no 
BRITISH MOLLUSCA. 
b b — e e (short* salmon-coloured inside). Castle Ashby. Pre- 
sented by the Marquis of Northampton. 
ff (very deep salmon-coloured inside). Herefordshire. Pre- 
sented by G. Waterhouse* Esq. 
g g — i i (light salmon-coloured inside). Wednesbury* War- 
wickshire. Presented by Mrs. Corrie. 
jj, kk (var. distorted). River Thames. 
1 l (ditto). Presented by J. D. C. Sowerby* Esq. 
Fam. 5. Arcade. 
Arcadse, Leach * MSS. 1818* Ann. Sf Mag. N. H. xx. 272 ; Flew,. 
Brit. An. 382* 1828; Gray * Syn. B. M. 1840; 1842* 81* 91; 
Proc. Zool. Soc. 1847, 197. 
Arcadae* part.* Swains. Malac. 382, 1840. 
Axinea and Axinoderma* Daphnaea and Daphnaeoderma, Poli * 
Test. Sicil. 
Les Arcacees (Arcacea), Lamk. Phil. Zool. 318* 1809 ; Cour. 106* 
1812; Hist. v. 33* ed. 2. vi. 451; Blaine. Diet. Sci. Nat. x. 
21 6; Sow. Conch. Man. ed. 2. 72. 
Arcaces, Feruss. Prod. 42; Rang * Man. Moll. 287. 
Byssiferia* Limaeridia and Pernaridia* part.* Rqfin. 
Pectunculidae, Leach * MSS. 1818* Ann. fy Mag. N. JT.1847, 272. 
Arcacea, Anton, Verz. Conch. 12. 
Arcina* part.* Macgilliv. Moll. Aberd. 207- 
Area* Linn. Syst. Nat. 
Arcae* § 3. part., Oken, Zool. 1815. 
Arcaria, Gravenh. Thier. 33* 1845. 
Arcacidae* D’Orb. Pal. Frang.; Geinitz * Grund. 
Arcaceae* part.* Menke, Syn. 60* 1828. 
Arcadae* part.* Forbes fy Hanley, Brit. Moll. ii. 
Pogonopoda* part.* Gray, Lond. Med. Repos. 1821. 
Polydonta* Blainv. Diet. Sci. Nat. xxxii. 320* 1824 ; Malac. 535* 
1825. 
? Polybranchiata* G. Sow. Conch. Man. ed. 2. 233. 
* Arcade* Leach . 
1. Arc a. 
Area* part.* Linn. S. N. ed. 10. 1758* ed. 12. 1140* 1767; Gmelin, 
S. N. 3305* 1788 ; Brug. Enc. Meth. i. 92* 1789. 
Area (Noae), Lamk. Syst. 115, 1801 ; Hist. ed. 2. vi. 457, 1818 ; 
Rang, Man. 28 7 ; Desh . Ency. Meth. iii. 553 ; Leach, MSS. 
1818* Ann. fy Mag. N. H. xx. 272; Sow. Gen. ; Conch. Man. 
ed. 2. 71 ; J. Sow. Min. Conch, t. 44 ; Blainv. Malac. 535, 
