ZOOLOGY. MOLLUSCA. 199 



in Zonites. The penis is rather short, convoluted, thick, the vas 

 deferens inserted at its termination, is rather short. The 

 cloaca is large, wide ; below the penis there is a long club- 

 shaped sac, its base dilated where it enters the cloaca. This 

 is proably a dart-sack, although the specimens examined by 

 me contained no dart. On the penis near its base arises a 

 duct, which uniting with another arising opposite the penis, is 

 continued into a long duct coiled around the vagina, and ends 

 in a small oval bulb, the receptaculum seminis or spermatheca. 

 The albumen gland, etc., offer no unusual characters. I did 

 not dissect out the ovo-testis. My specimens were quite hard, 

 having been in strong spirit. 



The connection of the duct of the spermatheca with the penis 

 is unique, so far as I know, in the Pulmonata, and suggests the 

 probability of self-impregnation. 



Mr. W. G. Binney has kindly called my attention to his note 

 upon the dentition and jaw of //. Bermudensis and the denti- 

 tion of //. circumfirmata in the Ann. N. Y. Acad. Sci., iii, p. 

 86, 105. The first species is placed by him with doubt in 

 Zonites with the remark that " it seems to belong to no de- 

 scribed genus." H. circumfirmata is left in Microphysa, for want 

 of a better place, but Mr. Binney points out the fact that the 

 species belongs to the Vitrinea rather than to the Helicea. 



Poecilozonites circumfirmatus Iledfield (PI. 16, fig. F). 



A form with much the appearance of Hyalosagda, a group 

 with which it has been classed by some authors. It is a deli- 

 cate, subtranslucent, yellowish-brown shell, marked with brown 

 streaks, spots and flammules ; the whorls are separated by mod- 

 erately impressed sutures ; the apex is like that of P. Reinianus ; 

 the last whorl is more or less angulate around the periphery, 

 rather flattened below the angle, then convex, indented around 

 the narrow, deeply perforating umbilicus ; there is a white cal- 

 careous deposit around the columella, inside, as in the other 

 species, and an acute white lamella which revolves within the 

 base near to the periphery, a character which none of the pre- 



