WORMS. TESTACEA. 37. Solen. 147 



JBi'it. Zool, t, 44. /". 19. Donovan t. ic8. 



Shell not an inch long, shaped like a piftachia nut, with a large 

 oval gape opposite the hinge, concentrically striate, fometimes 

 \vith yellowLsli rays, sloping at the anterior end, \vhite within: 

 beak near one end. 



182. M. ineqtiivalvia. Somewhat triangular, strong j white, 

 with the under- valve much larger. 



ALontnep.a8. Walk. min. S/uth.f. 35'.' Cardium. 



Shell A lines wide, thick, opake, tranfvericly striate, often co- 

 vered with a hroviii skin ; the upper-valve not half the size of the 

 other and ohfciuelv striate, the under-valve deep : beak central, 

 very prominent: tooili strong, erect, slightly recurved, without 

 lateral-ones. 



183. M. suborbicularis. Nearly orbicular, yellowish-white: 

 in one valve a single tooth locking into a double one: 

 in the other, with a laminate tooth in each vahe be- 

 hind the beak. 



Monte, a ue British Shells, p. 39. n. 8. 



Shell 4 lines long, and about 5 broad, fo me what pellucid, often 

 covered with a brown skin, faintly striate tranl'vcrfely : beak fmall, 

 pointed, turning to OIK: side ; valves clofed. 



184. M. dedivis. Ova!,, thin, brittle, suddenly sloping 

 near the gaping end : valves with each a broad tooth- 

 like plate projecting inwards. 



Donovan, t. 82. Montague p. 48. . 9. M. pubefcens. 



Shell about 2 inches broad, i and a quarter long, whitish, trun- 

 cate at the finaller end, slightly striate concentrically, one valve 

 turning up behind the slope and embracing the edge of the 

 other : beak nearly central, turning a little sideways. 



185. M. prcetenuis. Oval, flat, thin, brittle, a little gap- 

 ing : valves with a single tooth in each, hollowed in 

 the mid-Jdle y projecting horizontally inwards, and 

 closing over each other. 



Montague Brit. Shells, tal. \. f. 2. Donovan, t. 176. 



Shell an inch broad, half as much long, whitish, with a few con- 

 centric striae, riot truncate : beak fmall, pointed, turning to one 

 side, nearly central. 



186. M. difilorta. Oval, thin, brittle, convex, rugged, 

 distorted : valves with a broad subtriangular tooth 

 in each, hollo wed in the middle, projecting hori- 

 zontally inwards. 



Montague Brit. Shells, p. 42. tab. i.Jig. i. 



Shell an inch broad, nearly as much long, oval more or Icfs in- 

 dining to orbicular, white, indented at the margin and variously 

 distorted, not truncate: beak projecting, nearly central, not turn- 

 ing to one side. 



181. M. bidentata. Suboval, thin, compressed, smooth : 

 hinge with 2 broad erect laminate teedi in one valve 

 standing obliquely, and none in the other. 



Montague Brit. Shells, p. 44. 



Shell the eighth of an inch long, rather more broad, dirty white, 

 without striae : beak fmall, near one end, a little reclined* teeth ra-' 

 ther distant from each other, with a fmali hollow between them. 



37. SOLEN. Razor-sheath. 

 188. S. SUiyua. Linear, straight : hinge with a single 



N. a.. 



