198 



Locality. — 20 fathoms, outside Backstairs Passage, with 

 six other examples, dead. 



Diagnosis. — From L. arenacea^ Pritchard and Gatliff ; 

 in its marked carinae, more widely canaliculated suture, and 

 wider umbilicus. From Liotia alazon, Hedley, in being a 

 smaller shell, with less valid carinae, and in its radial in- 

 cisions, 



Cuspidaria dorsirecta, n. sp. PI. xi., figs. 9 and 10. 



Shell small, moderately solid, oval, equilateral. Umbo 

 prominent, acute, prosogyre. Post-dorsal line straight; ante- 

 rior concave in front of the apex, then straight ; the front end 

 uniformly widely curved, ventral border gently curved, with 

 very slight incurving at the base of the rostrum, which is very 

 short and wide. Well-marked granulated ridge from the umbo 

 to the postero-inferior angle of the rostrum ; a second ridge 

 cuts off its upper fourth. In front of the former is a mode- 

 rate depression. Surface smooth but for sublenticular accre- 

 mental striae. It has one anterior and one posterior lateral 

 tooth well developed, roundly-triangular ; the latter slightly 

 the larger, and from its end a very low but gradually rising 

 lamina is continued nearly to the end of the rostrum, and 

 forms a narrow, slightly-widening groove with the dorsal 

 margin. 



Dim. — Antero-posterior diameter, 5 mm.; umbo-ventral, 

 3-3 mm. 



Locality. — Off Beachport, from 40, 100, and 110 fathoms; 

 off Cape Borda, 60 fathoms ; valves. 



Cuspidaria alta, n. sp. PI. xiii., figs. 8 to 11. 



Shell small, thin. Umbo tumid, blunt. Anterior dorsal 

 border very faintly convex sloping; posterior dorsal border 

 concavely sloping. Anterior end sharply rounded ; posterior 

 moderately and broadly rostrated. Ventral border uniformly 

 widely arcuate, running concavely into the rostrum. An 

 oblique, gradually-widening depression between the body and 

 the rostrum, and an oblique ridge between its lower angle and 

 the umbo ; there is a second ridge close to the median line, 

 the intervening space nearly flat. Outer surface smooth, but 

 for sublenticular concentric striae, which are much more 

 marked on the rostrum. Right valve with an anterior and 

 posterior triangular lateral tooth, the latter the larger, and 

 its groove running some distance into the rostrum. Left 

 valve edentulous, and lies within the margin of the right. The 

 pallial line e-nds by a nearly vertical curved line from the 

 umbo. 



Dim. — Antero-posterior diameter, 6*8 mm. ; umbo-ventral, 

 4 mm. 



