464 



PROF. TTAIITT TlAM MEHRA OX THE 



loiigitndiiial nnd an anterior Msceiidiiig portion. 'The longi- 

 tudinal portion passes forwai'ds from the fnnoel, and is abont 

 105 ft in length ; its last pai't lies over the npper wall of the 

 spernj-sac. The tube then bends upwards ; the vertical ascending 

 portion, ahont 90 jj. in length, lies just behind septum 5/6. In a, 

 few specimens the longitudinal portion formed a distinct curve 

 towards the ventral bod^^-wa.ll before rising to })e continued into 

 the ascending portion. The cells lining the vas deferens are 

 about half as high as those of the funnel, ha.A^e oval nuclei at the 

 base, and are w^ithout distinct cell-outlines ; there is a thin 

 covering of muscle-fibres outside the epithelium. The tube 

 enters the atrium on its anterior face much above the middle ; 

 the ascending part of the duct as it opens into the atrium is 

 surrounded by a thick coat of muscle- fibres, continued onto it 

 from the muscular covering of the atrium ; the change from the 

 cubical cells of the duct to the columnar cells of the atrium 

 is sudden. 



A bundle of muscle-fibres directed upwards from the ventral 

 body-wall is attached to the ascending portion ; and a few fibres 

 connect it above to the dorsal body-wall behind septum 5/6. 



The atrium is a large pear-shaped body, taking up nearly the 

 whole length of its segment, 230-240 in height and about 

 190 /X in length antero-posteriorly ; in only one specimen were 

 spermatozoa seen in its interior. The epithelium is columnar, 

 the cells 18/x by 15 fx, with oval nuclei lying at tlie base ; outside 

 the epithelium is a thick coat of circular muscular fibres. 



Tlie ejaculatory duct, about 78 ^ in length, opens at the top of 

 a tubular depression of the ventral bod)— wall about 42 /x in depth, 

 and is capable of being everted, when it projects slightly as a. 

 short pseudo-penis. The epithelium of the duct consists of 

 columnar cells w^ith elongated nuclei, and lias a thick investment 

 of muscle-fibres. 



The "prostate'" consists of a large mass of pear-shaped cells 

 around the ejaculatory duct ; the cells contain granular pro- 

 toplasm and a large oval or rounded nucleus near the base. 

 A. few muscle-fibres surround and enter the mass of cells from 

 the ventral body-wall. There are a few l)lood- vessels around the 

 atrium and prostatic cells. 'J'wo bands of muscle-fibres, arising 

 from the setal sac, are attached to the atrium behind. The male 

 opening lies internal to and at the level of the ventral settle about 

 the middle of segment vi. 



The ovisac, formed by the backward bulging of septum 6/7, 

 and, as usual, enveloping the sperm-sac, is filled with a large 

 mass of spherical and elliptical yolk granules about 7-15 /a in 

 diameter. The ova are faiily large, and lie in tw^o or three 

 masses. 



The female funnel, about 45 in height, lies over the lower 

 portion of septum 6/7 near the ventral parietes in segment vi. 

 No female opening was seen. 



The large spermathecre occupy the fifth segment. The ampulla 



