12 
CATALOGUE OF 
7. Placunanomia ALOPE. 
Upper valve flat, smooth, radiately striated. Scars two, well se- 
parated, rounded, equal-sized. 
Placunanomia alope. Gray, P. Z. S. 1849, 122. 
a, h. California. Two upper valves. Presented by Lady Ka- 
therine Wigram. 
ft European. 
8. Placunanojiia patelliformis. 
Shell suborbicular, convex or quite flat, radiately striated ; inner 
disk greenish. Apex rather within the dorsal margin. 
The upper muscular scar of the dorsal valve very large, oblong; 
the lower one small, roundish, on the lower part of the hinder mar- 
gin of the upper one. 
I’he peduncle of the cartilage with a triangular cavity in front, 
under the tip, and continued in an oblong, rib-like ridge towards 
the centre of the shell. 
Anomia patelliformis, Linn. S. N. 1152; Nov. Act. Upsal. 1773, 
i. 42, t. 5, f. 6, 7 ; Relzius, Nov. Gen. Test. ii. ; Sars, fide Mus. 
Cuming ; Loren, Moll, Scund. 30 ; Forbes Hanley, Brit. Moll. 
334, t. 56 ; Wood, Index Test. t. 10, f. 10, not Chemn. 
Squama Magna, Chemn. Conch, vii. 87, t. 77, f. 697. 
Anomia Squama, Gmelin, S. N. ; Schumacher, Essai. 
Ostreum striatum. Da Costa, Brit. Conch. 162, t. 11, f. 4. 
Anomia undulatim striata, &c., Chemn. Conch, viii. 8, t. 77, f. 699. 
Anomia undulata, Gmelin, Syst. Nat. i. 3346 ; Mont. Test. Brit. 
157, t. 4, f . 6 ; Maton ^ Racket, Trans. Linn. Soc. viii. 103 ; 
Turlon, Conch. Diet. 4, Bivalves, 230, t. 18, f. 8, 9 ; Dillw. R. 
S. i. 289 ; Wood, Didex, Test. t. 1 1 , f. 9. 
Ostrea striata, Pulteney in Hist. Dorset, 36 ; Donovan, B. Shells, 
ii. t. 45 ; Mont. T. B. 153, 580. 
Anomia striata, Loven, Index Moll. Scand. 29 ; Forbes ^ Hanley, 
Brit. Moll. 336, t. 55, f. 1,6, t. 53, f. 6. 
Placunanomia patelliformis. Gray, P. Z. S. 1849, 122. 
a, b, c, d. Adult and young. British shores. Mus. Montague. 
e, f. Coast of Devonshire. 
This species is easily known from the other European species of 
the family by being generally thicker and regularly radiately rib- 
bed, and greenish ; but the number and position of the muscular 
scars at once separate it from all the multiform varieties of that 
species. Some authors, overlooking the latter character, have been 
inclined to regard it as a mere variety of Anomia ephippium. 
