148 WORMS. TESTACEA. 37. Solcn. 



tooth in one valve, and a lateral lamina; in the other 

 valve two, with a lateral inclined lamina. 



Br. Zoo/, t. 45. /. 20. Donovan, t. 46. Da Cost. t. 17. /. 5. 



She/lam inch long, 8 broad, truncate at one end, a little rounded 

 at the other, olive-brown, grey with purplish bands when worn, 

 divided diagonally by a conoid cinereous mark, one part striate 

 longitudinally the other tranfverfely -.hinge near one end. 



189. S. Novacula. Linear, straight: hinge with a strong 

 obtuse curved tooth in each valve, without lateral 

 laminag. 



Montague Brit. She/Is, p. 47. 



Shell refembling S. Siliqua, except in the teeth. 



190. S. Ensis. Linear, a little bowed : hinge with a; 

 single tooth and lateral lamina in one valve, locking 

 into two teeth and a double lamina in the other. 



Br. Zool. t, 45./. 22. Donovan t. 50. Lister t. 411./. 257. 



Shell hardly an inch long, about 5 broad, coloured divided and 

 striate like S. Siliqua, truncate and a little rounded at both ends : 

 hinge at one end. 



191. S. Vagina. Linear, straight, a little reflected at the 

 end next the hinge : in each valve a single compres- 

 sed tooth without laminae. 



Br. Zool. t. ^6.f. 21. Donovan, t. 110. Barbut t. <z.f. 4. 



Shell 3 quarters of an inch long, about 4 broad, orange-yellow, 

 striate longitudinally, rather truncate at both ends: hinge clofe to 

 one end. 



192. S. pellucidus. Oblong, slightly bowed, pellucid : hinge 

 with a single tooth in one valve locking into 2 in the 

 other, with a lateral lamina in each. 



Brit. Zoo!, t. 46./. 23. Donovan. 1. 153. 



Shell a quarter of an inch long, about an inch broad, thin, brittle, 

 covered with a greenish skin, rounded at each end. 



193. S. Legumen. Straight, linear-oblong: hinge near 

 the middle, with a single tooth in one valve, and 2 in 

 the other, and a hook-like process in each, pointing 

 towards the cartilage. 



Br. Zooi. t. 46./. 24. Donovan t. 53. 



Shell nearly an inch long and 3 broad, thin, white or covered 

 with a yellowish skin, rounded at both ends, radiate from the 

 hinge to the margin. 



191. S. antiquatus. Oblong, a little contracted opposite 

 the hinge: hinge central, a single subulate tooth in one 

 valve, locking between two in the other. 



Donov. t. 114. Br. Zool. t. 46./. 25. S. Cultellus. 



Shell near an inch long, 2 broad, thin, white or covered with a 

 yellowish-brown skin, femitranfparent, concentrically striate, 

 rounded at the ends : teeth projecting beyond the margin, in one 

 valve a single fubulate one, in the other two, one of which is tubu- 

 late, the other broad. 



195. S. minutus. Suboval, transversely wrinkled : valves 

 with each 2 rows of concave spines running from the 

 beak. 



Montague. Brit. Shells, t.x.f. 4. Chemn. conch. 6. t. 6./. 51. 52. 



Shell a quarter of an inch long, half an inch broad, whitish, trun- 

 cate clofe to the hinge, with generally dissimilar valves. 



196. S. vespertinus. Oval-oblong with pale purple rays : 



