FAMILY HELICID^E — SUCCINEA. 55 



(EXTRA-LIMITAL.) 



retusa. (Lea, Am. Phil. Trans. Vol. 5, p. 117, pi. 19, fig. 86.) Shell ovate-oblong, very thin, 

 pellucid; spire short; whorls three ; aperture dilated below, and drawn back. Color, yellowish. 

 Length, 0*7; diameter, 0-3. Cincinnati. 



GENUS BULIMUS. Bruguieres. Lamarck. 



Shell oblong, oval-oblong or turreted. Aperture simple or entire, rounded anteriorly. Colu- 

 mella straight, smooth. 



Obs. This genus comprises species which were found distributed by Linneus under the 

 genera Helix and Bulla. It forms the subgenus Cochlicopa of Ferussac, but the best con- 

 chological writers prefer arranging it as a separate genus in the vicinity of Helix. The 

 animals are terrestrial, and some of them are remarkable for the size and stony hardness of 

 their eggs. Few species have been detected in this country. 



BULIMUS LUBRICUS. 

 PLATE III. FIG. 43. — (STATE COLLECTION.) 



Bulimus lubricus. Bbugciebes, Diet. No. 23. 



B. id. Say, Long's Expedition St. Peters, Vol. 2, p. 259. Adams, Am. Jour, of Sci. Vol. 40, p. 270. 



B. id. Gould, Invertebrata of Massachusetts, p. 193, fig. 124. 



Description. Shell very small, thin, polished and transparent, elongate-oval. Whorls five 

 or six, rounded, lessening to the obtuse apex, with a distinct suture. Aperture small, oval, 

 not broadly rounded at the base. Pillar-lip slightly thickened, so as to present the appearance 

 of a slight notch at the base. Lip simple, thickened within. 



Color. Yellowish olive ; the inner margin of the lip light reddish : often smoky horn-colored 

 throughout. 



Diameter, 0-1. Height, 0'3. 



This species, which was first detected by Mr. Say in the Northwest territory, has since 

 been ascertained to have a wide geographical range. It occurs under rotten wood and leaves _ 

 The specimen which furnished the above description was obtained from Oriskany, Oneida 

 county, but it doubtless occurs throughout every part of the State. I have never had an 

 opportunity of examining European specimens of this species. 



