MOLIA'SCA -IlKDI-KV. 



385 



embryonic iipcx. Srulptuic: cxcci.t (lie prickles and ridges, the 



whole surface is microscopii-ally -.'ranulatrd ; ton sharp projecting 



ladial ribs, interrupted l)y the 



broad anal fasciole, ascend Ihe 



spire oljlitjuely ; along the ix'ri- 



phery of each Av]u)rl runs a 



l)road spiral shelf, beneath it 



are two similar but lesser 



spirals, the lowest of which is 



half buried in the suture, and 



above it are three rapidly and 



successive!}' diminishing spirals; 



these radials and spirals enclose 



deeply sunk lozenges, at the 



point of intersection upwardly 



directed prickles arise ; the 



anal fasciole is marked with 



crescentic stria^ ; on the base 



and canal are a dozen spiral 



threads. Apex of five whorls 



sharply differentiated from the 



adult shell, sculptured with 



close delicate, crenulate, radial riblets. Slit sutural, broad and 



deep. Aperture pyriform, narrowing gradually to the canal, lip 



sharp, no callus on the columella. Canal very long, open, sinuate. 



Length, 10 mm. ; breadth, 4 mm. 



The prickly sculpture, deep sutural slit, slender recurved canal 

 and peculiar apex, distinguish this from any other Australian 

 Pleurotomoid. Some features of it recall the American Ancistro- 

 syriiix. 



My drawings show a shell not quite adult, the sinus of an adult 

 but broken specimen, and the apex of a third individual. 



A few specimens were procured in 63-75 fathoms off Port 

 Kembla; off Botany Bay in 50-52 fathoms; and one off Cape Three 

 Points in 41-50 fathoms. Another was obtained by the Australian 

 Museum Expedition in 1880 off Cabbage Tree Island, Port 

 Stephens, in 24 fathoms. The species also occurs in Torres Straits. 



Fig. 97. 



BATHYTOMA, Harris c& Burrows. 



BATHYTOMA BTCONICA, sp. nov. 



(Fig. 98.) 



Station 52. 



Shell solid, biconical, slightly angled at the shoulder, of more 

 than six whorls. Colour apparently flesh-tint. Sculpture : 



