Janthhut.] GASTROPODA. 299 



broadly angled above, effuse at the base o-f the columella. Outer lip 

 sharply rounded, slightly sinuate. Basal lip slightly convex, de- 

 scending. Columella vertical, twisted, expanded below, and forming 

 with the basal lip a triangular rounded point. 



Diameter, 19 mm. ; height, 16 mm. 



Animal unknown. 



Type in the British Museum. 



Hab. North Island, more common on the west coast ; Kermadec 

 Islands (Captain Bollons). 



The type is from the Cape of Good Hope. 



2. Janthina communis, Lamarck, 1839. Plate 44, fig. 11. 



Janthina communis, Lara., A.s.V., ed. Desh. & Edwards, iii, 504 ; Conch. 

 Icon., xi, pi. 1, f. 5 ; Thes. Conch., v, 50, pi. 443, f. 7 ; M.N.Z.M., 71 ; 

 Man. Conch. (1), ix, 36, pi. 9, f. 99. J. ianthina, L. : Hutton, C.M.M., 6 ; 

 not of Linnaeus. L. f myth's, Lam., Index, 80 ; not of Lamarck. 



Shell rather large, turbinate, thin. Sculpture consisting of fine 

 oblique growth-lines and low folds, sinuated over the angle of the 

 whorls ; crossed by very inequidistant spiral stria?, very distinct upon 

 the base. Colour purplish-white above, violet below the angle. Spire 

 conoidal, with a blunt apex, outlines convex. Protoconch minute, 

 pupiform, oblique to the vertical axis, of 3 faintly spirally striated 

 whorls. Whorls 7, flatly convex, sometimes slightly depressed below 

 the suture, periphery bluntly angled ; base flatly convex. Suture 

 impressed. Aperture subtetragonal, large, slightly angular above, 

 effuse below the columella. Outer lip angularly convex, thin and 

 sharp, slightly sinuous. Basal Up almost straight, descending. Colu- 

 mella vertical, thin, strongly twisted, flattened below, and produced 

 with the basal lip into a point. Parietal wall slightly convex, with a 

 very thin glaze spread over it. 



Diameter, 21 mm. ; height, 17 mm. Diameter, 28 mm. ; height, 

 27 mm. (adult specimen). 



Dentition. Hutton,. T.N.Z.I., xiv, 164, pi. 7, f. F. 



Type in the Mus. Hist. Nat., Geneva. 



Hab. North Island, found washed up after gales. 



3. Janthina exigua, Lamarck, 1822. Plate 44, fig. 12. 



Janthina exiyua, Lam., A.s.V., vi, 1822, 206 ; Conch. Icon., xi, pi. 5, f. 21 ; 

 Thes. Conch., v, 51, pi. 444, f. 23, 24 ; Chenu, Man. Conch., i, 118, f. 519 ; 

 Man. Conch. (1), ix, 37, pi. 10, f. 17. 



Shell rather small, thin and fragile, radiately striated, with a deep 

 sinus. Sculpture consisting of oblique, unequal, radiate, and flexuous 

 striae, with a deep angular sinus, forming a peripheral groove ; a few 

 faint spiral stria? upon the base. Colour light violaceous, darker in 

 the smaller specimens, with a white band below the suture. Spire 

 short, conoidal, not quite half the height of the aperture. Protoconch 



