60 



7.0 o log i c a I So c t e I y . 



remarks would apply to the dentition, he thought it would be desi- 

 rable to expunge one of the.se genera from our catalogues. 



The following paper, entitled " Descriptions of several new spe- 

 cies of Chitones, brought by H. Cuming, Esq., from the Philippine 

 Islands," by G. B. Sowerby, Esq., jun., was next read. 



Chiton Spiniger. Ch. Spiniger, Mag. Nat. Hist. 1840, p. 287 ; 

 Con. Illus., f. 68. Ch. testa depressd, ovato-rtongatd, omnin/j 

 granulatd ; valvis reclinantibus, terminalibus rotundatis ; margine 

 lato, spinis sub-arcuatis numerosis instructo. 



Long. lat. 1| poll. 



The description is here repeated, for the purpose of noticing two 

 remarkable varieties brought by Mr. Cuming from the Philippines. 



In the first variety the spines are comparatively short, and being 

 coated in patches by calcareous matter, give to the margin an ap- 

 pearance of being banded with black and white. The valves are 

 more rounded, and in some instances more coarsely granulated than 

 in the specimens originally described. Found under stones at low 

 water in Cagayan, province of Misamis, island Mindinao. 



In the second variety the valves are more elevated. Found under 

 stones at low water, in the island Siquijor. 



The larger variety tends to connect the species with the variable 

 Ch. piceus, from which it differs in the narrowness of the valves, the 

 spinose margin, and the purplish flesh tint of the inside, which are 

 the same in all the varieties. 



Chiton alatus. Ch. testa elongatd, subdepressd, grisco-virescente, 

 fusco-virescente maculatd; valvis antice coarctatis, primd et ultima 

 asperis ; areis dorsalibus rotundatis, granoso-striatis ; margine 

 squamoso-granulato . 



Hah. ad insulam Siquijor et Zebu. 



More depressed, having the marginal granulations coarser and 

 the lateral areas more expanded than Ch. limaciformis . 

 Found under stones at low water. 



Chiton truncatus. Ch. testd ovali, minutissime asperd, rosed 

 aut pallide fulvd, griseo-virescente maculatd, sulcis subdistantibus 

 leviter undatd ; areis lateralibus elevatis, expansis ; valvd posticd 

 conicd, antice subcomplanatd, postice truncatd ; margine l<evi. 



Long. 1-50; lat. '80. 



Hab. ad insulam Siquijor, Philippinarum. 



Differing from Ch. crenulatus, Grayi, &c, chiefly in the conical 

 shape and sudden termination of the last valve. The species is sub- 

 ject to great variations, both in the colour and in the strength of 

 the undulating lines. Found under stones at low water. 



Var. testd sublcevi. 



Hab. ad insulam Samar (Catbalonga) . 



Chiton incisus. Ch. testd \ elongatd, grised, fusco -maculatd ; valvis 

 angustis, subdisjunctis, elongatis, longitudinaliter undato-striatis, 

 primd sexfariam costatd, medianis utrinque unicostatis ; areis cen- 

 tralibus latis, ultimd subconicd, utrinque trifariam costatd ; fis- 



