GASTROPODA. 3(59 



the base about 6 to 8 litre are much more prominent than the others ; 

 the spire-whorls are carinated at the middle, the body-whorl is bi- 

 carinate, the lower carina, beginning at the suture, less pronounced : 

 the axial sculpture consists of slightly oblique low ribs, to which cor- 

 respond sharply elevated nodules on the keels, but th<e ribs are not 

 continued over the base ; the growth-lines are well marked, and in 

 some places reticulate the spiral sculpture. The colour varies from 

 yellowish - white longitudinally streaked with brown to brownish- 

 purple. Epidermis thin, persistent, olivaceous. Spire conic, less than 

 the height of the aperture with canal ; outlines straight. Protoconch 

 conic, the apex but slightly deviated from the axis, of 3| convex 

 whorls, which are smooth, except the last half-turn, which is axially 

 costate. Whorls about 10. first very slowly then more rapidly in- 

 creasing ; the spire-whorls are flat or slightly concave above and 

 below the carina ; the body-whorl straight between the two keels, 

 base somewhat contracted. Suture superficial, undulating. Aperture 

 oblique, angled above and on the outer lip. produced below into a short 

 widely open canal, which is oblique and slightly turned backward ; 

 its base sinuated. with a distinct fasciole on the outside below the 

 pillar. Outer li/> sharply angled, thin and sharp, distantly finely lirate 

 within. CohtmeUa vertical, almost straight, arcuate, on the junction 

 with the parietal wall. Inner lip rather thickly callous, spreading 

 somewhat beyond the columella, forming a thick white callosity on 

 the parietal wall, narrowed below and forming the inner rounded 

 margin of the canal. Operculum oval, sharply pointed, the nucleus 

 apical ; growth-lines very distinct. 



Diameter, 21mm.; height, 40mm.: angle of spire, 55. Dia- 

 meter, 35 mm. ; height. 63 mm. (large specimen). 



Dentition. Hutton, T.N.Z.I.. xv, 119, pi. 13, f. G. 



Type lost. 



Hah. North and South Islands, but not south of Banks Peninsula, 

 below tide-marks ; Auckland Harbour, occasionally washed up ; near 

 Channel Island, Hauraki Gulf, in 25 fathoms ; a few miles west of 

 Cuvier Island, in 44 fathoms (Captain Bollons) ; oft' Great Barrier 

 Island, in 110 fathoms ; Manawatu coast ; Cook Strait ; Queen 

 Charlotte Sound, in 16 fathoms (Captain Bollons), in JO fathoms 

 (" Challenger " Exp.) ; off New Brighton, in 12 fathoms (H. S.) ; 

 Akaroa Harbour, in 2 to 8 fathoms (H. S.). Brought to England by 

 Captain Cook. 



Fossil in the Miocene and Pliocene. 



Subgen. 2. PENION, P. Fischer, 1884. 



Penion, P. Fischer, Man. de Conch., <>2i5. Type : tiiphoiui1in di!nfl<t. 

 Q. & G. 



Shell usually large, fusiform, the protoconch smooth, paucispiral, 

 slightly bulbous, nucleus deviated : whorls angled, ornamented with 



