REPORT ON THE LAMELLIBRANCHIATA. 237 



Leda crassa (Hinds). 



Nucula crassa, Hinds, Proc. Zool. Soc. Lond., 1843, p. 99. 



Leda crassa, Hanley, in Sowerby's Thes. Conch., vol. iii. p. 120, pi. ccxxviii. fig. G9. 



Leda crassa, Angas, Proc. Zool. Soc. Lend., 1877, p. 193. , 



Lteda crassa, Sowerby, Conch. Icon., vol. xviii. pi. v. fig. 27. 



Habitat. — Station 161, oft' the entrance to Port Philip, South Australia, in 38 

 fathoms (Challenger) ; Australia (Hinds) ; Port Jackson Heads, in 25 fathoms (Angas) ; 

 Van Diemen's Land (Mus. Cuming). 



A single valve only, half the length of that figured by Hanley, is all that was 

 dredged oft' Port PhilijD. It undoubtedly belongs to the same species as the type and 

 two specimens from Sydney presented to the British Museum by Mr. Angas. 



Leda messanensis, Seguenza. 



Leda acuminata, Jeffreys, Ann. and Mag. Nat. Hist., 1870, vol. vi. p. 69. 



Leda acuminata, Seguenza, Atti R. Accad. dei Lincei. Mem., 1877, vol. L p. 1175, pi. iii. 



figs. 15-15e. 

 Leda messanensis (Seguenza, MSS.), Jeffreys, Proc. Zool. Zoc. Lond., 1879, p. 576. 



Habitat. — Station 75, off Fayal, Azores, in 450 fathoms ; and Station YHL, off 

 Gomera, Canaries, in 620 fathoms. 



The largest specimen from Station 75 is 7 mm. in length, showing that the species 

 attains a considerably larger size than the dimensions given by either Jeffreys or 

 Seguenza. 



? Leda rectidoy.'iata, Seguenza. 



Leda (Jtmonia) rectidorsata, Seguenza, Atti R. Accad. dei Lincei Mem., 1877, vol. i. p. 1176, 

 pi. iv. figs. 19-1 9 A 



Habitat. — Station II., Setubal, in 470 fathoms. 



A single valve from this locality agrees so closely with fig. 19?> in Seguenza's work, 

 that I cannot find any grounds for separating it. 



Leda novce-guineensis, n. sp. (PI. XIX. figs. lO-lOo). 



Testa elongato-ovata, postice acuminata, unicarinata, carina aream dorsalem circum- 

 dante, antice anguste rotundata, sequilateralis, alba, modice convexa, concentrice striata, 

 striis paulo post medium fere evanidis, antice prope extremitatem acutam paulo flexuosis. 



