SMITH : ON THE GENUS ASTARTE. 227 



longer ; ligamental area less angulated ; anterior lateral tooth in 

 the right valve more prominent. Long. .4, lat. .33, div. .21. 



16.— ASTARTE LONGIROSTRA D'Orbigny. 



1847. A. longirostra D'Orb. Voy. Amer. Merid., vol. v., 



p. 576, pi. Ixxxiii., f. 21 — 4. 

 1854. A. longirostra Gray. Cat. Coll. d'Orbigny in Brit, 



Mus., p. 70. 

 1859. Crassina longirostra Chenu. Man. de Conch., 



vol. ii., f. 617. 

 1872. C. longirostra Tryon. Proc. Acad. Nat. Sci. Philad., 



1872, p. 247. 



Habitat. — Isles Malouines (Falkland Isles). 



1 7.— ASTARTE MAGELLANICA Smith. 



1881. A. magellanica Smith. Proc. Zool. Soc, 1881, p. 41, 

 pi. v., f. 7. 



Habitat. — Straits of Magellan, 



This species is smaller than the preceding, of a paler colour, 

 more coarsely ribbed, with much less acuminated and anteriorly 

 inclined beaks, and the inner margin of the valves is crenulated, 

 a feature not yet noticed in longirostra. 



18.— ASTARTE TRIANGULARIS Montagu. 



1803.. Mactra triangularis Montagu. Test. Brit., vol. i, 



p. 99, pi. iii., f. 5. . , 



1803. M. minutissima, id.. I.e., SuppL, p. 37. 

 1807. M. triangularis Maton and Rackett. Linn. Trans, 



vol. vii., p. 72. 

 1817. M. triangularis Dillwyn. Cat, vol. i., p. 143. 

 1817. M. minutissinna, id., I.e., p. 143. 

 1819. IVi. triangularis Turton. Conch. Diet, p. 82. 



