TRIBE CONCHACEA. 91 



ing : umbones rather blunt, with a few deeper strise. — England. — 

 Minute. 



C. Pulchella.* — Pisidium P. Jenyns Mon. 18. t. 21. f. 

 1. — Gray. Turt. p. 284. f 151.— Cardium 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. Fontinalis of Brown 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 . — England. — Minute. 



C. Appendiculata.* Turt. Mon. p. 15. f. 6. — Pisidium 

 Henslowianum. Jen. Mon. p. 20. t. 21. /. 6, 7. — Gray. Turt. 

 f. 6. p. 285. Obliquely oval, ventricose, finely striated concentri- 

 cally, inequilateral ; umbones rather acute, with a laminar projec- 

 tion. — England. — Minute. 



C. Cinerea.* — Pisidium C. Alder. Cat. sup. p. A. — 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. -*-. — England. 



C. Partumeia. 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, J- . . ^. — Massachusets, tyc. 



C. Elegans. Adamsin 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. -^ . .±. — Massachusets. 1 



1 Add C. Rhomboidea. See too C. Argentina and Pul- 

 chella of D'Orb. in Mag. de Z. 1835.— C. Bahiensis. Spix. 

 Test. Braz. t. 23. /. 5, 6. — C. Staminea. Conrad.— C. Trans- 

 versa, C. Dubia. (Gould, f. 56.) and Edentula. Say. 



