WORMS. TESTACEA. 62. Venus. 
227 
Shell tranfverfely l^ate, the back glabrous: anterior flopc 
very broad with brown lines: imprellion behind the 
beaks heart-lhaped with brown lines. 
Schrect. Einl, Conch. 3. p, 200. tab. 
2. With 3 brown rays. Schrat. conch, p. 2oo. n. 140.' 
' Inhabits the Red Hea, refembles the lall, but the knob is blueiib 
and the lliell is white with cinereous lines fpots and marks. 
Shell triangular fmooth truncate each iidc with yellowilh 
rays: ilope heart- fhaped : margin very entire. 
Knorr Vergn. 5. tab, 15. ftg. 2 and 6. t, 10. f. 5* 
Chemn. conch. 6. tab, 3 ^^* 
Inhabits the Atlantic and American Scat: anterior Hope pale 
chefnut with a large gape. 
^‘nuofa. 
^‘'"’na. 
f^’-idita. 
Shell fomewhat triangular thin convex, with a deep obtufe 
indentation in the miildle of the front. 
Donifvan s Britijh Shells, ii. tab. 42. /ig. 2. 
Pennant Brit. Zool. iv. tab, 55. fig. 51. A. 
Found at Weymouth. 
Shell triangular, quite fmooth, olivaceous obfcurely banced; 
within white or blueiih : anterior flope heart-lliaped, 
pollcrior ovate. 
Martin. \. Manigf. I. tab. t.fig. 1.2. 
Chemn. conch. 6. tab. li. fig. 327.-329. 
Inhabits rivers of Guinea ; very rare. 
Shell thick coarfe, with convergent beaks, and crenate teeth in 
the hinge. 
Shell green, within white, witlt tranfvcrfe unequal mem- 
branaceous ftrias : margin acute. 
Rumpf. Muf. tab, i^t./ig . H. 
Chemn, conch. 6. tab, ‘iZ.jig. 236. 
Inhabits rivers of Ceylon : 2 \ inches long and 3 broad ; with an 
oblong gape on the anterior Hope; 2 of the hinge-teeth cleft. 
Shell gibbous fnowy, the anterior part convex and with the 
infide pale violet ; anterior flope roundifli, pofterior 
heart-lhaped : margin very entire. 
Chemn-. conch, 6. tab. 
Inhabits India : on the anterior flope is a large oblong gape .■ 
anterior tooth of the hinge in each valve crenulate. 
Shell thin glabrous convex, white varied with brown pofte- 
rior ilope elongated, with oblique tumid lips : hinge 
with 4 teeth. 
Ff 2 
Gualt, 
