MuEDOCH. — On Neiu Species of Pliocene Molliisca. 219 



versely ribbed, ribs slightly oblique, seventeen to nineteen on 

 the body-whorl, becoming obsolete as they approach the an- 

 terior end, fine growth-lines on and between the ribs ; the 

 anterior end of body-whorl with ten or a dozen minute spiral 

 striae, and three or four on the sinus area ; sutures impressed ; 

 aperture ovate-elongated, somewhat narrow and oblique ; 

 columella straight, anterior canal short, lightly curved, outer 

 lip thin, sinus shallow. Length, 10 mm. ; breadth, 4 mm. 



Differs from G. abnormis, Hutton, in the greater number 

 of longitudinal ribs and the whorls not angled ; from other 

 New Zealand fossil species in the spiral sculpture being 

 limited to the anterior end of body-whorl and the few deli- 

 cate lines on and above the sinus area.''' 



Clathurella corrugata, n. sp. Plate XX., fig. 8. 



Shell small, fusiform ; the body much longer than the 

 spire ; whorls 5f , protoconch one and a half whorls, polished 

 and with spiral lines, the others with strong longitudinal ribs, 

 ten or eleven on a whorl ; these are crossed by fine spiral 

 ribs, of which there are six or seven on the spire-whorls, the 

 three anterior strongest, with one or two threads in the in- 

 terspaces ; on the body-whorl are about thirteen principal 

 spirals, with here and thei'e a delicate thread or two in the 

 interspaces ; at the posterior end are five or six minute irre- 

 gular threads ; the first three ribs above the aperture are the 

 strongest ; sutures well marked ; aperture somewhat narrow, 

 columella straight, anterior canal short and straight, outer 

 lip thin, slightly angled above, sinus well marked. Length, 

 7 mm. ; breadth, 3 mm. 



Type, Wanganui Museum. 



Locality. — Blue-clay cliiifs, west of Wanganui Heads. 



The example described and figured is, perhaps, not quite 

 adult; other specimens have a length of 9-5 mm.'; unfortu- 

 nately, they are more or less broken, the sculpture rubbed 

 and somewhat indistinct. From C. abnormis, Hutton, it may 

 at once be distinguished by the spiral sculpture on posterior 

 end of body-whoL'l ; from G. dictyota, Hutton, in the longi- 

 tudinal ribs being much stronger and the cancellated sculp- 

 ture less marked. I have not seen the latter species. 



Clathurella hamiltoni, Hutton. 

 Hutton, Trans. N.Z. Inst., vol. xvii., p. 316, pi. xviii., fig. 7; 



Macleay Memorial Volume, p. 52, pi. vii., fig. 35. 



The examples of this species occurring in the Wanganui 

 and Okehu formations differ from the typical forms m their 

 smaller size — they vary in length from 6-5 mm. to 9 mm. ; 



* For further reference to this species, see Suter, "Revision of the 

 New Zealand PleurotomidcB," Trans. N.Z. Inst., vol. xxxi., pp. 73, 74. 



