168 GASTROPODA. [Aspidobranfhia. 



Inner lip spread widely in a semicircle as a thin transparent glaze 

 over the base, connecting the margins. Umbilical area deeply concave, 

 bounded by a half-circular thread, which on reaching the lower part 

 of the columella produces an indistinct tubercle. Operculum brownish 

 or white outside. 



Diameter, 65-90 mm. ; height, 65-80 mm. 



Dentition. Troschel, Das Gebiss d. Schnecken. ii, 127, pi. 20, 

 f. 14 ; Hutton, T.N.Z.I., xv, 125, pi. 14. f. P. 



Hob. North and South Islands, as far south as Oamaru ; Ch; it- 

 ham Islands. At low-water mark, and down to a few fathoms, mostly 

 in exposed situations. Spengler and Chemnitz give the habitat Dusky 

 Bay and Cook Strait. Brought to England by Captain Cook. 



Maori. Toitoi ; ngaruru (fide Captain Bollons). 



Subsp. Davisii, Stowe, 1872. Plate 41, fig. 3. 



Imperator Davisii, Stowe, T.N.Z.I., iv, 1871 (1872), 218. Antrallum Hiilcntmii, 

 Mart., subsp. Davisii, Stowe : Suter, T.N.Z.I., xxxviii, 325. Turbo Cooki, 

 Lam., Voy. Astrol., iii, 224, pi. 60, f. 19-23. Risella Jcielmansegi, Zelebor, 

 Verhaudl. Zool. Bot, Gesellsch. Wien, xvi, 1866, 913. R. aurata, 

 Q. & G. : Hutton, J. dc Couch., 1878, 27, not of Q. & G. . melano- 

 stoma, Gmel. : Hutton, M.N.Z.M., 79; Suter, T.N.Z.I., xxxiv, 215, 

 not of Gmelin. Astralium pyramidale, Webster, T.N.Z.I., xxxvii, 276, 

 pi. 9, f. 2. (The last four names refer to young shells of the subspecies.) 



Distinguished from the species by the high conical form and by 

 the whorls being keeled at the periphery. 



Diameter, 3-25 in. ; height, 4-5 in. (type specimen). 



Type in the Dominion Museum, Wellington. 



Hob. The type specimen, much worn, was discovered at low 

 water at the cliffs at Nelson by the late Mr. E. H. Davis, of the New 

 Zealand Geological Survey ; Cook Strait ; Hauraki Gulf ; Banks 

 Peninsula (Iredale). 



Fam. PHASIANELLID^, Troschel. 



Animal with long tentacles, and usually pectinated head -lobes ; 

 epipodial line usually with cirri ; branchial plume long ; foot 

 narrow, long, pointed posteriorly, rounded before, below divided 

 longitudinally by a median groove. Jaws rhomboidal, covered with 

 imbricating scales. Radula rather short ; formula of teeth typically 

 oo+5 + l+5 + oo, but sometimes lacking the median and outer 

 lateral teeth. 



Genus 1. PHASIANELLA, Lamarck, 1804. 



Pliasiant'Uci, Lam., Ann. du Musee, iv, 295. Type : P. australis, Gnielin. 

 Shell imperforate, not nacreous, oval or oblong, polished ; aper- 

 ture entire, oval, higher than broad, ungulate in front ; columella 

 smooth, compressed, attenuated at the base ; outer margin simple, 

 sharp. 



