42 PROCEEDINGS OF THE ACADEMY OF 



shells. The genital bladder is long, with a long, narrow dnct en- 

 tering the upper part of the vagina. The vagina is short and 

 swollen. The penis sac is long, stout, blunt at apex, where the 

 retractor muscle is inserted. The vas deferens becomes greatly 

 swollen before it enters the sac of the penis, which it does above 

 the insertion of the retractor muscle. 



As the shells of some forms of this species are difficult to dis- 

 tinguish from some forms of Patula solifaria, it is interesting to 

 state that the genitalia of a specimen of the latter from the same 

 locality', offer very distinct specific characteristics, agreeing with 

 Dr. Leidy's figure in Terr. Moll. U. S. I. 



Macrocyclis Vancouverensis, Lea. 



The genitalia are figured on pi. IV., fig. i. The epididymis is 

 extremely long and very large, forming the peculiar feature of the 

 sj^stem. The genital bladder is oval, with a long duct, which is 

 very much broader at the end nearer the vagina. The penis sac is 

 long, gradually tapering at its apex, where it receives the vas de- 

 ferens. Upon the side of the vagina, about the middle of its 

 length, is a wart-like protuberance, which may be a dart sac or a 

 vaginal prostate. 



A comparison of Dr. Leidy's figure of the genitalia of M. con- 

 cava in Terr. Moll. U. S. I. shows considerable difference between 

 the two species, especially in the epididymis. 

 Zonites demissus, Binney. 



The genitalia are like those of Z. intertexhis, Binney, figured by 

 Dr. Leidy (Terr. Moll. U. S. I.). The accessory glands of the 

 dart sac are rather shorter in demissus. 



Amphibulima appendiculata, Pfr. 



Elsewhere (Ann. Lye. Nat. Hist., N. Y. x. 206, pi. ix. f. 2, 6, 9, 

 11) we have fully described the external appearance, jaw, lingual 

 membrane, and shell of this species, pointing out its differences 

 from Succinea, from Pellicula, from Omalonyx, and all other de- 

 scribed genera. 



I now give (pi. VIII. fig. 5) a figure of its genital system, with 

 notes on other organs, drawn from specimens in alcohol. 



The external orifice of generation is behind the right eyepedun- 

 cle. The orifice of respiration is on the right mai'gin of the man- 

 tle, slightly to the rear of its middle. There is a distinct locomo- 

 tive disk to the foot. The eyepeduucles must be short and stout. 

 The digestive and nervous systems present no remarkable feature. 



