266 TESTACEOUS MOLLUSCA. 
L. Tenera. Ch. f. 652.—Som. Th. p. 84. t. 21. f, 2, 8,10, 11, 
13.—L. Guactatis var. Lam.—E. t. 206. f. 3.—Ostrea G. D. 
p. 272.—W. t. 11. f. 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 between 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. Buriata. Son. G. f. 3.—Reeve Sys. t.112.f. 3.—E. t. 206. 
f. 6.—Som. Th. 84, t. 22. f. 32,3.—Ostrea B. Born. p. 110. t. 6. 
Sf. 8.—D. yp. 270.—Ch. f. 649.—L. Fraeitis. var B. Lam. 5 
Elongated-oval, thick, ventricose, subequilateral, scarcely gaping 
at the sides; hinge margin thick, witha 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.? 
L. Savamosa. Lam. 2.—Sow. G. f. 2.—Reeve t. 112. fi 2.— 
Phil. p. 77.—Son. Th. t. 21. f. 1,18.—Ostrea Lima Lin. 1147. 
—Iin. Mus. Ulric. p. 532.—D. p. 271.—Poli. 2. t. 28. f. 22,3,4. 
—Ch. f. 651.—E.t. 206. f. 4.—Born. p. 109.—W. t. 11. fi 54.— 
Kn. 6. t. 34. f. 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.—V ar. from Red Sea. More oblique, scales sharper 
and more numerous. 1,50.. 1,16. 
L. Mutticostata 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. Pavcicostata. Sow. Th. p. 85. t. 21. f. 14,17. Very like 
Squamosa but with only twelve or thirteen ribs whose scales are 
large and much elevated. 1.. 0,90. 

''M. Deshayes states from an examination of the type of L. An- 
nutaTaA. Lam. 4. that it is a young variety of this species. 
Lamarck’s description is as follows. ‘‘Obovate, subequilateral, the 
extremely delicate longitudinal striz decussating the distant erect 
annular transverse ones. Isle of France. 1. Allied to Glacialis. 
(Tenera) both in shape and in the lips of its posterior gape. 
i ree L. Supauricutata (Turt. Biv. p. 218.—Fl. p. 388.—- Sow. 
Th. t. 22. f. 23.—Ostrea. S. Mont. Sup. t. 29. f. 2.—W. S. t. 2. 
f. 5.—Turt. Dic. p. 131.) scarcely differs except in its minuteness 
and the extreme fineness of its ribs. 
