142 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



than the other. The contents of the diverticle also stains 

 intensely with red stains, but I have found no such dark 

 staining secretion in the larger part of the prostate. There 

 is also a difference in the structure of the glandular cells in 

 the two parts. Those of the diverticle are larger, more 

 twisted and bent, while those of the main prostate are 

 smaller and straighter. In the main prostate the epithelial 

 layer is surrounded by a narrow muscular layer which 

 winds in and out between the glandular cells, but in the 

 diverticle this muscular layer is reduced to a very few 

 strands not readily perceived. 



The muscular coat surrounding the prostates is exceed- 

 ingly powerful. It consists of three layers of which two 

 are entirely distinct. The outer longitudinal layer sur- 

 rounds a narrower transverse muscular layer, and this is 

 lined interiorly by another very narrow, but still recogniz- 

 able longitudinal layer, which here and there runs off to the 

 prostates, separating the diverticle from the main gland. 

 The two inner muscular layers are not always to be distin- 

 guished one from the other and are probably only differen- 

 tiated parts of one layer. The width of the diverticle is 

 greater than that of the inner prostate. In cross-sections it 

 will be seen that the diverticle embraces the main prostate 

 like a crescent and occupies the largest space inside the 

 common muscular coat. 



The secretion from the diverticle appears to be of a two- 

 fold nature. There is a thin cyanophile mucous secretion 

 and a thicker erythrophile one. The latter is generally 

 found in the shape of irregular rounded granules or glob- 

 ules surrounded by the cyanophile secretion. 



Judging from Beddard's figure (62, fig. 10), the differ- 

 ence in the size of the two glands is not great. In my 

 specimens the longer part of the prostate is much narrower, 

 occupying a comparatively small space within the muscular 

 coat. 



The globular enlargement of the sperm-duct at the ciliated 

 funnel resembles exactly the figures given by Beddard, but 

 the funnel itself is somewhat different. In Beddard's 



