266 TESTACEOUS MOLLUSCA. 



L. Tenera. Ch. f. 652.— Sow. Th. p. 84. t. 21. /, 2, 3, 10, 11, 

 13. — L. Glacialis var. Lam.—E. t. 206. /. 3.— Ostrea G. D. 

 p. 272. — W. t. 11./. 56. Extremely like the last but with most 

 minute ribs, the scales very minute, erect and interrupted. Var. 

 A. Oval. . .Var. B. Rather elongated {Isle of Mindoro) Var. 

 C. Obliquely subtriangular, (Philippines, Singapore.) 1,5.. 1,2. 

 The difference bt tween this and the preceding consists in the com- 

 parative fineness of the notched ribs; when in good condition they 

 produce small erect seed-like terminations to the notches. l 



L. Bullata. Sow. G.f. 3. — Reeve Sys. t. 112./. S.—E. t. 206. 

 /. 6.— Sow. Th. 84. t. 22. f. 32,3.— Ostrea B. Born. p. 110. t. 6. 

 /. 8.—D. p. 270.— Ch. f 649.— L. Fragilis. var B. Lam. 5. 

 Elongated-oval, thick, ventricose, subequilateral, scarcely gaping 

 at the sides ; hinge margin thick, with a plication under the auricles 

 which are thick sharp and nearly equal ; about twenty nodose cen- 

 tral ribs, and others less strongly raised at the sides. 1,40. . 0,84. 2 



L. Squamosa. Lam. 2. — Sow. G. f. 2. — Reeve t. 112. /. 2. — 

 Phil. p. 77.— Sow. Th.t. 21. f. 1,18.— Ostrea Lima Lin. 1147. 

 — Lin. Mus. Ulric. p. 532.— D. p. 271.— Pol'/. 2. t. 28. /. 22,3,4. 

 —Ch.f. 651.— E.t. 206. f. 4>.—Born.p. 109.— W. t. 11./. 54.— 

 Kn. 6. t. 34./ 3. Thick, oblique, rather compressed, slightly ga- 

 ping on both sides, posterior side angularly flattened ; anterior au- 

 ricles large, posterior comparatively small : ribs twenty to twenty 

 four, thick, round, with sharp erect imbrications ; hinge area large 

 Mediterranean. — Var. from Red Sea. More oblique, scales sharper 

 and more numerous. 1,50. . 1,16. 



L. Multicostata Sow. Th. t. 22. f. 38. p. 85. Closely resem- 

 bling Squamosa but the ribs about thirty-five, moniliform and less 

 raised. 1,50.. 1,16. Mediterranean? 



L. Paucicostata. Sow. Th. p. 85. t. 21. /. 14, 17. Very like 

 Squamosa but with only twelve or thirteen ribs whose scales are 

 large and much elevated. 1. . 0,90. 



1 M. Deshayes states from an examination of the type of L. An- 

 nulata. Lam. 4. that it is a young variety of this species. 

 Lamarck's description is as follows. "Obovate, subequilateral, the 

 extremely delicate longitudinal striae decussating the distant erect 

 annular transverse ones. Lsle of France. 1. Allied to Glacialis. 

 ( Tenera) both in shape and in the lips of its posterior gape. 



2 The L. Subauriculata (Turt. Biv.p. 218. — El. p. 388.— Sow. 

 Th. t. 22. f. 23.— Ostrea. S. Mont. Sup. t. 29. /. 2.— W. S. t. 2. 



f. 5. — Turt. Die. p. 131.) scarcely differs except in its minuteness 

 and the extreme fineness of its ribs. 



