352 Monograph of the Species of 



of the outer lip is such as to render the aperture heart-shaped, 

 and the flexure extends to a considerable distance round 

 towards the back of the shell. Its true dimensions are, 

 length /y inch, breadth {^ inch. 



It lives in damp places, around the borders of ponds, or in 

 rich, moist fields under fragments of board, sticks, &c. Mr. 

 Say found his ovata in Pennsylvania and his modesia in the 

 Northwest Territory. It is common about Boston, and I have 

 received it from near Portsmouth, N. H., from Troy, N. Y., 

 from Worcester County, Md., and from Jacksonsborough, 

 S. C. ; and Professor Adams found it near Middlebury, Vt., 

 and Dr. J. W. Mighels near Pordand, Me. 



The animal is of a dark claret color above, lighter beneath ; 

 tentacles two, remarkably clavate or pestle-shaped ; the front 

 of the foot is trilobate, the central lobe being very small, and 

 there is a constriction behind the two lateral ones. 



PUPA GOULDII. 



PI. XVI. Fig. 9. 



"Testa minuti, ovato- cylindric^, sub-castanca ; anfractibus pluribusqu;im qua- 

 tuor ; apice obtuso ; apertura subcordata, bilobata, dentibus quinque armata ; labro 

 subreflexo." 



^' Animal with two tentacles only, black above ; foot gray, 

 short posteriorly. Shell light chestnut, cylindrical ovate ; 

 whorls between four and five, rather ventricose, the last occu- 

 pying nearly half the length of the axis ; apex obtuse ; aper- 

 ture lateral, composed of two unequal curves, meeting in the 

 centre of the outer lip, with five prominent white teeth, viz. : 

 one upon the transverse margin, two upon the umbilical mar- 

 gin, and two upon the labial margin ; lip thickened, not re- 

 flected ; umbilicus a little open." (Binney, in Proceedings 

 of the Boston Sac. Nat. History, p. 105, March 15, 1843.) 



This very distinct species is unusually constant in its char- 

 acters. Its shape may be more properly called elliptical. In 

 size it is intermediate between P. ovata and P. milium, ap- 

 proaching more nearly to the latter in form and color. In 

 adult specimens I have never found any variation in the num- 



