WORMS.. TESTACE A. 33- Balanus. 143 



150. Ch. cinereus. With 8 valves, nearly smooth, oval, 

 carinate, beaked oh 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 S valves, smooth, oval, not cari- 

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



Barbut.t. i.f. 1. Chemn. Conch. 8. t. 96./. 817. 

 Shell less than the laft, pure white. 



152. Ch. fascicularis. With 8 valves, nearly smooth, 

 slightly carinate, surrounded at the margin with tufts 

 of hairs. 



Chemn. Conch. 10. t. 173./. r688. Montag. 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. /. 1. 



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



154. Ch. discors. With! valves, carinate, strongly beaked; 

 the 5 middle-valves divided transversely from the an- 

 terior base to the beak. 



Salcdmb Bay. Montague Brit. She/Is. p. 3. n. 3. 



Shell half an inch long, oblong : valves fmooth or faintly striate 

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

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

 margin moderately broad, faintly reticulate. 



S3. 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./. 1 . 



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

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



156. B. balanoide*. Somewhat conic, smooth, ribbed : lid 

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

 the other smooth. 



Br. Zool. t. 27./. 5. Donovan, t. 36./. 2. 3. Da Cost. U 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 ©btufe. 



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. \.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 upper- 

 one with a few longitudinal ridges, the rest punctured. 



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

 rough angular erect valves, forming 4 distinct slightly 



I reflected points. 

 -Xepas borealis. Donovan Brit, Shells, tab. i6o» 



