BY C. HKDLEY. 731 



in ascent from whorl to whorl, knotted at the shoulder and fading 

 at the base. Spirals occur as six prominent cords on the snout, 

 above which a dozen threads become fainter as they ascend, 

 traverse the interstices but not the ribs ; about six of these 

 ascend the spire. Aperture pyriform, lip simple. Columella 

 with four well developed, spaced, oblique plaits. Length, 9-5; 

 breadth, 4 mm. 



This is the form mentioned in the Thetis Report,* as a 

 variety of Mitra tasmanica Ten.-Woods. On reconsidering a 

 larger series, I now conclude that the northern shell is an in- 

 dependent species, readily separable by its sharp shoulder from 

 the real M. tasmanica, which does not extend to New South 

 Wales. 



Hab.—OS Cabbage-Tree (type) and Broughton Islands, 35 

 fathoms; Port Stephens (Museum Expedition of 1880); off Port 

 Kembla, 63-75 fathoms (Thetis); off Wollongong, 100 fathoms; 

 off Sydney, 250 fathoms; and off Narrabeen, 80 fathoms (self). 

 NoDOPELAGiA, gen.nov. 



A new genus of the Buccinidse. Shell very solid, fusiform, 

 with a short canal and longitudinal ribs. Type, Peristernia 

 brazieri Angas, Proc. Zool. Soc, 1877, p.l71, P1.26, fig.4. 



Loc. — Mouth of the Redbank River, N.S.W. 



Absence in P. brazieri, of the essential character, plaits on the 

 columella, excludes it both from the family and genus of Peri- 

 sternia, and brings it nearer to Cominella. 



Melvillf noted P. brazieri as a Peristernia of slightly doubtful 

 affinity, while Tryon transferred it to Latirus.l 



In literature, considerable confusion between the genera 

 Latirus and Peristernia has occurred. Tryon, for instance, con- 

 sidered that the distinction between them was entirely arbitrary. 

 Yet differential characters are shown by the radu]a.§ 



The type of Latirus is certainly L gibbulus Gmelin, but the 

 type of Peristernia is not so plain. The second of five species, 



* Hedley, Mem. Austr. Mus., iv., 1903, p. 372. 



t Melvill, Mem. Manchester Lit. Phil. Soc, (4), iv., 1891, pp.368, 385, 407. 



: Tryon, Man. Conch., iii., 1881, p.93. 



§ Cooke, in Melvill, op. cit., p. 376. 



