448 



MISS 8. M. FED.VBB OS EAETUWOEMS 



[May 17, 



The last hearts are in segment xiii. 



The sperm-sacs in segments xi. and xii. are small, but possibly 

 not fully developed. 



The spermiducal glands are large, with digitate lobes, which 

 extend from segment xvi. or xvii. to xx. The muscular sac 

 occupies nearly the whole width of segment xviii., with the spirally- 

 coiled duct lying on it. 



The spermathecce (fig. 2), of which there are three pairs in seg- 

 ments vii., viii., and ix. respectively, are very interestuig. Each one 



Fig. 2. 



Spermatheca from viith segment, right side, of Perichista crescentica : 

 p, pouch ; d, duct ; di, diverticulum ; g, gland. 



consists of an oval pouch with a duct of the same length. The diver- 

 ticulum is coiled up at the end into a little globular knot enclosed 

 in a delicate skin, iittached to the junction of the diverticulum 

 with the duct is a stalked white gland nearly equal in size to the 

 diverticulum. This gland lies forward, while the diverticulum 



