TRIBE CONCHACEA. 9] 
ing: umbones rather blunt, with a few deeper strie.—Hngland.— 
Minute. 
C. PutcHetra.*—Pisrpium P. Jenyns Mon. 18. t. 21. f. 
1.—Gray. Turt. p. 284. f. 151.—Carprum Amnicum JuNior. 
Mont. p. 88. Obliquely ovate, inequilateral, ventricose, deeply 
striated concentrically: umbones rather blunt, simple.— Variety— 
Jenyns. Mon. t. 21. f. 2, 3.—C. Fontrnauis of Bronwn and Al- 
der. Smaller, thin, finely striated, umbones rather acute.— Va- 
riety—Obliquely oval, finely striated, compressed, margin acute. 
—Variety—(Jen. Mon. t. 21. f. 4, 5.) Rather oblong, very 
ventricose, deeply striated : edge very blunt, hinge margin nearly 
straight.— Hngland.— Minute. 
C. AppenpicuLatTa.* Turt. Mon. p. 15. f. 6.—Pistprum 
Henstowranum. Jen. Mon. p. 20. t. 21. f. 6, 7.—Gray. Turt. 
J. 6.p. 285. Obliquely oval, ventricose, finely striated concentri- 
cally, inequilateral; umbones rather acute, with a laminar projec- 
tion. —LHngland.— Minute. 
C. Crnerea.*—Pisipium C. Alder. Cat. sup. p. 4.—Gray. 
Turt. p. 286. Greyish or cinereous, inequilateral, rather com- 
pressed, oval, finely striated, with two or three deeper sulcations, 
forming darker zones across the shell : margin of the valves meet- 
ing at a rather acute angle; umbones obtuse and not much pro- 
duced ; sometimes slightly capped as in Calyculata.—Variety— 
More ventricose and produced at the umbones. 1.—Hngland. 
C. Partumeta. Say. J. A. N. S. Phil. 2. p. 380.— Gould. 
Mas. p. 73. f. 54.—C. Cornea. Var.2, 3. Lam. Rounded- 
oval, slightly broader anteriorly, not at all angulated, thin, fragile, 
pellucid, tumid, shining, nearly smooth, light greenish horn-colour, 
with a marginal band of lilac or yellow: hinge margin nearly 
straight : ventral edge arcuated: beaks sub-central, moderately 
elevated, inclining inwards: inside tinged with lilac, cardinal teeth 
small, diverging, lateral strong and white.— Young—Light yellow, 
transparent, less tumid and longer. 2..%.—Massachusets, Sc. 
C. Errcans. Adams in Bost. Jour. of N. H. 3. t. 3. f. 11.— 
Gould. Mas. p. 75. f. 55. Obtusely sub-quadrilateral, all but equi- 
lateral, the edges sub-parallel, ventral edge nearly straight ; 
tumid when adult, compressed when young, not regularly convex 
but somewhat flattened down the middle, olive green with a straw- 
coloured margin and narrower zones, fine rounded concentric 
wrinkles; beaks not prominent; inside bluish, the cardinal teeth 
rudimentary, the lateral large and strong. ~,..1.—Massachusets.1 
ZO°"2 



1 Add C. RuompoipEa. See too C. ARGENTINA and PutL- 
CHELLA of D’Orb. in Alag. de Z. 1835.—C. Bantensis. Spia. 
Test. Braz. t. 23. f. 5, 6.—C. Sramingea. Conrad.—C. Trays- 
veRSA, C. Dupia. (Gould. f. 56.) and Epentuta. Say. 
