122 
BRITISH MOLLUSCA. 
Mod. depressa, Hanley , Rec. Shells , i. 242, note. 
Modiolaria nigra, Loven, I. M. 33. n. 249. 
Crenella nigra, King, Ann . IV. H. xviii. 239 ; Forbes 8f Hanley , 
Bn/. Mo/I. ii. 202. t. 44. f. 5, & t. Q. f. 7, animal. 
a — c. Black Rocks, Leith. 
d — k. Britain. 
I — y, jnn. Britain. 
z — e e , jun. Sunderland. 
*** . 
6. Crenella Prideauxiana. 
Modiola Prideauxiana, Leach , ,Zoo/. d&c. ii. 35 ; Brown , I//. C. 
t. 29. f. 9, ed. 2. t. 27. f. 9. 
Modiola rhombea, Berkeley, Zool. Journ. iii. 229 ; Supp. 1. 18. f. 1 ; 
Thorpe, Brit. Mar. Conch . 107 ; Brown, III. Conch, ed. 2. 78. 
t. 39. f. 17. 
Crenella rhombea, Forbes fy Hanley, Brit. Moll. ii. 208. t. 45. f. 3. 
Modiola costulata, Philippi, Sic. 70. t. 5. f. 1; not Philippi, ii. 50, 
nor Risso. 
Mod. Petagnse, Scacchi; Philippi, ii. 51. 
a — d. Coast of Devonshire. Presented by — Prideaux, Esq?. 
e. Weymouth. Presented by the Rev. M. J. Berkeley. 
Fam. 2. Dreissenidje. 
Dreissenadse, Gray, Turton Man. ed. 2. 299. 
Dreissenidse, Gray, Syn. B.M. 1840; 1842, 82, 91 ; Proc. Zool 
Soc. 1847, 199. 
Mytilaces, part.. Rang, Man. 290. 
Mytilacea, part., Anton, Verz. Conch. 12. 
Chamaceee, part., Herrmannsen, Ind. 409. 
1. Dreissena. 
Dreissena, Van Beneden, Ann. Sci. Nat. 1$35 ; Gray, Turton ? s 
Man. Land fy Freshwater Shells, 300 ; Syn. B. M. 1840 ; 1842, 
82, 92 ; Proc. Z. S. 1847, 199 ; Forbes 8f Hanley, Brit. Moll, ii, 
Driessena, Brown, III. C. G. B. 
Mytilina or Mytulina, Cantraine, 1835. 
Trickogonia, Rossmasler, Icon. 1835. 
Cselogonia, Bronn. 
Mytilus (3, Rang, Man. ; Megerle, Entw. 1811. 
Mytilus, sp., Schroter, Einleit.; Sow. Gen.; Lamk. Hist. ed. 2. vii. 
Dythalmia, Jay. 
1. Dreissena polymorpha. 
Mytilus Volgse, Chemn. xi. 256. t. 205. f. 2028. 
Myt. polymorphus, Pallas , Voy . Russ . i. 478, App. 211 ; Schroter, 
