CHITON. CANOE-SHELL. 
90 
cote from each other; inside smooth, white, with often 
a reddish tinge, the margin thin and plain : teeth flattish, 
two in each valve, with a very ^remote pointed lateral one 
in each valve on the cartilage side, all locking into each 
other; the cavities of the primary ones very deep. 
The specimen before ns of this rare and noble shell, 
taken in Dublin bay, is full four inches long, and more 
than three and a half wide. It has also been found near 
the Giant’s Causeway, at Belfast, in Bantry bay, and at 
Abbs ikiad in Scotland: very rare. v. rn. 
CHITON. CANOE-SHELL . 
Shell boat-shaped, with several valves or plates 
disposed along the back in a transverse manner, 
and incumbent on each other at their front margin, 
i 1. Chiton marginatus. Bordered Canoe-shell. 
Pennant, pi. 39. f. 2— Linn. Trans, viii. pi. 1. f. 2— 
Dorset Cat. pi. 1. f. 2— JVood, pi. 3. f. 4. 
Shell with eight valves, finely punctured like shagreen, 
the seven hinder ones with a small ridge on the back which 
ends in a small beak pointing forwards over the next; the 
margin coriaceous and coarsely serrate; inside covered 
with a tough skin under winch it is polished with the mar¬ 
gin finely notched; color dusky, grey, greenish, or in¬ 
clining to red, often spotted or marbled: length half an inch 
or more; breadth a quarter. In Scotland they appear to 
grow of a large size, as the separate valves have been 
found half an inch wide. 
Variety. Chiton septemvalvis. Montagu, p. 3. 
With seven valves, the five middle ones dark grey, trans¬ 
versely divided, rough on the hinder part and nearly 
smooth in front; the beaks and the two ends rufous brown, 
and the margin faintly reticulate. 
Rocky coasts, on stones and shells, v. v. 
{ 2. Chiton he vis. Smooth Canoe-shell. 
Pennant , pi. 39. f. 3. 
Shell with eight valves, smooth or very faintly striate 
transversely, raised and beaked on the back like the last; 
_ the 
