BY SARAH O. BREXNAN. 69.5- 



reuiaiudei* of the duct the lining consists of tall narrow columnar 

 cells, whose ends, bordering on the lumen of the duct, stain 

 lightly, while the main portit)ns of the cells, especially their 

 inner ends, stain very deeply. The diverticulum differs con- 

 siderably in its histological character from the pouch itself. The> 

 lumen of its narrow stalk is essentially similar to that of the 

 main duct, though the cells are smaller, while the interior of the- 

 diverticulum is lined by an irregularly-ridged epithelium with 

 bundles of spermatozoa attached between the ridges. The 

 muscular investment of the diverticulum further is much thicker 

 than that of the main pouch. In a young specimen 32 mm. in 

 length (preserved) the spermathecje are represented b}' simple 

 invaginations of the epidermis -3 mm. in length, extending to^ 

 about the middle of the thickness of the body wall. 



Male organs.— These comprise two pairs of testes (fig. 1, aJ., 

 2i-t.)\ two pairs of funnels («.7-., JJ.r.) leading into a pair of vasa 

 deferentia {v.d.); two pairs of lateral seminal vesicles (anterior 

 and posterior, a.s.s., p.s.s ); two median sperm reservoirs (a.s.7-., 

 p.s.r.) occupying a segment each; and a pair of bilobed spermi- 

 ducal (prostate) glands (sp.ff.). 



Following Hensen's terminology in use at the time Fletcher 

 wrote his account, the median sperm reservoirs and the seminal 

 vesicles are described as the testes, and as a consequence the true 

 testes were not observed. 



(a) Testes.- — The two pairs of testes (a.t., p.t.) are situated in 

 segments x. and xi. Each is a somewhat pear-shaped body, 

 attached by its broadei- end to the anterior septum of the seg- 

 ment. Opposite the testes, and situated in the posterior portion 

 of the segments, are the rosettes («.?•., p.r.) of the vasa deferentia^ 

 whose ciliated lips are very greatly folded. The duct from the 

 anterior rosette of each side is joined by the duct from the 

 posterior rosette about the middle of segment xii., (fig. l,i\d.u.), 

 thence the vas deferens (v.d.) passes back as a straight, exceed- 

 ingly slender tube ('(ilO mm. in diameter) lying below the ctelomic 

 peritoneum and partially embedded in the musculature of the 



