226 TESTACEOUS MOLLUSCA. 
CHAMA. 
Trregular, inequivalve, adherent; beaks incurved, unequal: hinge 
mith one thick oblique subcrenated tooth fitting into a hollow in the 
opposite valve ; tno distant lateral muscular impressions : ligament 
external and depressed. 
C. Macropnyitia Chem. f. 514,5.—C. Lazarus Lam. 1. (not 
Lin)—Sow. G.—Reeve. t. 96. f.3.—C. Gryrnoiwes D. p. 221— 
W. t. 9. f. 19.—E. t. 196. f. 4, 5.—Seba 3. t. 88. f. 8. Uniform 
reddish purple or yellow, sometimes the former with a yellow tinge 
at the beaks, never distinctly sinuated, imbricated with numerous 
rather small close-set convex more or less linguiform foliations ar- 
ranged in concentric wavy folds ; edges of the foliations simple, 
never jagged or ramose. 2..14. American Seas. 
C. Lazarus Lin. Mus. Ulr. 513.—Lin Sys. 1139.—D. p. 221. 
—W.t. 9. f. 18.—Seba 3. t. 89. f. 6,9,11.—C. Damacornis Lam. 
2.—Ch. f. 507, 8, 9.—Sow. G.—Reeve Sys. t. 96. f. 1.—E. t. 197. 
f. 1. Imbricated ; white with purplish crimson spots at the base 
of the lamellze which are deeply lobed; lobes elongated, large, ra- 
diatingly sulecated, forked at the apex. 4. Indian Seas. 
C. Grypnoiwes. Lin Syst. 11389—Lam.. 3.--Phil. 68.—Polh. t. 
23. f. 3. (good) —Ch. f. 510 to 513.—E. t. 197. f. 2.—Blain. t. 70 
f.2—C. Fotracea W.t. 9.f. 22. Uniform white (sometimes tin- 
ged with red upon the scales and often somewhat rufous within) 
imbricated, rather muricated, somewhat roughened by short de- 
pressed plicated vaulted lamella ; upper valve usually but slightly 
convex though at times even more gibbose than the lower, whose 
moderately sized apex is spiral (generally inclining outwards) and 
turned to the right : tooth of the lower valve short, thick, com- 
pressed, often striated, of the upper more depressed and subsinuated 
1. Mediterranean. ! 
C. Crenutatus Lam. 4.—Adamson Sen. t.15. Jataron—E. t. 
196. f. 1. Almost round, rosy or flesh coloured, very strong. sub- 
imbricated, unarmed, radiating, wrinkled, the wrinkles coarse, 
unequal and veryirregular ; anteriorly with two interrupted callous 
radiating ribs; apex of the lower valve somewhat spiral; inside 

! The Unrcornis of Lamare. 5. with a very produced beak, (Ch. 
f. 519, 0.—E. t. 196. f. 6.—C. Cornuta W. ¢. 9. f. 20.) is no 
more than a variety of this and Macrophylla.—The C Gryruina of 
Phillipi. p. 68. is possibly a variety of his Gryphoides. ‘ Imbri- 
cated, thick, the scales unequal and most of them depressed ; apex 
of the lower valve sinistral.” 

