ACANTHOCHITES. 13 



de Conch. 1852, p. 71, WEINKAUFF, /. c., 1862, p. 333, et al Chiton 

 crlnitus Sows., Conch. Illustr., p. 2, f. 88, 88a, 93. THORPE, Brit. 

 Mar. Couch., p. 251, 1844 ; not of Pennant. Anisochiton discrepans 

 BUQ. DAUTZ. & DOLLF., Moll. Rouss. i, p. 505, t. 61, f. 21-25 ; t. 62, 

 f. 7. ? Acanthochites commwiis Risso, Hist. Nat. de TEur. Merid., 

 iv, p. 269. 



Smith (P. Z. S. 1891, p. 392) reports this species from Aden, and 

 remarks that he cannot separate 0. scutiger Ad. & Rv., Corean 

 Archipelago, and C. carinatus A. Ad. & Ang. from Port Jackson, 

 from this species. 



A. discrepans is readily distinguished from A. fascicularis by its 

 larger size, the much smaller, more numerous and round instead of 

 oval granules ; the less conspicuous tufts, etc. 



A. ADANSONI Rochebrune. PL 8, figs. 33, 34. 



Shell elongated, whitish-violaceous, with black and green spots; 

 anterior valve semilunar ; posterior valve small ; intermediate valves 

 triangular, nearly concealed, closely and very minutely squamulose ; 

 anterior areas of valves narrow, very smooth and longitudinally strio- 

 late ; marginal ligament wide, pilose, hairs coarctate, generally red- 

 dish, and with 9 bunches of glossy, roseate, slightly yellowish bristles. 



Length 20, breadth 8 mill. (Rocliebr.} 



Strait of Santiago ; Saint Vincent, Cope Verde Archipelago ; 

 Goree and Dojcar, West Africa. 



Acanthochites adansoni ROCHEBR., Journ. de Conchyl. (3) xxi, 

 p. 44 (1881); Bull. Soc. Philomath, de Paris, 1880-'81, p. 116; 

 Nouv. Arch, du Mus. (2), iv, p. 238, t. 17, f. 9a, b.Kalison 

 ADANSON, Voy. au Senegal, pt. 2, p. 42, t. 2. f. 11 (young individual, 

 teste Rochebr.) 



The posterior valve is excessively narrow, rounded, almost entirely 

 covered by the girdle ; median valves triangular, carinated, the 

 carina obtuse, covered with ovoid scales regularly arranged in 

 radiating lines ; middle of the valves narrow, very finely striated 

 longitudinally. (Rochebr?) 



The notes given under A. bouvieri on Rochebrune's figures of that 

 species, apply also to this. They are false in most particulars. 



A. BOUVIERI Rochebrune. PI. 3, figs. 65, 66. 



Shell elliptical, carinated, black. Anterior valve elongated ; pos- 

 terior valve rounded ; median valves triangular, wide, beaked, 

 covered with minute points ; anterior area very narrow, transversely 



