127 
T. Psrrtacea. Lam. 12.—Turt. B. p. 236.—F. p. 
368.—Anomia P. Gmel. 3248.—Ch. f. 713.—D. p. 
296.—Turt. D. p. 5. f. 42,3,4.—Oval convex, blackish 
horn-color, inflected and smooth at the sides, longitudi- 
nally striated on the disc ; beak of the upper valve elon- 
gated, curved and pointed. 1. Teignmouth, excessively 
rare. 
T. Aurita. Flem. Phil. Zool. 2. p. 498. t. 4. f. 5.— 
F. p. 369.—T. Costata. Lowe. Zool. J. 2. p. 105. t. 
5. f. 8,9.—Desh. in Lam.7, p, 351.—Regularly ribbed, 
the eight ribs on the disc the most distinct and rounded, 
obsoletely wrinkled concentrically, the lateral ribs 
indistinct; the larger valve broadest in the middle, 
semicircular at the margin and narrowed at the apex ; 
small valve suborbicular; the hinge margin subtrun- 
cated or rather obtusely angular and having the sides 
depressed ; inner surface punctated. 0,20....0,30. 
W. Scotland. 
Cuiass.—MOLLUSCA. 
OrRDER.—GASTEROPODA. 
Tripe.—PHYLLIDIAN/. 
Grnus.—CHITON. 
Shell consisting of eight imbricated testaceous plates, 
connected by a more or less coriaceous margin. 
