BRITISH MOLLUSCA. 
121 
Hutch. Dors. 38 ; Ind. Test. t. 12. f. 39 ; Poli, Test. Sic. ii. 
211. t. 32. f. 15; Laskey, Mem. Wern. Soc. i. 393; Dorset 
Cat. 40. t. 2. f. 1; Turt. Conch. Diet. 112; Brit. Faun. 164. 
no. 314 ; Dillw. Rec. Shells , i. 319 ; Mawe, Conchol. 1. 13. f. 5. 
Modiola discors, Turt. Biv. 201. t. 15. f. 4, 5 (not Lamk. nor 
Gould ); Flem. B. An. 413; Macgilliv. Moll. Aberd. 239; 
Thorpe, Brit. Mar. Conch. 108. 
Mytilus discrepans, Desk. E. M. Vers, ii. 567- 
Modiola discrepans, Philippi, Moll. Sic. i. 70, ii. 50. 1. 15. f. 11. 
Modiola marmorata, Forbes, Malac. Monens. 44 ; Jeffreys , Mag. 
Conch. 41 ; Brown, III. C. G. B. 78. t. 27. f. 10 ; Thomps. Rep. 
Brit. Assoc. 1843, 261. 
Mod. europsea, D’Orbig. Mus. Paris. 
Mod. tumida, Hanley, Rec. Shells, i. 241. t. 12. f. 39. 
Mod. Poliana, Philippi, Zeitsch. Malak. 1844, 101 (from type). 
Crenella marmorata, Forbes fy Hanley, Brit. Moll. ii. 198. t.45. 
f. 4. 
a — d. Sunderland. 
e — h. Oban. 
i — w. Britain. 
x — b b (jun.). Ditto. 
4. Crenella costulata. 
Modiola costulata, Risso, Hist. Nat. Eur. Mer. iv. 324. f. 165 
(fide Philippi ) ; Jeffreys, Ann. Nat. Hist. xix. 313 ; Philippi, 
Moll. Sic. ii. (not i.) 50. 1. 15. f. 10 (not D’Orbign. Moll. Ca- 
nar. nor Hanley, Recent Shells, i. 240). 
Crenella costulata, Forbes fy Hanley, Brit. Moll. ii. 205. t. 45. f. 1 . 
Inhab. Exmouth, Clark. Cornwall, Alder, &c. 
5. Crenella nigra. 
Modiola nigra, Gray, App. Parry 5 * * * 9 s Voy. N. Pole, adult; Thorpe, 
M. Conch. 249. f. 5, jun. ; Alder, Cat. Moll. North. 81 ; Han- 
ley, Rec. Shells, i. 242. 1. 12. f. 38. 
Mytilus discors, var., Chemn. Conch. Cab. viii. 195. t. 86. f. 767 ; 
Schroter, Einleit. Conch, iii. t. 9. f. 15 ; var. Suecicus, O. Fa- 
bricius, Danske Videns. Selsk. Nye Samm. 1788, 460 (part.). 
Mytilus discrepans, Mont. T. B. Supp. 65. t. 26. f. 4 (not 169); 
Ind. Test. t. 12. f. 38; Leach, App. Ross’s Voy. 176 ; Zool. 
Miscell. ii. 36 ; M . fy R. Linn. Trans, viii. 111. t. 3. f. 9. 
Modiola discrepans, Leach, Ross’s Voy. 176; Flem. B. An. 413; 
Turt. Biv. 202 ; Macgilliv. Moll. Aberd. 238 ; Brown, III. C. 
G. B. 78. t. 27. f. 8; Sow. Gen. Shells, Modiola, f. 3; Reeve , 
Conch. Syst. 1. 100. f. 3; Philippi, Zeitsch. 1844, 102. 
? Mod. nexa, Gould. 
Mod. compressa, Menke , Cat. Conch. Malsburg. 
F 
