WORMS. TEStACEA. 42. Venus. 15? 



lets towards the extremities : beak central, with a heart-shape* 

 depression beneath it. 



25T. V. verrucosa. Suborbicular, convex, with strong rai- 

 sed ridges forming membranous protuberances to- 

 wards the Outer margin which is crenulate. 



Donov. t. 44. Br. Zool. t. 54./. 48. Da Cost. t. 12./. 1. 



Shell about 2 inches long and as much broad, dirty-white with 

 •often a rufous tinge, within white, fmooth, crenulate at the 

 margin, rugged with wrinkled knobs at the sides, in the young 

 shell. fome.tji.mes faintly striate longitudinally, Donov. t. 115 : beak 

 central. curyed> beneath which is a heart-shaped depression. 



258. V. Galiina. Somewhat heart-shaped, with obtuse 

 recurved, concentric striae and 3 or 4 rufous-browu 

 stripes from the beak : rtind-tOofrh minute. 



Br. Zool. U &./-. 50. Donov. t. 68. Linn. Tr. vi. t. \j.f. 7. 8v 



Shell about an inch long, one and a quarter broad, fometirnes 

 whitish browrt and plain, often witrt rufous fpots, but moft com- 

 monly with 3 or 4 brpad stripes which are ufually marked with 

 2igzag darker line§» within white with a crenulate margin : beak 

 curved), with a heart-shaped depression under it. 



259» V. islandica. Suborbicular, convex, strong, irregu- 

 larly striate, covered with a brown skin, within pure 

 white : beak without the depression under it. 



Donov. t. 77. ' Br. Zool. t. 53./. 47. Da Costa t. 14./. 5. 



Shell 3 Inches 3 quarters long, 4 and a quarter broad, whitish co- 

 vered with aglossy yelloWi-brown skin, within white with a plain 

 margin x-btak curved to one side: teeth 3, the middle-one double, 

 the lateral-one linear oblique, crenulate. 



260. V* Chione. Somewhat hearted, strong, faintly wrin- 

 kled, covered with a smooth glossy chesnut skin, with 

 faint darker rays. - 



Donovan t. 17.. Da Costa t. 14./"% 7. 



Shell 3 inches long, near 4 broad, witfun glossy-white, with a 

 plain margin i.jbeak .oblique, turned sideways^ with a heart-shaped 

 depression beneath it: teeth 4, the 2 middle-ones approximate and 

 lanceolate, the 2 lateral-ones divaricate. : ' 



261. V. exoleta. Orbicular, strong* with regular close- 

 set stria?, generally pale with obsolete brqacl rays* 



Br. Zool. t. 54./. 49. t. 66'.'/. 49. Donovan t. 42./. 1. 



Shell 2 inches -wide, fometimes white and plain, oftener with 

 broad or narrower pale rays, within fmooth white with a plain 

 margin: beak curved, with a short heart-shaped depression 

 . imder .it* . ..." ' 



262. V. uiidata. Orbicular* thin* convex, with fine irre- 

 gular striae 5 the margin undulate. 



Br. Zool, t. 55./. 51. * Donov. t. 121. Li am Tr. vi. t. 17. f. 17. 18. 



Shell an inch and quarter broad, a little more in length, white 

 with a yellowish tinge, within glossy with a plain margin: beak 

 a little enrvedj without depression under iu 



263. V. Casirid* Suborbicular, with transverse acute re- 

 curved ridges, crenulate on the hind-margin, slightly 

 channelled behind the Repression. 



Linn. Trans, viii. t. 2./. 1. Br. Zool.t. 54./. 48. A. 



Shell an inch and a half wide, refembjing V. verrucofa, but the 

 ridges are more a'cute> and do not form protuberant knobs at the 

 outer margin, white with arigular brownish lines : plaits broader 

 •or narrower; nearly uniting : hinge thick. 



264. V. lactea. Orbicular, thick, flattisb, with regular 



o 



