of new south wales. 317 



25. — Cerithium bicanaliferum. n. sp. 



Shell thin, elevated, white or brown, spirally encircled in the 

 centre with darker brown; whoi'ls 14, flat with transverse 

 lengthened nodules, the centre raised in the form of longitudinal 

 ribs and crossed with a fine spiral line, sometimes two ; suture 

 excavated, rather wide and deep, having a spiral line, body whorl 

 with a rounded varice on the left side of the aperture ; strongly 

 transversely striated below the periphery ; spire produced; apex 

 acute; aperture pear shaped; columella slightly twisted; flesh 

 tinged inside, below white ; canal short, narrow, slightly turned to 

 the left ; outer lip thin at the lower part, spotted with brown on 

 the edge, the upper part thickened behind like a varice, with a 

 moderately wide and deep canal or sinus, and joined to the upper 

 part of the body whorl. 



Length 5 ; breadth from each side 1| lines ; above last whorl 

 1| lines. 



Length from upper to lower canal 1| lines; breadth of aperture 

 | lines. 



Hob. Darnley Island, Torres Straits, 30 fathoms, white sand 

 bottom. Eight specimens of this interesting new species were 

 found; it partakes very much of the character of the Pleurotomidae 

 by having the sinus at the upper part of the peristome. 



26. — Cerithium minimum, n. sp. 



Shell pyramidal, pale brown ; whorls 10, flat; suture excavated, 

 longitudinally ribbed, transversely lined in the interstices ; spire 

 produced ; apex acute, pink ; last whorl strongly spirally keeled 

 with 7 keels; interstices minutely striated ; large white rounded 

 varice on the left side; columella bright brown, slightly twisted at 

 the lower part; canal wide, short; aperture oblong ovate; peristome 

 thin, expanded at the lower part, thickened behind in the centre, 

 with a varice contracted above, having a small sinus. 



Length 2| ; breadth -| lin. 



Hob. Darnley Island, Torres Straits, 15 fathoms, sandy mud 

 bottom. Ten specimens were found ; some of a pale brown, others 



