10 ACANTHOCHITES. 



Length 25, breadth 11, mill.; divergence 110.° 



Length 15, breadth 7 mill. 



Finmark and Great Britain, south to Mogador ; off the Strait of 

 Gibraltar, (and perhajis the Canaries) ; Mediterranean and Adriatic 

 Seas. On rocks, stones and oyster shells from low tide to 25 fms. 



Chiton fascicularis Linn., Syst. Nat. xii, p. 1106 (1766), and of 

 many authors, including Lam., Payraudeau, Philippi, Wein- 

 KAUFF, Forbes & Hanley, Hist. Brit. Moll., t. 59, f. 5. — Jeffreys, 

 Brit. Conch, iii, p. 211 ; v, p. 197, t. 55, f 3 ; Ann. Mag. Nat. Hist. 

 1870, p. 10; P. Z. S. 1882, p. 666, Woodward, Man. of Moll., t. 

 11, f. 30.— SowB., Conch. Illustr., f. 87, 87a.— Audouin, Ex. PI. 

 Savigny, p. 127; Savigny, pi. 3, f. 5. — Acanthochites fascicularis 

 Sars, Moll. Reg. Arct. Norv., p. 117. — Anisoehiton {Acanthochiton) 

 fascicularis Fischer, Manuel de Conchyl., p. 881, f. 623 (bad). — 

 Anisoehiton {Acanthochites) fascicularis BuQ., Dautz. and Dollf., 

 Moll. Rouss. i, p. 502, t. 61, f. 17-20; t. 62, f 6.— Acanthochites car- 

 inatus Risso, Hist. Nat. Eur. Merid, iv, p. 269 (1826). — Acantho- 

 chcetes vulgaris Leach, Synops. ^loll. Gt. Brit., p. 229 (1852). — 

 Chiton crinitus Pennant, Brit. Zool. iv,p. 71, t. 36, f. 1, Al (1777) ; 

 edition of 1812, vol. iv, p. 142. — Reeve, Conch. Icon., t. 26, f. 176. 

 Not Ch. crinitus Sowb. — ? Chiton glohulosus Chiereghini MS., 

 Brusina's Ipsa Chier. Conch., p. 43, 1870. 



This species is smaller than A. discre-pans and the valves are much 

 more coarsely granulated, the granules being ovate, at least toward 

 the beaks. The median smooth area is wider than in discrepans, 

 and less raised ; the tufts are larger, and the girdle is fringed at the 

 margin. 



Var. attenuata Jeffr. ]\Iuch longer and narrower in proportion to 

 the breadth. England. 



A. .eneus (Risso) Monts. 



This Chiton resembles the other species of the group, but is more 

 arched, reddish or bright colored, having distinct granules, and with 

 the hairs of the tufts copper colored ; border thick and spinous. 

 This beautiful species belongs to the laminarian zone, and has 

 occurred at various points in the Mediterranean. The A. fascicularis 

 is littoral, smaller, black with the keel chalky white ; and moreover 

 its granulations are less numerous and more prominent. A. discre- 

 pans Brown is also littoral, is larger and better known. Its colora- 

 tion is ordinarily greenish, its granules minute and numerous; the 

 hair-tufts are a beautiful silvery green. (Monts.) 



