BRITISH MOLLUSCA. 
117 
q — e e. Bell Rock. Presented by Dr. Leach. 
//(group of young in sea-weed). Britain. Presented by 
Mrs. Robinson. 
g g - — kk. Britain. 
1 1 (groups of young). Falmouth. Presented by W.P. Cocks, 
Esq. 
mm — tt. Scarborough. 
uu — xx. Britain. 
yy — ddd. Ditto. 
eee—jjj. Ditto. 
k k k — m m m. Scotland. Presented by Miss E. Greville. 
nnn. Falmouth. Presented by W. P. Cocks, Esq. 
o o o — q q q. Hastings. Presented by Mrs. Robinson. 
r r r — 1 1 t. Belfast. Presented by W. Thompson, Esq. 
uuu — zzz. Britain. 
aaaa (groups congregated together). Whitley, Northum- 
berland. 
2. VoLSELLA. 
Volsella, Scopoli , Int. H. N. 39 7, 1/7 7; Gray , Proc . Z . Soc. 
184 7, 198. n. 717. 
Modiola, Lamk. Prod. 1799 ; Syst. 113, 1801; Ann. Mus. vi. 119, 
1805; Hist.v i. 109, 1819, ed. 2. vii. 15; Cuvier , Anat. Comp. 
1808 ; R. A. 1817 ; Leach , Zool. Misc. ii. 31, 1815 ; Sow. Man, 
ed. 2. 190; Forbes Hanley , Brit. Moll, ii. 181; Swainson, 
Malac. 1840. 
Modiolus, Risso, Bur. Merid. 1826; Fleming , B. A. 412, 1828 ; 
Forbes , Malac. Mon. 43, 1838; not Llwyd. 
Mytilus j3, Schumacher , N. Syst. 1817. 
Mytilus a, Blainville, Malac. 
Callitriche and Callitrichoderma, part., Poli, Test. Sicil. 
Tamarindiformes, Meuschen , Mus. Gevers. 1787- 
Musculus, sp., Bolten , Mus. 110. 
Perna (lutat), part., Adans. Seneg. 
Amydalum (arborescens), Megerle, 1811. 
1. Volsella modiolus. 
Mytilus modiolus, Linn. S. N. ed. 12. 1158; Penn. Brit. Zool . 
ed. 4. iv. 96. t. 66. f. 77; Mont. T. B. 163; Mat. $ Rack. 
Linn. Trans, viii. 107 ; Dorset Cat. 40; Da Costa, B. C. 219. 
1. 15. f. 5 ; Don. B. S. i. t. 23 ; Pulteney Hutchins' Dorset, 38 ; 
Brown , III. C. t. 29. f. 1-6, ed. 2. 77 ; Flem. Edin. Bnc. vii., 
t. 203. f. 22 ; Laskey , Mem. Wern. Soc. i. 392; Chemn. Conch. 
Cab. viii. 178 (not t. 85. f. 757) ; Mull. Zool. Dan. t. 53 ; Dillw . 
Rec. Shells, i. 314; Ind. Test. 1. 12. f. 31. 
Modiola modiolus, Turt. B. Biv. 199. 1. 15. f. 3 ; Thorpe, B. M. 
