300 GASTROPODA. [Pectinibranchia. 



minute, pupiform, slightly oblique, of 3 convex and smooth whorls. 

 Whorls about 7, slowly then rapidly increasing, convex ; base convex. 

 Suture impressed. Aperture large, semioval, produced below. Outer 

 lip convex, thin and sharp, with a deep, sharply angular sinus in the 

 middle. Basal lip produced. Columella vertical, straight and high, 

 not twisted, slightly expanded, leaving sometimes a narrow umbilical 

 chink. Parietal wall with a very thin callous layer. 



Diameter, 10-15 mm. ; height, 10-15 mm. 



Animal unknown. 



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



Hal). North and South Islands, but more common in the North ; 

 Chatham Islands ; coast of Taranaki (Diefienbach) ; Auckland Har- 

 bour (Cheeseman) ; Mokohinau Islands ; Ahipara Beach ; Banks 

 Peninsula (Iredale). 



4. Janthina globosa, Swainson, 1822. Plate 44, fig. 13. 



Janthina globosa, Swains., Zool. Illustr., ii, 1822, pi. 85 ; Conch. Icon., xi, 

 pi. 4, f. 18; Man. Conch. (1), ix, 37, pi. 10, f. 12. J. nitens, Menke, 

 Synopsis, 1828, 84 ; Man. Conch., I.e., f. 11. /. tricolor, Reeve, Conch. 

 Icon., xi, 1858, f. 23 ; M.N.Z.M., 71 ; Man. Conch., I.e., L 14. 



Shell globose, very thin and fragile, plicately striated, polished. 

 Sculpture consisting of oblique growth-stride and plications, sharply 

 sinuated below the middle of the last whorl, where there appear a 

 few fine spiral lines ; base with a few distant spiral incisions. Colour 

 light violaceous, whitish below the suture, but darker on the base. 

 Spire short, slightly immersed ; outlines convex. Protoconch minute, 

 pupiform. Whorls about 7, first slowly then rapidly increasing, con- 

 vex, indistinctly biangulate ; base convex. Suture deep. Aperture 

 large, oval, higher than broad, produced into a short open channel 

 at the base, rounded above. Outer lip regularly convex, with an 

 angular not very deep sinus. Columella vertical, very little twisted, 

 terminating in a point below. Inner lip very little expanded beyond 

 the columella, forming a thin callus on the parietal wall.- 



Diameter, 38 mm. ; height, 41 mm. (large specimen). 



Animal unknown. 



Hob. North Island, not common. 



Fam. CYPR^ID^E, Fleming. 



Animal having a short proboscis, the tentacles usually long and 

 stout, the eyes situate on a thickened portion about one-third the 

 distance from the base ; pallial aperture provided with a short anterior 

 siphon ; mantle produced into two lobes capable of covering the shell, 

 and furnished with warts, or forked or pointed filaments, sometimes 

 papillose, as in Trivia. Anus posterior ; foot broad ; osphradium 

 with three lobes. The animals are hermaphrodite, with a very large 

 copulatory organ. Radula rather long, with 7 series of teeth, arranged 



