BRITISH MOLLUSCA. 
29 
Loven described three varieties : — 
a. As long as high, subtrigonal, red-spotted behind. C. Pen- 
nanti, Reeve. C. serratum, Turt. C. laevigatum, Thorpe . 
|3. Longer than high, subovate. C. Norvegicum, Spengler = 
C. laevigatum jun., Mont. 
y. Higher than long, subovate, rather obtuse ; ribs nearly ob- 
literated. C. . 
Fam. 4. Mactrad^e. 
Mactridae, Fleming , Brit . Anim. 409, 1828 ; Gray, Syn. B . M. 
1840, 1842, 75. 
Mactradae, Gray , Proc. Zool. Soc. 1848, 185 (Loudon, Mag. N.H . 
i. 370, 1837; Forbes Sf Hanley, Brit. Moll. 349. 
Les Mactracees (Mactracea), Lamk. CourA07 ; Hist.v. 466,ed.2. 
v. 87. 
Conchaces § 2. part.. Rang, Man. Moll. 302. 
Pylorides, part., Blainv. ; Rang, Man . Moll. 322. 
Mactraces, Feruss. Prod. 44. 
Mactraceae, Hinds, Zool. Sulph . 184. 
Mactracidae, D’Orb. Moll. Canar. 1836. 
Yeneridia heteroperia, Rafin. Anal . 2Vh£. 
Mactracea, Menke, Syn. 118; Anton, Verz. Conch. 12. 
Mactrina, Macgilliv. Moll. Aberd. 217 ; Milne-Edwards, Elem. 
Zool. ; Brown, Conch. Text Book. 
Mactracaea, Berth. 
Callista and Callistoderma, part., Poli, Test. Sicil. 1791. 
Trigonella, part., Da Costa, Test. Brit. 1778 (not DeCand. nor 
Conrad)-, Humph . Mus. Calonn. 1797. 
a. Mactrina. Mantle lobes free. 
Mactraadae, part., Leach, Ann. Sf Mag. N. H. xx. 1847, 272. 
1. Mactra. 
Mactra, Gray, Mag. Nat. Hist. i. 370, 1837 ; Wiegmann, Arch. N. 
1838, i. 86; Proc. Z. Soc. 1848, 185 ; Sow. Gen . 
Mactra (stultorum), Linn. S. N. ed. 12. i. 1125; Gmelin, S. N. 
i. 3258 ; Lamk. Syst. 121, 1801 ; Hist. A. s. V. v. 471, ed. 2. 
vi. 96 ; Forbes Sf Hanley, Brit. Moll. 350. 
Trigonella, part.. Da Costa, Brit. Shells, 1778. 
1. Mactra stultorum. 
Cardium stultorum, Linn. S. N. ed. 10, 681. 
Mactra stultorum, Linn. S. N. ed. 12. i. 1125 ; Gmel. L. S. N. i. 
3258; Pulteney Hutch. Dorset , 31; Mont. T. B. 94; Linn. 
Trans, viii. 69; Don. B. S. ii. t. 106; Turton, Conch. Diet . 
