496 
ME. H. N. EIDLET ON THE 
shells found attached to rocks, when placed upon a flat surface, 
rest upon the anterior and posterior margins only, so that the 
sides are slightly raised. 
39. Chiton (Ischnochiton P) pectinaths, Sowerby. 
Chiton pectinatus, Sowerby , Con. III. pi. 174. f. 146; Reeve, Con. Icon. 
pi. 26. f. 133. 
Sab. P (Reeve); West Indies (P. P. Carpenter in Brit. 
Mus.). 
The marginal scales are not at all well drawn by Sowerby, 
being much too elongate. 
40. Chiton (Ischnochiton) caeibbh:oeum, Carpenter. 
(Plate XXX. figs. 5, 5a.) 
Testa elongato-ovalis, vix carinata, varie picta, griseo-olivacea, 
albo, rufo et olivaceo picta, vel purpurea, interdum nigrescens, 
albo' virgata, valvis terminalibus concentrice et rugose granoso- 
striatis vel squamatis, centralibus liris tenuissimis granosis cur- 
vatis flexuosis ornatis, areis lateralibus rugose granosis vel squa- 
matis ; valva postica pone apicem centralem leviter concava ; 
cingulum minute squamatum, squamis miuutis elongatis ovalibus 
indutum, pallide roseo-griseum, dilute nigro tessellatum. 
Longit. 27 millim., diam. 9. 
Sab. St. Thomas (Brit. Mas.). 
The above appears to be a manuscript name attached to speci- 
mens in Cuming’s collection which are identical with few shells 
from Pernando Xoronha. The colour is very variable, some 
specimens, when viewed from a distance of twelve inches, appearing 
olive-grey speckled with white ; others are of a pinkish cream- 
colour speckled with red or blotched along the sides in front of the 
lateral areas with black, as in some of the specimens from Pernando 
Noronha. The granules or scales of the lateral area aud on the 
front and posterior valves are peculiarly flat and are somewhat 
transversely arranged on the former and concentrically on the 
latter. The central areas are finely punctured along the centre, 
and become more and more coarsely grauosely lirate as the sides 
are approached. One example is almost entirely reddish purple, 
and others are blackish with a broad pallid stripe down the middle 
from end to end. 
41. Chiton (AcANTnocniTON) asteioeb, Reeve. 
Chiton astriger. Reeve, Conch. Icon. pi. xviii. f. 109. 
Sab. Barbados. 
