166 VENUS. 



Pectunculus membranaceus. Da Costa Brit. Conch, p. 

 193. t. 13. left hand fig. 4. 



Knorr, vi. t. 39. f- 4. Enc. Meth. t. 267. f. 7. 

 Inhabits the African Ocean. Linnceus. Coasts of the Nicobar 



Islands. Chemnitz. West Indies. Humphreys. 

 This species is more strongly striated longitudinally, and is 



rather broader in proportion to its length, than the young 



shells of V. verrucosa, of which it has been considered a 



variety by Solander and Montagu. Born has figured V. 



Tiara under this name. 



subcordata. 16. Shell somewhat heart-shaped, 

 with strong longitudinal striae, and remote 

 elevated transverse ribs. 



Venus subcordata. Montagu Test. p. 121. t. 3. f. 1. Ma- 

 ton and Racket, in Lin. Trans, viii. p. 82. 



Inhabits 



Shell about a quarter of an inch in diameter, thick, white, with 



strong lougitudinal costated striae, and remote transverse ridges ; 



the umbones are placed nearest to one end, much incurvated, 



and turned a little to one side ; margin slightly crenated. Mr. 



Montagu doubts whether this is really a British species, 



having only once found it among some sand from Falmouth 



Harbour. 



minima. 17. Shell somewhat heart-shaped, rather 

 compressed, very glossy, with broad trans- 

 verse striae, and two red streaks at the 

 margin. 

 Venus minima. Montagu Test. p. 121. t. 3. f. 3. Maton 

 and Racket, in Lin. Trans, viii. p. 81. 

 Inhabits Falmouth Harbour. Montagu. 

 Shell about a quarter of an inch in length, and rather more in 

 breadth, flesh-coloured, with two white lines, extending like 

 the letter V half way from the umbones, and connected 

 with the margin by a red streak diverging outwards. Mr. 

 Montagu says, the red streaks are constant, but that the 

 white lines are sometimes wanting. 



sulcata. 18. Shell somewhat triangular, with 

 transverse ribs becoming obsolete towards 

 the umbones, and the depression oblong-oval ; 

 margin crenulated. 



