334 HELICID^. 



10. VERTIGO OVATA, Say. 

 Plate LXXI. Figuke 4. 



V. testa minuta, ventricosa, sub-conica, succinea ; anfract- 

 ibus quinque, convexis ; apertura seini-circulari, bilobata, 

 dentibus sex instructa ; labro albo, bicurvato, expanse ; 

 umbilico perforate. 



SYNOMYMS AND REFERENCES. 



Vertigo ovata. Sat, Journ. Acad. Not. Sc. II. 375. 

 ^uj)a ovata, Sager, Michigan Catalogue, 14. 



Gotn,D, Monog. of Pupa, 8 ; Bost. Journ. Nat. Hist. IV. 350. 



De Kay, New York Rep. 31 ; Nat. Hist. N. Y. 50, pi. 4, {. 50. 



Adams, Vermont Moliusca, 7 ; Silliman's Journal, XL. 271. 



Say, Exped. St. Peter's, IJ. 259, pi. 15, f. 5. 

 Pupa modeita, Gould, Invertebrata, l&S, f. 119. 



DESCRIPTION. 



Animal. Head and back deep cherrj-red, posterior 

 part of foot bluish, base whitish. Tentacles larger towards 

 the extremities, or remarkably club-shaped ; ocular points 

 distinct. The anterior extremity of the foot is dilated 

 and trilobate, the middle lobe minute, lateral lobes 

 i-ounded. Length rather greater than that of the axis 

 of the shell. 



Shell minute, ovate-conic, ventricose, dark amber- 

 colored ; whorls five, very convex, the last much in- 

 flated, diminishing rather rapidly to a somewhat acute 

 apex, with an indentation towards the aperture ; suture 

 rather deep ; lip thin, somewhat expanded, with a groove 

 behind and a thickening within ; aperture in general out- 



