362 HECOKDS OF TllK AUSTRALIAN MUSKL'M. 



Leda FORTIS, hJ). tlOV. 



(Plate Ixvi., fig. 2, 3). 



Shell small, solid, smooth, nearly equilateral, subtriaiigular, 

 rather inflated. Colour cream. Sculpture delicate growth lines. 

 Rostrum short and bnmd, with an angular ridge. Dorsal mar- 

 gins meeting at an acute angle. Anterior and \entral margins 

 rounded. Hinge with t^velve teeth on each side. Height, 3-7 ; 

 length 4 2 ; depth of single valve, 1 45 mm. 



Several .separate valves. 



This species appears to belong to the sub-genus Jiqyltfria.^'' 



NUCULA DILECTA, Smith. 



Niiciila dilecfd,, Smith, Pi'oc. Zool. Soc, 1891, p. 442, pi. xxxv., 

 f. 23. 



Of common occurence in the vicinity of the type locality is a 

 Nncnla which coincides with the account of Nucida dilecta and 

 which is accordingly identified as such. But this involves adding 

 ..y. ddecUi to the synonomy of Nucjda ohliqua, Lamarck, the 

 nomenclature of which was discussed in dealing with the 

 "Thetis" mollusca.1*^ 



CUSPIDARIA ALVKATA, SJ). UOV. 



(Plate Ixvi., fig. 6). 



Shell much infiated, nearly equilateral, umbo prominent, dorsal 

 margin rather straight, anterior perpendicularly truncate, ventral 

 I'ounded, posterior scarcely sinuate, rostrum hardly apparent. 

 Colour cream. Sculpture, medially there are faint radiating 

 impressed lines which vani.sh on th(; anterior quarter, but pos- 

 teriorly gradually pa.ss into deep and wide furrows. These fur- 

 rows notch the maigin and are parted by sharp elevated ribs of 

 v/hich about ten are stronger than the rest, the broadest furrows 

 contain each a small intei'stitial riblet. Except the smooth umbo 

 the whole surface is over-run by fine close concentric threads 

 which bead the crests of the ribs. Length, 9 5 ; height, 8 ; depth 

 of single valve 3 mm. 



A single valve and a few fragments were procured. 



" Sacco— iloll Terr. Tert. Piedmont , pt. xxYi.,1898, p. 5(5. 

 "* Hedley— Mem. Austr. Mus., iv., 5, 1902, p. 292. 



