240 VENUS. 



18. Venus granulata. Granulated Venus. 

 Lister, pi. 838. f. 175 Donovan, pi. 83. 



Shell thick, convex, strongly ribbed both longitudinally 

 and transversely, giving the surface a distinctly granulated 

 appearance, white variegated with chocolate-brown spots and 

 streaks; inside dark glossy purple, with the margin notched: 

 beaks turning much to one side, with an oval heart-shaped 

 depression under them ; the cartilage slope with generally 

 a few dark transverse lines : length seven-eighths of an 

 inch ; breadth an inch. 



Western coasts, and North Britain : very rare. 



19. Venus deflorata. Fading .Venus. 



Lister, pi. 425. f. 273-Pe?mant, pi. 60, lower % 

 Montagu, pi. 3. f. 4. 



Shell oblong, somewhat oval, thiii, semitransparent, of 

 a whitish color tinged or faintly radiate with purple, marked 

 with longitudinal waved stria?, and crossed by a few trans- 

 verse wrinkles, giving it a net-like appearance, especially 

 at the cartilage end ; inside purplish, with the rays often, 

 visible, and the margin notched : beaks a little on one side, 

 not much produced nor reclined : hinge with two teeth in 

 each valve, one of them large, the other extremely small : 

 length an inch ; breadth an inch and three-quarters. 



Western coasts : very rare. v. m. 



B. Somewhat orbicular, 20 to 25. 



20. Venus Tigerina. Lenticular Venus. 



Lister, pi. 337. f. 174 Montagu, pi. 4. f. I Linn. 

 Trans, viii. pi. 2. f. 5 Dorset Cat. pi. 1. f. 14. 



Shell nearly orbicular, thin, fiat, white with sometimes 

 a purplish tinge on the edges, striate longitudinally, and 

 crossed by numerous fine transverse lines ; inside smooth, 

 glossy wiiite, with the margin plain : beaks small, pointed,, 

 turning a little to one side: length three-quarters of an: 

 inch ; breadth nearly an inch. 



The younger ones of V. decussata may sometimes be 

 mistaken for this shell, but the angular shape of the carti- 

 lage side in this latter one, and the stronger striae at that 

 end, besides the difference in color, immediately distinguish 



them. 



