Marginella.] GASTROPODA. 461 



conoidal. Protoconch broadly rounded. Whorls 4, the last very high 

 and flatly convex. Suture indistinct. Aperture high and narrow, 

 subchannelled above, truncate below, but not notched. Outer lip 

 vertical, nearly straight, retrocurrent towards the suture, with an 

 obsolete outer varix, thickened at the middle, and smooth or minutely 

 crenate within. Columella subvertical, with 4 equidistant oblique 

 plaits, the lowest two slightly more oblique than the otheis. Inner 

 lip very thin, transparent, broadly expanded over the body. 



Diameter, 4-2 mm. ; height, 8-3 mm. (Tauranga specimen). 



Animal unknown. 



Type in the British Museum. 



Hob. Bay of Islands ; Whangarei Heads (C. Cooper) ; Moko- 

 hinau Group ; Great Barrier Island ; Tauranga (C. Spencer). The 

 type was dredged by Mr. Brazier off " Sow and Pigs," in Port Jackson. 



Remark. This species is very variable in size ; the colour may be 

 pure-white, and the outer lip smooth or crenate. Hedley suggests that 

 " the name Stanislas may be retained in a varietal sense for the large 

 white form which in warmer latitudes is restricted to deep water." 



Subgen. 3. GLABELLA, Swainson, 1840. 



Glabella, Swains., " Malacology," 1840, 324. Type : Mnrginelln prunum, 

 Gmel. Prunum, H. and A. Adams, 1853. Egoitena, Jouss., 1875. 

 Porcellana, Conr., 1862. 



Shell fairly large, ovoid, sometimes a little ventricose ; spire 

 short, conoidal, with pointed apex ; protoconch small, obtuse, and 

 indistinct ; whorls 3 to 5, impressed at the suture, the last nearly 

 the whole height of the shell, oval, regularly attenuated at the base, 

 which is not or only lightly sinuated ; aperture very narrow above, 

 channelled, the channel sometimes excavating the outer lip, slightly 

 widened below, terminating in a but-little-marked sinus ; outer lip 

 lightly oblique, somewhat convex, very thick, smooth and reflected 

 inside, with a marginal rounded varix, extending along the basal 

 sinuosity, almost always ascending upon the spire, sometimes to the 

 apex, with a depression opposite the upper channel ; columella ob- 

 lique, straight, with 4 rather strong plaits, the two lower ones closer 

 together ; inner lip often callous and spreading over the body, but 

 always limited below and joining the extension of the labial varix 



over the base. 



KEY TO SPECIES. 



A. Shell with axial sculpture, though not prominent. 



a. Body-whorl shouldered ; rounded axial riblets at the 



shoulder ; 5 mm. by 9 mm. . . . . . . turbinata. 



aa. Body-whorl convex. 



b. Shell oviform, with fine axial striae ; height of spire 

 about one-fifth that of the aperture ; 1-7 mm. by 

 3-1 mm. . . . . . . . . . . parvistriata. 



bb. Shell volutiforrn, with fine axial plications ; aperture 



nearly as high as the shell ; 1-7 mm. by 3 mm. . . plicatula. 



