bilocularis, _Linn._ Syst. Nat. Pinna inflata, _Chamn_. Conch. Cab. cancellata, _Mawe_, Intr. Lin. Conch. Malleus vulgaris, _Lam._ Anim. s. Vert. albus, _Lam._ Anim. s. Vert. Meleagrina margaritifera, _Linn._ Syst. Nat. vexillum, _Reeve_, Conch. Icon.[15] Avicula macroptera, _Reeve_, Conch. Icon. Lima squamosa, _Linn._ Anim. s. Vert. Pecten plica, _Linn._ Syst. Nat. radula, _Linn._ Syst. Nat. pleuronectes, _Linn._ Syst. Nat. pallium, _Linn._ Syst. Nat. senator, _Gm_. Syst. Nat. histrionicus, _Gm_. Syst. Nat. Indicus, _Deshayes_, Voyage Belanger. Layardi, _Reeve_, Conch. Icon. Spondylus Layardi, _Reeve_, Conch. Icon. candidus, _Reeve_ (as of _Lam._) C. Icon. Ostrea hyotis, _Linn._ Syst. Nat. glaucina, _Lam._ Anim. s. Vert. Mytiloides, _Lam._ Anim. s. Vert. cucullata? var., _Born_, Test. M. Vind.[16] Vulsella Pholadiformis, _Reeve_, C. Icn. (immat.) Placuna placenta, _Linn._ Syst. Nat. Lingula anatina, _Lam._ Anim. s. Vert. [Footnote 1: P. cærulesens, _Lam._] [Footnote 2: Sanguinolaria rugosa, _Lam._] [Footnote 3: T. striatula of Lamarck is also supposed to be indigenous to Ceylon.] [Footnote 4: T. rostrata, _Lam._] [Footnote 5: L. divaricata is found, also, in mixed Ceylon collections.] [Footnote 6: C. dispar of Chemnitz is occasionally found in Ceylon collections.] [Footnote 7: C. impudica. _Lam._] [Footnote 8: As Donax.] [Footnote 9: V. corbis, _Lam._] [Footnote 10: As Tapes.] [Footnote 11: V. textile, _Lam._] [Footnote 12:?Arca Helblingii, _Chemn._] [Footnote 13: Mr. Cuming informs me that he has forwarded no less than six distinct _Uniones_ from Ceylon to Isaac Lea, of Philadelphia, for determination or description.] [Footnote 14: M. smaragdinus, _Chemn._] [Footnote 15: As Avicula.] [Footnote 16: The specimens are not in a fitting state for positive determination. They are strong, extremely narrow, with the beak of the lower valve much produced, and the inner edge of the upper valve denticulated throughout. The muscular impressions are dusky brown.]