61 
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. 
Cuiton Spinicer. Ch. Spiniger, Mag. Nat. Hist. 1840, p. 287; 
Con. Illus., f. 68. Ch. testé depressd, ovato-elongatd, omnind 
granulatd ; valvis reclinantibus, terminalibus rotundatis ; margine 
lato, spinis sub-arcuatis numerosis instructo. 
Long. 251; lat. 14 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. 
Cuiton atatus. Ch. testa elongatd, subdepressd, griseo-virescente, 
Susco-virescente maculata ; valvis antic? coarctatis, primd et ultima 
asperis; areis dorsalibus rotundatis, granoso-striatis ; margine 
squamoso-granulato. 
Hab. 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. 
Cuiton truncatus. Ch. testd ovali, minutissime asperd, rosed 
aut pallide fulvd, griseo-virescente maculata, sulcis subdistantibus 
leviter undatd ; areis lateralibus elevatis, expansis ; valvd posticd 
conicd, antice subcomplanatd, posticé truncatd ; margine levi. 
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 sublevi. 
Hab. ad insulam Samar (Catbalonga). 
Cuiton incisus. Ch. testd elongata, 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- 
surd triangulari posticé incisd ; margine lato, fasciculis minutis- 
simis numerosis instructo, postice inciso. 
