200 TONICIA. 



I do not know whether the C. cldloensis of Sowerby belongs to this 

 species or to C. elegans. It is represented on pi. 42, fig. 40. 



T. GEANIFERA Sowerby. PI. 43, figs. 44, 45. 



Shell ovate, chestnut varied with white and black; dorsum 

 elevated ; front valve radially granose ; lateral areas and posterior 

 area of posterior valve subradiately graniferous; central areas 

 longitudinally granose-lineate, marginal ligament smooth. 



Length 25, breadth 15 mill. (Sowb.*) 



Conception, Chili ; on Mytilus in 9 fms. (Cuming.) 



C. graniferus SOWB., P. Z. S. 1832, p. 104 (Conch. 111., f. 8 ?). 

 KEEVE, Conch. Icon., t. 15, f. 86. Tonieia grani/era CPU., MS. 



Evidently closely allied to T. elegans, having much the same 

 sculpture. 



T. GRAYI Sowerby. PI. 43, figs. 46, 47. 



Shell oblong, pale, varied with brown and rufous ; anterior valve, 

 lateral areas and tail valve radially granose-striate ; anterior margins 

 of lateral areas elevated, posterior margins [sutures] creuulated. 

 Central areas obliquely longitudinally granulose-striate ; third to 

 seventh valves longitudinally bi*nlcate in the middle. Marginal 

 ligament smooth. Length 30, breadth 17? mill. (Sowb.~) 



Island of St. Lawrence, Bay of Callao, Peru, on shells in 17 fms. 

 (Cuming.) 



Chiton gfayii SOWB., P. Z. S. 1832, p. 57 ; Conch. Illustr. f. 8. 

 REEVE, Conch. Icon., t. 17, f. 105. Tonieia grayi CPR., MS. 



This form is evidently closely allied to T. elegant, etc. The 

 italics of Sowerby's description translated above are my own. 



Carpenter thus describes the type specimens : Jugular areas with 

 deep grooves on each side of the central smooth rib, but both grooves 

 and rib are evanescent on the second valve. Central areas with a 

 second set of granules parallel to the diagonal and more or less con- 

 tinued into faint riblets, somewhat diverging from the more prom- 

 inent apices. Lateral areas with a very decided row of rugose 

 granulations along the diagonal, inside of which is a smooth space 

 crowded with metallic dots [eyes] ; then two or more rows of very 

 rough irregular granules, ending in sharply crenate sutures. End 

 valves with about eleven obsolete riblets, irregularly granose, with 

 rows of metallic dots between each. Mucro in front of the middle, 

 swollen, but the slope behind it concave. Anterior valve having 8 



