TRIBE MACTRACEA. 27 



lanceolate,. solid, white, tapering anteriorly oblique : slightly gaping 

 anteriorly; a distinct lozenge, edged with a raised line ; anterior 

 lateral teeth wanting in the adults. — Prince of Wales' Island. 



L. Ensis. Quoy. Ast.t. 83. f 5, 6. Elongated-ovate, narrow, 

 transverse inequilateral, arcuated, yellowish-grey, with irregular 

 transverse grooves ; anterior side rounded and very short. 3. — N. 

 Zealand. 



* * Orbicular or sub -triangular. 



L. Compressa. Lam. 4. — L. Piperata. Lam. 5. — Bl.t. 77. 

 f. 2.— Mactra Piperata. Gmel. 3261.— D. p. 142.— Ch.f. 21. 

 — E. t.257.f. 4.— M. Listeri. W. t. 6./. 25.— Tellina Plana. 

 Don. t. 64./. 1.— Ligula C. Mont. p. 96.— Listera C. Turt. 

 JB. p. 51. t. b.f 1. Thin, compressed, triangularly rounded, 

 yellowish-white, finely but irregularly striated transversely, semi- 

 pellucid ; beaks very small and central ; a distinct lozenge, edged 

 with a raised line ; a single tooth in one valve looking into a bifid 

 one in the opposite, no lateral teeth. \\...\\. — Europe. 



L. Tellinoides. Lam. 6. — Deles, t. 3. f. 5. Ovate, sub- 

 triangular, thin, pellucid, white, with fine, unequal, transverse, striae; 

 posterior side short, obliquely truncated, and somewhat plaited. 1 . 

 — Guinea P 



L. Candida. Lam. 7 . Ovate, thin, pellucid, white, with un- 

 equal transverse striae : posterior side the longer. 



L. Papyracea. Lam. 8. — Sow. G. — Reeve, t. 41. f. 2. — 

 Mactra Recurva. W. S.f. 2. — An. L. Lineata. Say. Am. 

 Conch, t. 9. Roundish-ovate ; thin, pellucid, transversely striated, 

 with very fine longitudinal striae in an isolated place near the 

 anterior side, which is widely gaping and marked with an elevated 

 longitudinal line on each valve. — Indian Ocean. 



L. Plicatella. Lam. 9. — An. Mactra Papyracea Gmel. 

 3257 1—D. p. 133 1—Ch.f. 231 ? Ovate-rounded, thin, pellucid, 

 white, with numerous fine transverse plaits ; anterior side short and 

 sub-angulated. — iV. America* 



1 This species is in all probability the Tellina Angulata of Lin- 

 naeus, whose own specimens are undoubtedly Lutrariae. I have given 

 copies of Delessert's figure of Tellinoides and Wood's Angulata. 



T. Angulata. Lin. — Ch.f. 75. — D. p. 75. — Wood, G. C. p. 

 146. t. 43. f. 1. — W.t. 3f. 5. Triangular-ovate, anteriorly much 

 shorter, bent and angulated ; white, sub-inflated, nearly smooth, ven- 

 tral edge but little curved, ligament very small ; no lateral teeth. 



2 It is not absolutely impossible, that this at present rather doubt- 

 ful species, may prove to be identical with the 



L. Canaliculata. Say Jour. A. N. S. Phil. 2. p. 311. — 

 Mactra Campechensis. Gray in W. S. t. 1. f. 3. — An. 



