290 GINGLYMACONCHA. VENERIDA. 
Tellina lacustris, Mill. Verm. 204. no. 388; Schrit. Fluss- 
eonch. 191. no. 12; Chem. Conch. vi. t. xiii. f. 135; Gmel. 
Syst. Nat. 3242;. M. & R. Trans. Linn. Soe. viii. 60; 
Wood, Gen. Conch. t. Ixvii. f. 5; Flem. Edinb. Encyel. 
vu. ; Dill. Dese. Cat. 104; Turt. Conch. Dict. 180; Drap. 
Hist. Nat. des Moll. terrest. et fuv. 130. t. x. f. 6, 7. 
Cyclas lacustris, Lam. Hist. Nat. des Anim. sans Vert. v. 
599; Elem. Ldinb. Eneyel. . 
Cardium lacustre, Mont. Test. Brit. 89. 
This species is found occasionally in lakes, but more fre- 
quently in marshes: I have found it occasionally in the rapid 
rivulets near the Forest of Dartmoor. 
3. CycCLAS CORNEA. 
Shells gibbose, concentrically striolated, with one or two 
grooves; the umbones prominent. 
Tellina cornea, Lister, Anim. Angl. t. 1. f.31; App.t. 1.£. 5; 
Conch. t. chix. f. 14; Linn. Faun. Suec. 2138; Syst. Nat. 
1120. no. 72; Penn. Brit. Zool. iv. 89. t. xlix. f. 36; 
Maton, Trans. Linn. Soe. ii. t. xi. f. 39, 40; Pult. Cat. 
Dorset. 31. t. vu. f. 2; Donov. Brit. Shells, t. xev.; M. 
§ R. Trans. Linn. Soc. vi. 59; Flem. Edinb. Encycel. vii. ; 
Dill. Dese. Cat. 104; Turt. Coneh. Dict. 179. 
Cyclas rivalis, Drap. Hist. Nat. des Moll. fluv. et terrest. 129. 
i x i, 4,5. 
Cyclas cornea, Lam. Hist. Nat. des Anim. sans Vert. v. 558 ; 
Flem. Edinb. Encycel. vii. 
Cardium Nux, Da Costa, Brit. Conch. t. xu. f. 2. 
Cardium corneum, Mont. Test. Brit. 86. 
Var. a. Testis absque sulco transversali, List. Anim. Angl. 
App. 22. 
Cardium amnicum, Pult. Cat. Dorset. 31. 
Var. 3. Shells without the groove or grooves. Length half 
an inch; height five-eighths of an inch. 
Colour of the epidermis horn or olive-brown. 
This species is common in marshes and ditches; is found 
extremely large in the Thames. 
