482 GASTROPODA. [Pectinibranchia. 



Diameter, 3-5 mm. ; height, 8 mm. 



Type in my collection. 



Hab. Near Cuvier Island, in 37 fathoms, type (Captain Bollons) ; 

 Snares, in 50 fathoms (Captain Bollons) ; Stewart Island, in 18 fathoms 

 (Captain Bollons). 



Subgen. 3. CYMATOSYRINX, Ball, 1889. 



Cymatosyrinx, Dall, Bull. Mus. Comp. Zool., xviii, 95. Type : Pleuroloma 

 lunata, Lea. Claims, Montfort, 1810 ; not Clava, Gmelin, 1790. 



Shell generally short and stout, the spire often very short ; whorls 

 with nodulous axial ribs, extending over the whole of the volutions, 

 generally without spiral sculpture, or, if present, very weak ; aperture 

 subrhomboidal, very little narrowed below, with a short and broad 

 canal ; outer lip arched, with a shallow sinus towards the suture ; 

 inner lip large and callous. 



10. Drillia lyallensis, Murdoch, 1905. Plate 21, fig. 9. 



Drillia lyallensis, Murdoch, T.N.Z.I., xxxvii, 1904 (1905), 221, pi. 7, f. 7. 



Shell small, fusiform, rather solid. Sculpture consisting of 11 to 12 

 low, strong, rounded, and slightly oblique axial ribs, rather wider than 

 the interspaces, obsolete on the base and usually on approaching the 

 outer lip ; spiral sculpture consists of minute strife, erased upon the 

 ribs, a few at the anterior end stronger, and frequently several rough 

 irregular ridges on the basal fascicle. Colour light or dark brownish- 

 red, or somewhat purple in somewhat beach-worn specimens. Spire 

 conical, with a lightly turriculated appearance, somewhat higher than 

 the aperture. Protoconch smooth, with a depressed nucleus. Whorls 

 6 to 6^, moderately convex, lightly contracted at the base. Suture 

 somewhat deep and undulating. Aperture narrowly rhomboidal, 

 subchannelled above, terminating in a short, broad, and slightly 

 twisted canal, not emarginate below. Outer lip slightly thickened, 

 flatly convex, and a little contracted towards the base, with shallow 

 rounded sinus below the suture. Columella lightly curved, narrowed 

 to a fine point at the left margin of the canal, excavated on meeting 

 the convex parietal wall. Inner Up rather narrow, smooth, not very 

 thick. Operculum unknown. 



Diameter, 4-6 mm. ; height, 12 mm. 



Animal unknown. 



Type in the Dominion Museum, Wellington. 



Hab.Ly-A\\ Bay, type (C. Freyberg) ; Hauraki Gulf (H. S.) ; Bay 

 of Islands. 



Remark. In sculpture the species most resembles Mangilia Sin- 

 clairi, E. A. Smith. 



