^o. 447.] 



parts as given by. him and will, therefore, quote freely fro 

 description. The Opisthobranchia are all hermaphn 

 Haminea is no exception to the general rule and comes 

 the first type as described by Lang. The 

 germinal gland consists of numerous "con- 

 verging diverticula." The eggs and sperm- 

 atozoa arise from the same part of the 

 gland and are intermingled. During their 

 development they become detached and 

 lie free in the cavity of the gland. The 

 ducts of H. solitaria are considerably com- 

 plicated, because of the development of 

 the accessory organs. The ovotestis lies 

 between the lobes of the liver and the pos- pJ^*"" ^■""^ "'^ ' 

 terior part of the body ; this gland has 



numerous branches, which finally collect into the common 

 hermaphroditic duct ; the duct empties into the common genital 

 cloaca. The genital aperture opens 

 into the extreme right anterior part 

 of the mantle cavity, and from it 



I the head and foot. When it is at rest its sheath lies 

 in the cephalic cavity near the buccal mass." Two important 

 glands open into the genital cloaca by a common duct; first, 

 the albumen gland, which is comparatively small iind lies iqion 

 the surface of a second, known as the nidanienlal gland : the 

 latter is much larger than the former and yields the outer i)ro- 

 tective envelope of the egg. The albumen gland supplies the 

 albumen for the egg capsule. 



The " receptaculum seminis " is connected by a short duct 

 with the genital cloaca and receives the spermatozoa at the time 

 of copulation. Of course the size of this vesicle varies according 

 to the season and according to whether or not it is full of 

 spermatozoa. 



