156 WORMS. TESTACEA. 41. 42. 



41. DOxVAX^ 



250. D. Trunculus. Oblong, glossy, finely striate longi- 

 tudinally, with transverse purple bands, within purple 

 with crenate margins. 



Br. Zoo/, t. 55. f. 45. Donovan, t. 29. /. 1. 



Shell 6 lines long, an inch and a quarter broad, yellowish with 

 brown and purple bands : beak fmall, near the abrupt end, 



251. D. denticulata. Somewhat wedge-form, strong, 

 thick, much truncate at one end, longitudinally stri- 

 ate with the interstices punctured, denticulate on the 

 margin. 



Br. Zool. t. 55./. 46. Donovan tab. 24. D. crenulata. 



Shell -j lines long, an inch broad, brown yellowish or purple, 

 variously banded and rayed, much sloped at the larger end, purple 

 within : beak nearer the larger end : hinge with a lateral tooth 

 each side the middle-ones. 



'252. I), complanaia. Oblong, smooth, glossy, yellowish 

 with white streaks or spots, and a broad white ray 

 from the beak to the margin. 



Montague t. 5./. 4. Lister t. 384./". 227. 



Shell 6 lines long, an inch and a quarter broad, yellowish or pur- 

 plish, often covered with a polished skin, rarely with a few obfo- 

 lete tranfverfe striae, within purple with the margin fmooth ; 

 beak near one end. 



253. D. plebeia. Oblong, suboyal, thick, smooth, gloss}-, 

 yellowish horn-colour with 2 brown rays from the 

 beak : teeth both strong. 



Montague. Brit. Shells, p. 107. t. 5, /. 2. 



Shell about half an inch long, 3 quarters broad, strong, with a 

 few distant concentric striae, pale and glofsy within, the margin 

 smooth : beak nearer one end : hinge with a lateral tooth. 



254. D. castanea. Strong, thick, with a few irregular 

 transverse ridges, chesnut with a darker curved ray 

 from the beak : one of the teeth small. 



Montague Brit. Shells, app. p. 573. t. 17./. 2. 



Shell a quarter of an inch long, 3 eighths broad, chesnut and glofsy 

 within with the margin smooth : beak obtuse, rather leaning to the 

 longer side : hinge with a large and a small tooth in each valve, 

 without lateral-ones. 



*255. D. Irits. Sub- oval, whitish, with transverse waved 

 membranaceous reflected ridges finely striate longitu- 

 dinally between the interstices. 



Donovan f. 29. f. 2. Da Costa t. 15./. 6. 



Shell about the size of a fmall kidney-bean, fometimes nearly cir- 

 cular or oblong, opake, rugged, within white or flesh-colour with 

 the margin fmooth : beak fmall, oblique : teeth cloven, one 

 excepted. 



42. VENUS. 

 256. V.fasciata. Somewhat heart-shaped, with large 

 broad depressed ridges of equal thickness at both 

 ends : beaks much curved. 



Donovan t. 170. Da Costa tab 13./. 3. 



Shell 10 lines long, an inch broad, variously rayed and banded 

 with brown red or yellow, refembles V. Paphia, but is more 

 rounded, and the ridges arc more flattened and not growing obfo- 



