258 PEOCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



longitudinal flat bar, leaving a triangular groove on each side of the 

 middle ; inner face convex, the central part with a broad longitudinal 

 median groove. The outer layer of these plates consists of calcium- 

 carbonate, the inner and greater part is chitinous, insoluble in acid 

 and alkali. 



The length of the animal figured is 20 mm,, that of the gizzard 

 plates 5 mm. 



E,adula having the formula 1-0-1. There are about twenty 

 longitudinal rows of teeth (Fig. 16), falciform, light brown, finely 

 serrate at the inner lower edge, the denticles simple. 



Sal. — Akaroa Harbour, in 4-6 fathoms; type (H. S.). Wet Jacket 

 Arm, near Resolution Island, in 12 fathoms (Captain J. Bollons). 

 Dredged on sandy flats, Eangitoto Channel (Cheeseman). 



The sculpture is exactly like that of the species (Trans. X.Z. Inst., 

 vol. xxxviii, p. 278), but the form of the shell is different, not 

 contracted above. It seems to me very probable that if series of these 

 molluscs, obtained at different localities and from various depths, could 

 be examined, intermediate forms would be forthcoming ; however, 

 with the scanty material at my disposal, I consider it preferable to 

 keep the two forms separate for the present. The sculpture alone 

 suffices to distinguish the shell from P. Anqasi, Crosse, and F. aperta, L. 



No doubt Philene teres, Hedley, recommended by Webster to be 

 added to Fauna List (Trans. ]S".Z. Inst., vol. xxxvii, p. 280), is not 

 Hedley's species at all, but this subspecies. Type in my collection. 



SiPHONAEiA. Cooe:iana, n.sp. PI. XI, Fig. 18. 



Shell small, solid, oval, depressed, conoidal, radiately ribbed, with 

 subcentral apex. Sculpture consisting of about seventeen smooth, 

 rounded primary ribs, extending from the summit to the margin, the 

 interstices with one, rarely two or three, secondary riblets, which do 

 not reach the apex ; the anterior primary rib above the siphonal groove 

 is thicker than the others and divided by a median groove ; growth- 

 lines fine, close, concentric. The riblets are sometimes projecting 

 a little at the margin. Colour black, the riblets white on approaching 

 the base, but usually the shell is greyish- white, the interstices dark 

 brown ; interior purplish-brown, polished, the groove white, usually 

 with a broad oval white spot at the centre, the margin white or white 

 and brown. Apex sharply rounded, more or less eroded, situate 

 a little behind the middle and to the left ; slope lightly convex all 

 round. Interior with the muscle-scar horseshoe-shaped, interrupted 

 on the right side by the shallow groove. Margin sharp, lightly 

 laciniate. Diam. 9, length 12, height 4"5mm. 



Hab. — Lyall Bay, Cook Strait ; type (Miss Mestayer). Preservation 

 Inlet, South Island. 



It is allied to 8. exulorum^ Hanley, from Norfolk Island, which, 

 however, is a thinner, more depressed species, with more numerous 

 riblets, and without the interior white central spot and the white 

 groove. S. amara, Nutt., from New Guinea, is also a near relation, 

 but also with more numerous riblets and devoid of the central white 

 spot. Type in my collection. 



