WORMS. TESTACEA. 35. Pholas. 145 



more pointed, the sides of the dorfal-one compresjea and brought 

 to a fine carinate edge down the middle. 



167. L. fasdcularis. With 5 valves, striate ; dorsal valv6 

 much spread out and forming a sharp prominent an- 

 gle at the base. 



Ellis. Zooph. p. \gi.t. is-/. 6. Donovan t. 164. 



Shell with the upper-valves pointed and turning back at the tip, 

 a little convex in front; the dorfal-valve dilated at the bale intd 

 an acute angle. 



168. L. sulcata. With 5 valves, strongly ribbed ; dorsal- 

 valve, somewhat compressed, longitudinally gtriiitc, 

 with a smooth slightly carinate edge. 



Montague Brit. Shells. p. 17. tab. i.fig. 6. 



Shell about a quarter of an inch long, dirty white, nearly trian- 

 gular : lower -i' (lives with 15 strong ribs ; upper-ones pointed at 

 top, narrowing to a point downwards, with 7 or 8 ribs and fmaller 

 intermediate-ones : peduncle short, dusky. 



169. L. Scalpellum. With n valves, roughish ; dorsal- 

 valve compressed, running into a sharp process about 

 half way up. 



Montague p. 18. t. \.f. 4. Donovan Shells, t. i66.f. i. 



Shell 6 lines long, light brown, not striate, covered with short 

 liatrs, much comprefsed, obliquely truncate at top : valves re- 

 fembling fcai&s, 6 each side; dorfal-one rounded at the edge at the 

 bafe : peduncle very short, annulate, hairy. 



35. PHOLAS. 



170. Ph. Dactylus. Oblong, rough, with reticulate murt- 

 cate stria? on the anterior end; hinge reflected form- 

 ing several cells at the back. 



Br. Zocl. t. 39-/. 10. Donovan Shells t. 118. 



Shell more than an inch long, above 3 broad, white, thin, brittle, a 

 little reticulate, ending in a beak forming a large gape, with 4 ac- 

 cessory valves. 



171. Ph. parva. Ovate, rough, reticulate, muricate at 

 the anterior end : hinge reflected, without cells . 



Sr. Zoo!, t. 40./. 13. Montague Shells t. i.f. 7. 8. 



Shell half an inch long, an inch broad, ending in a kind of beak 

 at. the larger end, with a single plate at the back but none below 

 the hinge : tteth slender, curved, with a knob at the bafe. 



172. Ph. crispata. Somewhat oval, reticulate on the an- 

 terior half and separated from the plain half by a 

 broad furrow down the middle. 



Br. Zool iv. t. 40. f. 12. Donov. t. 62. 69. 



Shell nearly 2 inches long, 3 broad, gibbons, whitish, obtufe, very 

 open at both ends, striate tranfverfely : hinge reflected, fmooth : 

 teeth long, curved, without the knob at the baie. 



173. Ph. Candida. Oblong, muricate on all parts with de- 

 cussate striae : one valve with an additional tooth- 

 like process. 



Br. Zool. iv. t. 39. /. 11. Donovan Shells t. 132. 



Sh'll near an inch long, an inch and a half broad, thin, brittle, 

 whitish, slightly muricate at the larger end, with an accessory 

 valve at the hinge : hinge reflected, fmooth : teeth slender, incurved, 

 with, aa erect procefs in one valve on the margin above the 

 tbottt. 



N 



