334 HELICID^E. 



10. VERTIGO OVATA, SAY. 

 PLATE LXXI. FIGURE 4. 



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

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

 dentibus sex instructa ; labro albo, bicurvato, expanse ; 

 umbilico perforate. 



SYNONYMS AND REFERENCES. 



Vertigo ovata, SAY, Journ. Acad. Nat. Sc. II. 375. 

 Pupa ovata, SAGER, Michigan Catalogue, 14. 



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



DE KAY, New York Rep. 31 ; Nat. Hist. N. Y. 50, pi. 4, f. 50. 



ADAMS, Vermont Mollusca, 7 ; Silliman's Journal, XL. 271. 



SAY, Exped. St. Peter's, II. 259, pi. 15, f. 5. 

 Piq>a mode&ta, GOULD, Invertebrata, 188) f. 119. 



DESCRIPTION. 



ANIMAL. Head and back deep cherry-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 

 rounded. 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- 



