CHIEFLY OF THE UNITED STATES. 177 



Remarhs. — This is a very small species, which appears to be very. numerous. It 

 is near to P. aurea, described by me from Virginia, and is near to P. Troostiana, also 

 described by me from near Nashville, Tenn. It ajoproaches in size and somewhat in 

 form to P. fontana, Hald., but is more elongate than either of the species. The 

 aperture is longer in proportion, being nearly three-fourths the length of the shell. 

 It is not thickened at the edge of the lip like the two first, but it has within the edge 



a brown line which the fontana has not. 



* 



Physa parva. pi, 24, fig. 104. 



Testa fusifqrmi, subconstricta, diaphana, polita, pertenui, tenebroso-cornea ; spira exserta, acuminata ; 

 suturis impressis ; anfractibus quateruis, convexiusculis, ultimo grandi ; apertura parviuscula, con- 

 stricta; labro subexpanso, margins acuto ; columella impressa, vix pHoata. 



Shell fusiform, somewhat constricted, transparent, polished, very thin, dark horn- 

 color ; spire exserted, pointed ; sutures impressed ; whorls four, a little convex, the 

 last one large ; aperture rather small, constricted ; outer lip somewhat expanded, 

 with an acute margin ; columella impressed, scarcely folded. 

 Proc. Acad. Nat. Sci., 1864, p. 115. 



Hah. — Verdigris River and Rock Creek, Kansas, F. Hawn, Civil Engineer. 



My cabinet. 

 Diam. -11, Length -19 inch. 



Remarks. — This is a very small species, about the size oihordacea, herein de- 

 scribed, and nearly the same color. It is, however, very diiFerent in form, and has 

 not the colored edge of the outer lip. It might be supposed to be the young of the 

 same described species, but it has the appearance of being mature, having four 

 whorls. There were ten specimens from the two habitats. The aperture is nearly 

 two-thirds the length of the shell. 



'&"• 



SUCCINEA WlLSONII. PI. 24, fig. 105. 



Testa elongato-obliqua, valde striata, diaphana, peraurea, subnitida, tenui ; spira valde exserta ; suturis 

 valde impressis ; anfractibus quaternis, convexiusculis ; apertura grandiuscula, ovata ; labro subex- 

 panso ; columella tenui, ineurva et contorta. 



Shell obliquely elongate, very much striate, transparent, deep golden color, and 

 somewhat shining and thin ; spire very much exserted ; sutures much impressed ; 

 whorls four, slightly convex ; aperture somewhat large, ovate ; outer lip somewhat 

 expanded ; columella thin, incurved and twisted. 

 Proc. Acad. Nat. Sci., 1864, p. 109. 

 Hah. — Near Darien, Georgia, S. W, "Wilson, M. D. 

 My cabinet and cabinet of Dr. Wilson. 



45 



