tubule attached 

 to the peritoneal wall, being separated from its fellow on the 



