268 GASTROPODA. [Pectinibranchia. 



distinct ; on the last whorl each of the fuirows between the cords is 

 provided with a fine thread, and the carina bounding the base bears 

 the suprasutural cord ; base with 6 fine cinguli. Colour dirty-white. 

 Spire high, narrowly conical ; outlines lightly convex. Protoconch 

 globose, smooth and polished. Whorls 8, regularly increasing, convex ; 

 base nearly flat. Suture impressed. Aperture vertical, oval, higher 

 than broad. Outer lip sharp, -with a broadly rounded not very deep 

 sinus. Basal lip effuse. Columella vertical, almost straight. Inner 

 lip slightly reflexed, spreading over the parietal wall as a thin white 

 and shining callus. Operculum unknown. 



Diameter, 3-7 mm. ; height, 10-8 mm. (shell of 8 whorls). 



Animal unknown. 



Type in my collection. 



Hob. Dredged off Otago Heads (A. Hamilton). 



Remarks. The only specimen I possess has the outer lip damaged. 

 The shell is, no doubt, not quite full grown. There is a very nearly 

 allied form, still undescribed, from the Pliocene of Waikopiri, in my 

 collection. 



3. Turritella difficilis, Suter, 1908. Plate 15, fig. 11. 

 Turritdla difficilis, Suter, P. Mai. S., viii, 40 ; pi. 3, f. 52. 



Shell small, elevated conical, rather thin, lower whorls with 3 cinguli, 

 the lowest suprasutural. Sculpture : The first two whorls smooth, the 

 third with a spiral at the periphery and one below it, the next four 

 whorls with 4 spirals, interspaces subequal, the lowest spiral close to 

 the suture ; on the remaining whorls the second, median, spiral is 

 becoming much finer, and at the same time another fine spiral thread 

 appears ; very soon they increase to the number of 6 to 8. filling the 

 interspace between the original first and third prominent spiral ; a 

 few spiral threads develop between the suture and the first spiral, 

 and 4 to 5 between the suprasutural and the spiral above ; the supra- 

 sutural spiral forms a sharp keel bounding the base, which is finely 

 spirally striated ; growth-lines indistinct, sinuate. Colour yellowish- 

 white. Spire high, conical, with straight outlines. Protoconch of 2 

 smooth strongly convex whorls. The number of tchorls may be 15 

 or more ; the third and fourth gradate, the following two or three 

 convex, and the rest flat, the interspaces between the spirals concave ; 

 base excavated. Suture impressed. Aperture subquadrate. Outer lip 

 sharp, with a moderately deep median rounded sinus. Columella 

 vertical, arcuate. 



Diameter, 6 mm. ; height, 16 mm. (immature specimen of 10 whorls 

 only). Angle of spire, 20. 



Animal unknown. 



Type in my collection. 



Hab. Near the Snares, in 50 fathoms (Captain Bollons). No 

 oerfect specimens. 



