Turrix.] GASTROPODA. 473 



on the slope above the angle ; beneath the latter there are 4 much 

 stronger riblets, forming gemmules at the intersection of the axials ; 

 the last whorl with about 23 spirals, those upon the base and neck 

 more widely spaced but equally slender as those on the shoulder. 

 Colour light cream. Spire turriculate-conical, with a blunt apex. 

 Protoconch slightly bulbose. with about 2 smooth whorls, the nucleus 

 globular. Whorls 5. angled at the periphery, straight above, slightly 

 convex below ; base convex, then contracted, and ending in a short, 

 distally rounded beak. Suture deep. Aperture pyriform, broadly 

 angled above, ending in a rather short almost straight canal, slightly 

 turned to the left. Outer Up convex above, contracted near the base ; 

 the sinus broad, rounded, and moderately deep, extending almost 

 from the suture to the keel. ColameUa almost straight, slightly twisted 

 at the base. Inner lip forming a thin and narrow callosity. 



Diameter, 2-4 mm. ; height, 5-8 mm. 



Animal unknown. 



Type in the Dominion Museum. Wellington. 



Hob. Off Great Barrier Island, in 110 fathoms. 



Remark. In sculpture this species is allied to T. ischna, but the 

 spiral riblets are much more numerous. 



Genus 2. DRILLIA, Gray, 1838. 



Drillia, Gray, A.M.N.H., 1838, 28. Type : Pleurotoma umbilicata, Gray. 

 Moniliopsis, Conrad, 1865. 



Animal with tentacles approaching at their bases and eyes near 

 their extremities. 



Shell having a short canal ; outer lip subvaricose, the sinus between 

 the suture and the angle of the body- whorl. 



Inhabiting warm seas. 



Fossil in the Cretaceous and Tertiary. 



KEY TO SUBGENERA. 



A. Spire turriculate, canal recurved . . . . . . DRILLIA, s. str. 



B. Canal truncated. 



a. Axial costse discontinuous over the whorls . . . . CRASSISPIEA. 



b. Axial costae continuous over the whorls . . . . CYMATOSYRINX. 



Subgen. 1. DRILLIA, s. str. 



Shell narrowly fusiform ; spire high and turriculate ; protoconch 

 smooth, poly-gyrate, conoid, with the nucleus obtuse ; whorls convex 

 below, where they are ornamented with riblets or oblique nodules, 

 with a spiral depression above, followed by a more or less conspicuous 

 spiral ridge close to the suture ; spire higher than the aperture ; last 

 whorl rounded, with an obsolete basal fasciole ; aperture pyriform, 

 channelled above, not much contracted below, with a short wide 

 canal, oblique and slightly turned to the left ; outer lip moderately 



