134 Zoological Society. 



** Margin very wide in front. 



M. Blainvillii. Ch. Blainvillii, Sow. C. III. f. 6. Inner Lobos 

 Island. 



10. Katharina. 



K. tunicata. Chiton tunicatus, Wood, Conch, ii. t. 2. f. 1 ; Cat. 

 t. 1. f. 10. Wood's specimen is now in the British Museum. 



K. Douglasise. Ch. tunicatus, Sow. C.Illust. f. 152. California. 



11. Cryptochiton. 



The gill only occupies the hinder part of the sides. 



C amiculatus. Ch. amiculatus, Pallas, Nov. Comm. Petrop. ii. 241 . 

 t. 7. f. 26, 30 ; Sow. Tank. Cat. (spec. Brit. Mus.) ; Wood, Cat. t. 1. 

 f. 12, inner side of shell ; Sow. Conch. Illust. f. 80, half-grown. Chi- 

 ton Sitkensis, Reeve's Conch. Icon. i. 55, adult. Kurile Islands. 



12. Cryptoconchus, " Blainv." Stoainson; Gray, Syn. 



Body oblong, rather convex ; back flattish or concave in the centre, 

 with the tuft of spines on the upper part of the sides of the back. 

 The gills extend about half the length of the sides. 



Cryptoconchus porosus, "Blainv.," Burrows, Elem. Conch. 190 

 (1815), spec. Brit. Mus. Chiton porosus, Burrows, E. C. t. 28; 

 Wood, Cat. t. 1. f. 39. Ch. Leachii, Blainv. D. S. N. 554, spec. Brit. 

 Mus. Ch. monticularis, Quoy, Voy. Astrol. t. 73. f. 30, 34, 36, and 

 lower fig. 7 ; Sow. Conch. Illust. f. 129, valves. New Zealand. 



13. Amicula, Gray, Syn. 1840. 



Body ovate, convex ; back convex ; mantle bristly. 



Amicula vestita. Chiton vestitus, Sow. Zool. Journ. iv. 368 ; Sow. 

 Conch. Illust. f. 128. Ch. Emersonii, Couthoy. Atlantic Ocean. 



14. Acanthochites, Leach, B.M. ; Gray, Syn. 



Acanthochites, "Leach." Acan thochitus, Risso. Phakellopleura, 

 Guild., Swainson. Chitonellus (part.), Guild. Acanthochiton, Herrm. 



Body oblong, elongate, rather depressed ; mantle spinulose ; tuft 

 of spines generally large ; gill extending about two-thirds the length 

 of the sides. 



M. De Blainville says, the valves of this genus are always without 

 any trace of lateral area (D. S. N. xxxvi. 537), but this must have 

 arisen from his only having examined worn specimens. 



A. fascicularis. Ch. fasc, Linn. C. echinites, Blainv., Sow. Conch. 

 III. f. 87—93. 



A. Garnoti. Ch. Garnoti, Blainv. D. S. N. 552 ? ; Quoy, Voy. 

 Astrol. t. 73. f. 9, 14. Asc. Zelandica, Quoy, Voy. Astrol. t. 73. f. 5. 

 A. Hookeri, Gray, Dieffenbach, 262. 



A. polychetus. Ch. polychetus, Blainv. 553. 



A. roseus. Ch. roseus, Blainv. 553. 



A. Lesueurii. Ch. Lesueurii, Blainv. 553. 



A. scaber. Ch. scaber, Blainv. 553. 



