221 
Guppy Reprint 
73 
Page 
PAPER No. 6 
ON NEW SPECIES OF BIVAL VE MOLLUSKA FOUND 
AT CUA/ANA, VENEZUELA. 
Paper presented to the Scientific Association of Trinidad, 
Dec. lo, 1873 and published in yoI. 2 of the “Proceedings,” 
pp. 90-2, with plate 3. 
One of the shells now to be described is a large and fine 
species of Venus. Specimens of this have been in my cabi- 
net more than four years ; but although it appeared to me 
unlikeh" that so large and handsome a shell should have 
escaped notice, yet I have not been able to find anything 
published relating to it. The species is certainly allied to 
J'. cancellata, but by no means very closely. Its square 
equidistant ribs are not unlike those of V. rugosa, and the 
shape and color may recall V. gallimda, but it mu.st be 
admitted that these re.semblauces are somewhat illusorj'. 
The other shell is a Mactra, not belonging to the typical 
group of that genus, but on the contrary, somewhat of an 
aberrant form. It is a large and interesting species. 
The recent not less than the fossil shell fauna of Cumana 
