458 GASTROPODA. ['Pectinibranchia. 



convex, the last produced and narrowed anteriorly ; with a slight but 

 distinct swelling which proceeds as a pad from opposite the posterior 

 columellar plait and sweeps out and forwards. Suture distinct, 

 lightly impressed. Aperture elongate, narrow, subchamielled above, 

 broadly rounded at the base. Outer lip very slightly reflected and 

 thickened, smooth inside, a little retrocurrent at its insertion. Inner 

 lip forming a narrow callus upon the oblique, almost straight body. 

 Columella subvertical, with 4 evenly spaced rather thin plaits, the 

 superior short and almost transverse, the next sloping, but less oblique 

 than the succeeding two, the lower of which is a little twisted and 

 margins the very short open canal. 



Diameter, 3-1 mm. ; height. 6-9 mm. (type). 



Animal unknown. 



Type in the Dominion Museum, Wellington. 



Hab. Off Great Barrier Island, in 110 fathoms (type). 



Remark. --It is larger than the allied M. Allporti, and has no 

 tubercles on the outer lip. but the indication of brown spiral bands 

 connects it with that species. 



2. Marginalia Stewartiana, Suter, 1908. Plate 20, fig. 10. 

 Marginella Stewartiana, Suter, P. Mai. S., viii, 1908, 183, pi. 7, f. 12. 



Shell small, elongately oval, smooth and polished, white, with an 

 elevated spire. There is no sculpture. Colour white. Spire elevated, 

 conic, with a pointed apex, its height less than half that of the aper- 

 ture. Protoconch small, smooth, rounded. Whorls 3, the last high, 

 moderately convex, narrowed towards the base, spire-whorls flatly 

 rounded. Suture lightly impressed, narrowly margined below. Aper- 

 ture oblique, high and narrow, lightly channelled above, truncated and 

 not notched below. Outer lip oblique, straight and thickened at the 

 middle, lightly retrocurrent and with a narrow sinus above, smooth 

 inside. Columella faintly concave, with 4 subequidistant slender and 

 oblique plaits, the lower two more prominent, the last extending to 

 the basal margin. Inner lip thin and transparent. 



Diameter, 2-3 mm. ; height, 4-6 mm. 



Animal unknown. 



Type in my collection. 



Hab. Port Pegasus, Stewart Island, in 18 fathoms (Captain 

 Bollons). 



Remark. This species is very closely allied to M. hebescens, M. & S., 

 but it is more elongate, the spire more acuminate and with a much 

 sharper apex, and the suture is less impressed. 



Sect. 2. ERATOIDEA, Weinkauff, 1878. 



Eratoidea, Weinkauff, Kiister's Conch. Cab., 1878, 120, 140. Type : Marginella 

 margariia, Kiener. Denticitloglabella, Sacco, 1889. 



Shell ventricose, not much elongated ; spire short ; whorls convex ; 

 suture impressed, the last whorl oval, rounded and sometimes plicated 



