ACANTHOCHITES. 15 



Chiton garnoti Blainv., Diet. Sc. Nat. xxxvi, p. 552 (1825). — 

 QuOY & Gaimard, Voy. de I'Astrol. Zool. iii, p. 401, t. 73, f. 9-14. 

 — Lam., An. s. Vert., vii, p. 517. — Keauss, Die Siiclafrik. IMoll., 

 p. 42. — ? Chiton danielli SowB., Couch. Illustr., p. 7, f. 48. 



The valves are more or less encrusted or eroded in most adult 

 adult specimens. The Ch. danielli of Sowerby, figured in the Con- 

 chological Illustrations, but never described, has been considered 

 synonymous on account of its locality; but as Krauss has pointed 

 out, the figure represents that species with an additional pair of well 

 developed tufts behind the tail-valve. It may prove distinct ; but 

 as the figure was drawn from a badly eroded example and in other 

 respects agrees well with garnoti, it may be left here for the present. 



A. penicillatus diflfers from this species in both coloring and 

 sculpture, v. Martens reports garnoti from Mauritius and Reunion 

 (Mobius' Reise, p. 300.) 



A. PENICILLATUS Deshaycs. 'PL 4, fig. 84 ; pi. 8, figs. 29, 30. 



Shell elongated, moderately elevated, carinated, the side-slopes 

 nearly straight. Surface lusterless, varying from uniform cream- 

 white to heavily blotched and maculated with blackish. 



Median valves slightly beaked. Dorsal areas not elevated at the 

 edges, rather narrow, closely and finely longitudinally striated. 

 Latero-pleural areas covered with rather coarse, flat or subconcave 

 scale-like granules, varying from drop-shaped to angularly oblong 

 in form, arranged in radiating rows, and less obviously in serie 

 parallel to the outer-anterior contours of the tegmentum (fig. 81). 

 Posterior valve having the tegmentum small, round, and equal in 

 length and breadth, the mucro moderately elevated and ?iear the j)os- 

 terior margin. 



Interior white ; sinus broad and angular. Slits of side insertion- 

 plates posterior and small. Posterior valve having a slight upward 

 wave behind, at each side of which there is a projection or angle ; 

 the plate straight or concave from this angle to the lateral angles. 

 Slits as usual. Girdle covered with short pile, having a rather 

 small bunch of white spicules at each suture, four bunches around 

 the head valve, and a fringe of similar long glassy spicules at the 

 periphery. 



Length 22, breadth 11 mill. ; divergence 110°. 



Reunion (Desh.) ; Mauritius (V. Robillard.) 



Chiton penicillatus Desh., Moll. Reunion, p. 41, t. 6, f 8-10 (1863). 

 — Acanthochcetes p.. Martens in Beitriige zur ^leeresfauna der 



