18 A rt. 4. -S. Goto and H. Kikuclii: 



process of the supporting rod; these two soon unite and 

 proceed backwards to merge into the longitudinal dermal muscles. 

 The penis and the supporting rod are subequal in length, 108<"; 

 the basal mass is 72/* long. 



Side by side with the sperm duct open into the penis base 

 two accessory glands, the anterior and the posterior prostate. In 

 the posterior one, the fine duct that opens into the penis leads into 

 a fusiform sac situated on the left side of the median line and 

 containing a granular, yellowish secretion especially conspicuous 

 in life; where it crosses the sperm duct it lies more dorsally. 

 This fusiform sac is continued backwards into a larger sac of 

 irregular form, whose contour becomes fainter backwards. Into 

 this reservoir open by long necks numerous unicellular glands, 

 which lie between the ovary and the genital apertures, both in 

 the area bounded on either side by the intestinal cœca and outside 

 the latter close to the lateral margin of the body. The cytoplasm 

 ■of these cells is finely granular and stains well with haematoxylin 

 and carmin; they may be 24/* by 36/z. The anterior prostate, 

 which opens side by side with the posterior, has also a very fine 

 duct which almost immediately enlarges into a somewhat reniform 

 sac with distinct muscular wall lying oftener on the right side of 

 the penis and containing a transparent colourless secretion, in life 

 contrasting sharply with the surrounding organs. The sac 

 narrows at its front end into a duct of small calibre, which curves 

 backwards and to the right and then expands again into a large 

 sac of irregular contour, into which open numerous gland cells. 

 These are situated almost entirely between the intestinal cccca of 

 both sides and the posterior prostate; their cytoplasm stains but 

 very slightly with haematoxylin and carmin and can therefore be 

 distinguished from the cells of the posterior prostate without 

 difficulty; the cells are also distinctly smaller, being 12/* by 24//, 

 and the nuclei are vesicular and contain each a very distinct 

 -chromatin spherule. 



The ovary is a cordiform organ situated directly in front of 

 the testis, sometimes overlapping the latter with its emarginate 

 hind end, where the youngest ova are situated. From its front 



