TRIBE BRACHIOPODA. 317 



drawing does not suit this shell; it exhibits a very decided rostellum, 

 and, absolutely simple and reniform lower scars, that greatly exceed the 

 upper ones in size. 



C. Anomala.* — Patella A. Midi. Z. B. t. 6. — P. Distorta, 

 Mont. Tr. Lin. 11, p. 195, t. 13, /. 5. — Anomia Turbinata, Bit. in 

 part. — Criopus A. Flem. — Cra. Rostrata, Brit. Mar. C. — 

 Orbicula Norvegica, ham. from synonymy. — Brown. — Cra. N. Sow. 

 Th. 1, p. 368, t. 73,/. 15, 6, 7.— Cra. R. Brit.Mol. 2,p. 366, t. 56,/. 7, 8. 

 Rounded-subquadrate, retuse above : upper valve depressed-conical, 

 smooth, not thick, either rufous-brown, reddish chocolate, or paler or 

 darker liver colour, else rayed with these hues on a paler ground ; 

 its upper scars large, its lower ones still larger, nearly confluent, each 

 divided by a few somewhat radiating, obscure, groove-like indenta- 

 tions : upper scars of the lower valve separate, ovate, almost linked 

 together in the middle ; lower scars large, ovate, and somewhat 

 angular above ; rostellum obtuse ; disk palmato-radiated ; margin 

 thickened, and somewhat scabrous. |...f. Scotland; N. Europe. 

 The apex is frequently submarginal. 



C. Rostrata. — Anomia Cranwlaris, Ch. (not Lin)f. 687,/. c, d. 

 — C R., Homing. Mon. Cran. p. 3,/. 3. — Besh. ed. Lam. 7, p. 302. — 

 Sow. Th. 1, p. 368, t. 73,/. 12, 13, 14. Lower valve rounded-sub- 

 trapeziform, nearly straight above ; upper scar orbicular ; lower ones 

 small, somewhat lunulate, united below ; rostellum small, rather 

 sharp ; disk with palmated and digitated impressions ; border granu- 

 lose, irregular and thickened below : upper valve thinner, white, 

 somewhat radiatingly rugose, internally with two elevated ridges 

 diverging from the centre towards the upper corners. £. Mediter- 

 ranean. 



DISCINA=ORBICULA. 



Suborbiadar, inequivalve, compressed, devoid of ligament or hinge : 

 upper valve depressed-conical, of a more or less horny substance, its 

 vertex nearly central; lower valve more or less flat, membranaceous, 

 perforated. 



D. (0.) Lamellosa. Brod. Z. P. 1833, p. 124; Z. T. 1, t. 28, 

 /. 3, 4, 5.— Besh. ed. Lam. 7, p. 318.— Sow. Th. 1, p. 365, t. 73,/. 1. 



Of a horny substance, nearly orbicular, rather depressed, chestnut- 

 brown, covered with elevated concentric lamellae ; disk of adhesion 

 oblong, close to the dorsal or upper edge, perforation oblong, placed 

 near the dorsal part of the disk. %. Peru, in groups. 



D. (O.) Lzevis. Sow. Tr. Lin. 13. — Sow. G. — Besh. ed. Lam. 7, 

 p. 317.— Reeve, t. 129, /. 1, 2.— Sow. Th. 1, p. 365, t. 73, /. 2, 3. 



