4(l4 PROF. ITARTT TIAM MRHKA ON THE 



longitiuliiia] and an anterior ascending portion. The longi- 

 tudinal portion passes forAvai'ds from the funnel, and is about 

 105 /J in length; its last part lies over the upper Avail of the 

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

 portion, about 90jLt in length, lies just behind septum 5/6. In a 

 few specimens the longitudinal poition formed a distinct curve 

 towards the ventrai body-wall before rising to be continued into 

 the ascending portion. The cells lining the vas deferens are 

 about half as high as those of the fiinnel, have oval nuclei at the 

 base, and are without 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 ventrtil 

 • 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 /a 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 ya by 15 /x,, with oval nuclei lying at the base ; outside 

 the epithelium is a thick coat of circulai- muscular fibres. 



The ejacula,tory duct, about 78 fi in length, opens at the top of 

 a tubular depi'ession of the ventral body-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 with elongated nuclei, and has 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 bod^^-wall. There are a few blood-vessels around the 

 atrium and jirostatic cells. Two bands of muscle-fil)res. arising 

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

 opening lies internal to and at the level of the ventral sets© about 

 the middle of segment vi. 



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

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

 mass of sphei-ical and elliptical yolk granules about 7-15 /x, in 

 diameter. The ova are fairly large, and lie in two or three 

 masses. 



The female funnel, about 4:5 fi 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 spermatheca? occupy the fifth segment. The ampulla 



