197 



valva sinistra convexa, ; colore dilute rosea, albo radiato. Long. 1 ; 

 alt. -f ; lat. \ poll. Liberia. Dr. C. J. Bates. 



Resembles T. donacina in shape and coloring, but is larger, and is 

 also distinguished by the triangular area of coarser sculpture on the 

 right valve. 



Nucula [Leda] bicuspidata. T. alba, transverse elongato- 

 ovata, sub-cylindrica, antice rotundata et triplicata, postice producta, 

 triearinata, bicuspidata; valvis oblique concinne striatis, praeter 

 spatio excavato inter carinas serratas; cardine dentibus anticis ad 

 12, posticis ad 26. Long. |; alt. \ poll. Hab. Liberia. Dr. C. J. 

 Bates. 



[iV. Largillierti Phil. (1851) ; Leda plicifera A. Ad. (1856).] 



Nassa turbinea. T. solida, ovata, albida, apice producto ; anfr. 

 9 sub-tabulatis, phcis numerosis acutis et striis volventibus profundis 

 ad 13 decussatis; basi spiraliter striata: apertura parva, stricta, an- 

 gulato-ovalis ; labio acuto, crenulato, intus sulcato ; callo columellari 

 erecto, granulate Long. -^ ; lat. \ poll. Hab. Liberia. Dr. C. J. 

 Bates. 



Nassa elata. T. elongato-conica, cinereo-albida ; anfr. 8 tabu- 

 la! is, marginatis, posterioribus plicatis, penultimo glabro, ultimo antie& 

 striato : ajjertura angusta, ovalis, alba ; labro acuto, antice crenulato, 

 intus striate Long. i| ; lat. T 3 ^ poll. Hab. Liberia. Dr. C. J. Bates. 



Helix hepatizon. T. depresso-conica, crassa, rubro-castanea, 

 canescens, sub-perforata ; anfr. 51 convexis, striis incrementalibus et 

 striis volventibus argute reticulatis; sutura impressa, : apertura semi- 

 circularis, contracta; peristomate incrassato; intus cerasina. Lat. 1 t 3 q 

 alt. £ poll. Found near the mouth of Gaboon River. Dr. C. J. Bates. 



D^= Vol. ii. 53, (July, 1845.) 



Unio paludicolus. T. transversa, ovato-rhomboidea, inequila- 

 terali, antice rotundata ; margine Hgamentali arcuata ; natibus pro- 

 minulis, erosis; epidermide rufo-castauea ; dentibus cardinalibus ob- 

 liquis, pyramidatis; lateralibus lente arcuatis ; margarita cupreo-corus- 

 cante. Long. 1| ; alt. T 9 g poll. Everglades of Florida. J. Bartlett. 



In shape and size closely resembles U. lieterodon. 



Unio papyraceus. T. fragili, valde inequilatcrali, transverse 

 ovato-oblongata, sub-cylindracea ; postice svibrostrata, supra angulat§ ; 

 natibus parvis, eleganter undulatis ; epidermide levigata, luteo-cas- 

 tanea, radiatim Uneolata ; cardine invaHdo ; dente cardinali longitudi- 

 nali, compressa ; laterali tenui, recta ; margarita argentea. Long. 1^; 

 lat. T ^o ; alt. 1 poll. Everglades of Florida. J. Barth it. 



In shape, delicacy, and even its color, it is not unlike Anodunta 

 couperiana Lea. 



