120 
BRITISH MOLLUSCA. 
* Crenella. 
1. Crenella decussata. 
Mytilus decussatus, Mont. T. B. Supp. 69 (not Lamk.); Laskey, 
Wern. Mem. i. 394. t. 8. f. 17; Turton, Conch. Diet. 114; 
Flem. B. An. 411. 
Modiola decussata, Hanley {Thorpe), M. Conch. 29. f. 1. 
Crenella elliptica, Brown, Conch. Text-Book, 143-. 1. 18. f. 13; III. 
C. t. 23. f. 12-14, ed. 2. 75 ; Jeffreys, Malac. Mag. 49. 
Modiola eicercula, Mbller, I. Moll. Green. 19; Hanley, Rec. Shells, 
i. 243. 
? Modiola glandula, Totten, Silliman’s Journ. xxvi. 367. f. 3 ; 
Gould, Invert. Mass. 131. f. 87 ; Hanley, Rec. Shells, i. 243. 
Crenella decussata, Macgilliv. Moll. Aberd. 229 ; Thorpe, Brit. 
Mar. Conch, f. 5 ; Alder, Cat. Moll. North. 82 ; Loven, I. M. 
32. no. 246; Forbes ty Hanley, Brit. Moll. ii. 210. t. 45. f. 2; 
King, Ann. N. H. xviii. 238. 
Modiola faba, Thorpe, Brit. Mar. Conch. 248 (not Mytilus faba, 
0. Fabric.). 
a — t. Zetland. Presented by R. M f Andrew, Esq. 
u—aa. Scotland. 
** Lanistina. 
2. Crenella discors. 
Mytilus discors, Linn. S. N. ed. 12. 1159 (from type, fide Forbes 
Sf Haul.) ; Loven, Ind. Moll. Skand. 33. 
M. discors /3, Mat. fy Rack. Linn. Trans, viii. 111. t. 3. f. 9. 
Modiolaria discors, Loven, I. M. 33. n. 247. 
Mytilus discrepans, Mont. T. B. 169 (not Supp.) ; Turt. Conch. 
Diet. 112; Brit. Faun. 164. no. 315; Dillw. Rec. Shells, i. 
319. 
Modiola discrepans, Lamk. Hist. 2nd ed. vii. 23 ; Turt. B. Biv. 
202 ; Forbes, Mai. Monens. 44 ; Thorpe, Brit. Mar. Conch. 
108 ; Aid. Cat. North. Moll. 81; Gould, Inv. Mass. 129. f. 83 ; 
Hanley, Rec. Shells, i. 242. 
? Modiola minuta (fry), Couch, Corn. Faun. ii. 33 (not described) ; 
Brown, III. C. G. B. t. 39. f. 36 (unnamed). 
Crenella discors, Forbes Hanley, Brit. Moll. ii. 195. t. 45. f. 5, 6, 
&t. 48. f.5. 
a, b, Sunderland. 
3. Crenella marmorata. 
Mytilus discors, Mont. T. B. 1 67 (not Linn, nor Fabric.); Da 
Costa, B. S. 221. 1. 17. f. 1 ; Don. B. S. i. t. 25. f. 1 ; Mat. Sf 
Rack. Linn. Trans, viii. Ill (not var.), t. 3. f. 8; Pulteney 
