366 CRANIADiE. 



0. ANOMALA, Muller. 



Plate LVI. fig. 7 and 8 ; (animal) plate U. fig. 2 (as Norvegica). 



Patella atiomala, Mullkr, Zool. Danica, pi. 6. 



„ distorta, Mont. Trans. Linn. Soc, vol. xi. p. 195, pi. 13, f. 5. — Fleming, 

 Edinb. Encyclop. vol. vii. p. 65, pi. 204, f. 4. 

 Anomia turbinata, Dillw. Recent Shells, vol, i. p. 286 (in part).— Index Testa- 



ceolog. pi. 11, f. 2. 

 Discina Ostreoides, Turton, Ditliyra Brit. p. 237. 

 Crania perso7iata, Sowerby, Trans. Linn. Soc. vol. xiii. p. 471, pi. 26, f. 3. — 



Crouch, Introd. Lam. Conch, pi. 13, f. 3 (probably). 

 Criopus anomalus, Fleming, Philosoph. Zool. vol. ii. p. 499 ; Brit. Animals, 



p. 377. 

 Crania rostrata, Brit. Marine Conch, p. 125. 



Orbicula Norvegica, Potiez and Michaud, Galerie de Douai,Moll. vol. ii. pi. 43, 

 f. 1? — Brown, Illust. Conch. G. B. p. 69, pi. 22, f. 9, 

 and pi. 20, f. 21, 22. 

 Cratiia „ Sowerby, Thesaiir. Conch, vol. i. p. 368, pi. 73, f. 15, 16, 17. 



„ anomala, Lov^n, Index Moll. Scandinaviae, p. 29. 



The upper or free valve of this interesting shell is de- 

 pressed, conical, or umbrella-shaped, rather thin, or but 

 moderately solid, either of a rufous broAvn, reddish chocolate, 

 or paler or darker liver-colour, or else broadly rayed, with 

 those hues upon a paler ground of the same tint, and is 

 devoid of all sculpture beyond the mere wrinkles of increase. 

 The shape is suborbicular, with a tendency to become sub- 

 quadrate ; the vertex is acute, submarginal in most ex- 

 amples, but in individuals which have been uninterruptedly 

 developed, subcentral (but not quite in the middle) ; there 

 is generally also a slight indentation or straitening of that 

 portion of the margin which is the nearer to it, or else of 

 that portion immediately opposite the former. Internally 

 the surface is more or less punctated or shagreened ; the 

 upper or eye-like scars of the mask are decidedly large ; 

 the lower or imaginary beardlike ones are still larger, 

 almost, if not quite, united to each other, and each divided 



