18 
BRITISH MOLLUSCA. 
z , a a. River Fosse, York. Presented by Rev. W. Hincks. 
b b — r r , old and young. York. Presented by P. Carpenter, 
Esq. 
2. Sph^erium corneum. 
Tellina cornea, Linn. S . N. ed. 12. 1120 ; Faun. Suec. ed. 2. 517 ; 
Linn. Trans . viii. 59 ; Donov. B. S. iii. t. 96 ; Turt. Conch. 
Diet. 179; Penn. Brit. Zool. ed. 4. 75. t. 49. f. 36. ed. 1812. 
t. 52. f. 3; Schroeter , Flussconch. 189 (pars), t. 4. f. 4; Dillw. 
Rec. Shells, i. 104. 
Nux nigella, Humph. Calonne Cat. 
Tellina rivalis, Muller , Verm. Hist. ii. 202. 
Cardium corneum, Mont. T. B. 86 ; Pulteneu Hutchins’ Dorset , 
31. 
Cardium nux, part.. Da Costa, B. S.l 
Cyclas cornea, Lamk. Hist. v. 558, ed. 2. vi. 268 (not vars.) ; 
Pfeiffer, 120. t. 5. f. 1, 2 ; Nilsson, Moll. Suec. 96 ; Turton,Biv. 
248. 1. 11. f. 14; Man. Land and Freshwater Shells, 13. t. 1. 
f. 2; Gray, ditto, 280. 1. 1. f. 2; Flem. B. A. 452 ; Jenyns, l. 6. 
iv. 295; Brown, III. Con. G. B. 93. t. 39. f. 19; Kickx, Moll. 
Brabant, 87 ; Philippi, Moll. Sic. ii. 30; Gras, Moll. t. etfl. 
France, 72. t. 6. f. 2; Hanley, Rec. Shells, 1-89; Supp. t. 9. 
f. 15 ; Forbes fy Hanley, Brit . Moll. ii. 113. t. 37. f. 3-6. 
Var. 1. Stagnicola. Shell subglobose, rather flattened on the 
basal edge ; umbones tumid, pellucid, very prominent. 
Cyclas rivalis, Drap. Moll. 129. t. 10. f. 4, 5 ; Brard, Coq. ter. et 
fl. 222. t. 8. f. 4, 5. 
Tellina stagnicola, Shep. Linn. Trans, xiv. 150. 
Cyclas flavescens, Macgilliv. Moll. Aberd. 246. 
Cyclas stagnicola, Leach, MSS. Brit. Mus. 
C. cornea /3, Jenyns, l.c. 8. 
Cyclas citrina. Brown, III. Conch. G. B. 132. t. 39. f. 37. 
Var. 2, gibbosa. Shell very gibbous; margin very blunt. 
Var. 3. compressa. Shell rather compressed ; the margin meeting 
at an acute angle. 
Var. 4, minor. Small, nearly globular. 
a — m. Coggeshall, Essex. 
n — z, old and young. York. Presented by P. Carpenter, 
Esq. 
a a — w w. Near Edinburgh. Presented by Miss Greville. 
xx — q q q. Regent’s Canal. 
r r r — w w w, old and young. Brislington near Bristol. 
Presented by P. Carpenter, Esq. 
