MOLLUSCA EAST OF CAPE BYKON. 



Fior. 10. 



Limea acclinus. 



tuiv of alxHit forty narrow sharp radiating ribs, most prominent in 

 the centre, where they strongly denticulate the margin, gradually 

 vanishing at the sides; in the groove between each a row of minute 

 prickles. At intervals concentric 

 zones mark rest stages of growth. yj^jv-w^^^ 



Prodissoconch smooth, sliarply 

 defined. Hinge line short, with 

 a broad, shallow central pit, and 

 three or four feeble teeth radia- 

 ing from each eiid. Interior 

 slightly grooved by external rib- 

 bing. Height, 9-6 mm.; length, 

 6 mm. : depth of single ^•alve, 

 2'5 nnii. 



Tlie thin, inequilateral shell 

 readily distinguishes this from 

 other Australian species which 

 have been referred to this genus. 

 It was also taken by jSIi'. Halli- 

 gan and myself in 100 fathoms 

 off Wollongong ; and again re- 

 cently by Mr. W. F. Pettei-d and 

 myself in 300 fathoms, twenty seven and a half milos east of Port 

 Jackson Heads. It seems a characteristic species of this zone. 



CUSPIDARIA TRUNCATA, 



(Fig. 11). _ 



Shell small, thin, rather convex, trapezoidal, very inequilateral ; 

 dorsal mai'gin straight, the length of the shell ; posterior side 

 oblique sinuate ; ventral margin slightl}' rounded ; anterior side 

 abruptly truncate. Colour white. Sculpture, of delicate spaced 

 lamella?, obsolete anteriorly, developed most on the rostrum, on 

 either side of which they form scales. Between the lamellse are 



fine hair lines. Rostrum 

 blunt, short, broad, running 

 up as a flat wedge towards 

 the umbo. A broad, shallow 

 furrow runs from the apex 

 beneath the rostrum to the 

 dorsal margin. Prodisso- 

 conch smooth, distinct. In- 

 terior smooth, muscle scars 

 indistinguishable. No la- 

 teral teeth ; a small car- 



Fi^. 11. dinal tubercle under the 



Cuspidarid fruncata. 



S]). 



