NATURAL SCIENCES OP PHILADELPHIA. Ill 



S. Totteniana. Dr. Binney says this is synonymous with ovalis. Say.* But 

 Dr. Gould properly says it differs in being more fragile, and has 

 a shorter spire. It also differs in color. The interior of all my speci- 

 mens is iridescent, a character I have never seen in ova/is. Mr. W. G. 

 Binney says (v. 4,) he " agrees entirely with Lea and Gould in sepa- 

 rating it from obliqua, Say." 



S. Nuttalliana. Dr. Binney says this is synonymous with ovalis, Gould. Dr. 

 G., however, says this " no doubt is a well-marked species." It cer- 

 tainly is very different from ovalis, Gould, being much more slender, 

 more oblique, and different in color. In fact I believe that Dr. Gould 

 has described the same shell as ruslicana, in his volume of " Expedi- 

 tion Shells, p. 28." 



S. Oregonensis. Dr. Binney says that this "cannot at present be ascer- 

 tained." Dr. Gould says that the specimens famished by Mr. Lea 

 " leave no doubt of being decidedly a well-marked species." Oregon- 

 ensis is perhaps nearest to Wardiana, but that shell has a smoother 

 surface, is greenish, while Oregonensis is yellowish, and in the turns 

 of the spire they differ entirely. 



S. inflata. Dr. Binney makes this synonymous with campestris, Say. Mr. 

 W. G. Binney says be " is inclined to doubt its specific weight." In- 

 flata is smoother, more inflated and more obtuse in the spire, as well 

 as in really having one whorl less. It ought to be retained until more 

 specimens could be examined. This species was founded on a single 

 specimen sent by Dr. Ravenel, who also sent me the true campestris. 



Description of a new Species of PLANQEBIS. 

 BY ISAAC LEA. 



Planorbis Billingsii. Testa, laevi, planulata, superne piano convexa, sub- 

 tus lato umbilicata, estriata ; anfractibus quaternis ; labro acuto ; apertura 

 grandiuscula, subrotunda, obliqua. 



Hab. Ottowa River, Canada West, E. Billings, Esq. 



Descriptions of Thirteen New Species of MELANIDiE of the United States. 



BY ISAAC LEA. 



Goniobasis subrhombica, Testa, subcarinata, subfusiformi, subtenui, tene- 

 broso-oliva, estriata, evittata; spira, obtusa; suturis iinpressis ; anfractibus 

 quinis, planulatis, superne carinatis ; apertura grandi, rhomboidea, intus albida ; 

 labro acuto, vix sinuoso ; columella tenui et aliquanto contorta. 



Hab. Hog Creek, North Georgia, J. Clark. 



Goniobasis fraterna. Testa, carinata, fusiformi, subtenui, lutea, evittata vel 

 quadrivitaia ; spira obtuso-conica, ; suturis valde iinpressis ; anfractibus instar 

 senis, planulatis, superne acuto carinatis ; apertura parviuscula, ovato-rhom- 

 boidea, intus alba ; labro acuto, vix sinuoso ; columella tenui, interne contorta. 



Hab. Bibb Co. and Cahawba River, Alabama. E. R. Showalter, M. D. 



Goniobasis Rom.e. Testa, subcarinata, conoidea, subcrassa, tenebroso-cor- 

 nea, evittata ; spira, subelevata, aliquaoto obtuse elevata ; suturis impressis ; an- 

 fractibus sepfenis, planulatis, superne carinatis; apertura grandiuscula, ovata, 

 intus albida; labro acuto, subsinuoso ; columella tenui et contorta,. 



Hab. Rome, North Georgia, Rev. G. White. 



* At p. 72, v 2, Dr. B. Bays that Totte.ntiawi is " unquestionably the same with obliqua, Bay. 1 ' 

 considering obliqua = ovalis, but the figures of the two last species are very different. 



1864.] 



