WQKMS. TESTACEA. 33. Balauas. 143 



loO. Ch. cincreus. With 8 valves, nearly smooth, oval, 

 carinate, beaked on the back, slightly ciliate on the 

 margin 



Chemn, Conch. 8. tab. 96. /. 818. Mont. Shells, p. 3. 



Shell a quarter of an inch long, cinereous, reddish when alive, 

 comprefsed, a little reflected on the hinder angle at the bafe, with 

 a rather broad margin. 



151. Ch. albus. With 8 valves, smooth, oval, not cari- 

 nate ; the first valve notched on ihe hind-part. 



Barbnt. t. i.f. i. Chemn. Conch. 8. t. 96. /. 817. 

 Shell less than the lait, pure white. 



152. Ch. J'uscicu'tirij. With 8 v 7 alves, nearly smooth, 

 slightly carinate, surrounded at the margin with tufts 

 of hairs. 



Chemn. Conch. 10. t. 173. /. 1688. Moxtag. Shells. p. 5. 

 Shell cinereous, slightly carinate. 



153. Ch. crinitus. With 7 valves, thickly clothed with 

 short hairs. 



About 6 lines long. Br. Zool. iv. t. 36. /. i. 



It is probable that thcfe hairs are a fpecies of marine Conferva. 



154. Ch. discors. W 7 ith.7 valves, curjiafe, strongly beaked; 

 the 5 middle-valves divided transversely from the an- 

 terior base to the beak 



Salcomb iiay. Montague Brit. Shells. p. 3. n. 3. 



Shell half an inch long, oblong : values finooth or faintly striate 

 on the upper-part, very fine shagreen on the lower, the end-ones 

 rufous-brown, the rest dark cinereous: beaks frequently rufous: 

 margin moderately broad, faintly reticulate. 



33. BALANUS. Acorn-shell. 



155. B. communis. Conic, ribbed : lid of 4 valves, stri- 

 ate transversely, with a longitudinal groove on the 2 

 longest. 



Br. Zool. t. 37. /. 4, Donovan, t. 30. /. i . 



Shell fometiuies an inch in diameter, and nearly 3 quarters high, 

 grey-brown, rugged, compofed of about 6 valves : lid pointed. 



156. B. batanoidei. Somewhat conic, smooth, ribbed : lid 

 of 4 valves; the 2 upper-slightly striate transversely, 

 the other smooth. 



Br. Zool. t. 37. /. 5. Donovan, t. 36. /. 2. 3. Da Cost. t. 17. /. 7. 



Shell half the size of the former, fometimes much depressed and 

 dilated at the bafe, white, fmooth, often deeply grooved at the 

 bafe, of 6 valves divided by a deep furrow : lid more obtufe. 



157: B. punctatus. Slightly conic, rugged, ribbed : lid 4- 

 valved, the upper longitudinally striate, the edges of 

 the upper and lower closely united at top, indented, 

 and locking into each other. 



Devonshire. Montague Brit. Shells, tab. i.f. 4. 



Shell about a quarter of an inch broad, and not much higher, dull 

 brown, very rugged, obtufely ribbed: lid of 4 valves, the upp^r- 

 one with a few longitudinal ridges, the rest punctured. 



158. B. rugosus. Nearly cylindrical, grooved; lid of 4 

 rough angular erect valves, forming 4 distinct slightly 

 reflected points. 



Lepas boreaUs. Donovan Brit* Shells, tab. 166. 



