272 OSTREA. 



glacialis. 55. Shell ovate, flattish, with near an 

 hundred narrow scaly ribs, and the scales 

 depressed and imbricated ; margin entire. 

 Ostrea glacialis Var. Gmelin, p. 3332. 

 Ostrea sagrinata Var. Solanders MSS. 

 Ostrea glaciata. Llysses's Travels, p. 495. 

 Ostrea, No. Go- Schroeter Ei?il. iii. p. 332. 

 Lima tenera. Chemnitz, vii. p. 352. t. 68. f. 652. 

 Lima. Enc. Method, t. 206. f. 3. 



Inhabits the coa?ts of St. Domingo. D'Avila. Curagoa. Gro- 

 norius. St. Thomas. Chemnitz. Bay of Naples. Ulysses. 



Shell about two inches and a quarter long, and rather more than 

 an inch and a half broad ; thin, brittle, pellucid, aud of a 

 brownish white colour ; it has one of the auricles turned up 

 and thickened towards its margin as in O. Scubra, from 

 which it differs in being thinner, in having the ribs much more 

 numerous and filiform, and their scales not elevated. 



excavata. 56. Shell oval, ventricose, with nume- 

 rous slightly undulated ribs, and remote 

 transverse wrinkles ; margin very entire. 



Ostrea excavata. Fabricius. Chemnitz, vii. p. 355. t. 68. 



f. 654. Gmelin, p. 3332. 

 Ostrea, No. 26. Schroeter Einl. iii. p. 333. 

 Lima. Enc. Meth. t. 206. f. 1.2 



Inhabits the coasts of Norway. Fabricius. 



Chemnitz mentions two specimens, of which one measured five 

 inches and a quarter, by three inches and ten lines, and the 

 other four inches and ten lines by three inches and a half; the 

 umbones are placed near one extremity of the straight upper 

 margin which contains the hinge, and the hinge is said to 

 consist of a triangular excavated oblique fossule ; the colour 

 is white. 



# * * * Valves coarse and rugged. 



malleus. 51. Shell oblong-linear, flexuose, dis- 

 torted, with a transverse lobe on each side of 

 the hinge. 



Ostrea Malleus. Einn&us Syst. Nat. p. 114". Born Mus. 

 p. 111. Chemnitz, viii. p. 8. t. 70. f. 655 and 656. 

 Schroeter Einl. iii. p. 358. Gmelin, p. 3333. Barbut's 

 Perm. p. 55. t.9. f. I. Brooks's Introd. p. 77. t. 4. f. 39. 



