Mangilia.] GASTROPODA. 499 



Hob. Whangaroa Harbour, type (C. Traill) ; Foveaux Strait, in 

 15 fathoms (A. Hamilton) ; near the Snares, in 50 fathoms (Captain 

 Bollons). 



Subsp. whangaroaensis, Murdoch, 1905. 



Clathurella epentroma whangaroaensis, Murd., T.N.Z.I., xxxvii, 1904 (1905), 

 219, pi. 7, f. 5. Mangilia (Clathurella) epentroma whangaroaensis, Murd. : 

 Suter, J. Mai., xii, 73. 



Differs from the species in the whorls being strongly angled, spire 

 somewhat turreted, and the principal spiral riblets much more pro- 

 nounced, but similarly placed. Colour, number of whorls, and proto- 

 conch the same as in the species. Axial ribs 14 on the last whorl, 

 equal to or narrower than the interspaces. Spirals on the spire- 

 whorls 2, and on the last 4 or 5, prominent and forming beads on 

 crossing the axials. In addition there are on the anterior end a few 

 more crowded and rather smaller ; the interspaces with spiral striae, 

 4 or more usually minute, sometimes almost microscopic. Spire 

 1 times the height of the aperture. Outer lip with usually 5 well- 

 marked sinuations corresponding to the principal spirals ; posterior 

 sinus shallow. 



Diameter, 2-5 mm. ; height, 6-8 mm. 



Animal unknown. 



Type in the Dominion Museum, Wellington. 



Hob. Whangaroa Harbour, type (C. Traill). 



Remark. This form seems to somewhat approach Mangilia con- 

 nectans, Sow., from South Australia. 



5. Mangilia flexicostata, Suter, 1899. Plate 21, fig. 24. 



Mangilia flexicostata, Suter, T.N.Z.I., xxxi, 1898 (1899), 73, pi. 3, f. 3. 



Shell minute, elongated oval, gradate, flexuously costate, semi- 

 transparent, thin and fragile. Sculpture consisting of axial narrow 

 and flexuous riblets, about 18 on the last whorl, antecurrent upon the 

 shoulder, obsolete towards the base, the interstices of about the same 

 width as the riblets, and microscopically spirally striate. Colour 

 whitish, vitreous. Spire conic, gradate, of about the same height 

 as the aperture. Protoconch papillate, of 1| whorls, microscopically 

 spirally striate, but very often worn smooth. Whorls 5, rather rapidly 

 increasing, with a narrow, but little-sloping shoulder, almost flat 

 below it ; base contracted. Suture deep. Aperture narrowly oval, 

 angled above, with a short oblique broad and slightly recurved 

 canal, truncated at its base. Outer lip somewhat thickened, angled 

 above, moderately convex or almost straight at the middle, somewhat 

 contracted below, with a broad shallow sinus just below the suture. 

 Columella arcuate, turned to the left below. Inner lip thin and 

 narrow. 



Diameter, 1-25 mm. ; height, 2-25 mm. 



