Dentition of Pulmonata. 25 



Zonites friabilis, W. G. Binney. 

 Mr. A. G. Wetherby. 



Jaw as usual in the genus. 



Lingual membrane similar to that above described of Z. capnodes. 

 Teeth about 57-1-57, with six perfect laterals. 



The genital system is figured on pi. V, fig. n. The ovary (11) is stout, 

 light-brown, and blunt. The oviduct (8) is short. The vagina is long 

 and narrow, with a yellow prepuce-like expansion at the entrance of the 

 duct of the genital bladder, which is near the base. The genital bladder 

 (0) is large, oval, on a duct of about equal length and size as the vagina- 

 The penis sac (5) is long and slender, and peculiar^ characterized by a 

 lateral bulbous expansion near its base, bearing the retractor muscle (C). 

 Beyond this bulb the sac is narrow, but gradually expands, and towards its 

 end again very gradually tapers towards the apex, where the vas deferens 

 (7) enters. Its orifice is side by side with that of the vagina. 



I found no dart in the bulb-like organ attached to the penis. It prob- 

 ably is a form of prostate. The external orifice is under the mantle. 



Zonites inornatus, Say. 



The genitalia (pi. V. fig. i) have the same general arrangement as in 

 Z.friahilis, herewith described. The ovary (11), however, is very much 

 more developed, being in this species the most conspicuous organ in the 

 system; the epididymis (<}) is less convoluted, the oviduct (8) is longer, 

 the vagina shorter, the genital bladder (0) more clavate, with a shorter 

 duct (1G), and there is a small globular vaginal prostate (13). 



Zonites seulptilis, Bland. 



Tennessee. Miss Annie E. Law. 



• Jaw as usual in the genus. 



Lingual membrane long and narrow. Teeth about 40-1-40, with four 

 perfect laterals. Centrals tricuspid, laterals bicuspid, the side cusps of 

 each being almost obsolete, but surmounted by a triangular sharp point. 

 Marginals aculeate. The dentition is of the same type as in Z. capnodes, 

 see above. (PI. II, fig. IV.; Fig. b represents the two extreme marginal 

 teeth. 



Zonites Elliotti, Redfield. 



Hayesville, N. C. Miss Annie E. Law. 



Lingual membrane as usual in the genus. It will be noticed that there 

 are not any well developed side cusps to the centrals and laterals, though 

 there are well developed cutting points. Teeth about 32-1-32, with six 

 perfect laterals. 



