SuTEK. — On Neiu Zealand Mollusca. 295 



The jaw and radula are very much the same as in the 

 species. Dentition, 12—4—1—4—12. The teeth of the first 

 marginals are less oblique. 



Diameter, greatest 2|mm., least 2i-mm. ; height, Ifmm. 



Hab. Boatman's, near Eeefton, from whence it was sent 

 to me by Mr. A. T. Cavell. 



At first sight this shell seems to be an intermediate form 

 betwen P. sterkiana and P. hrouni, but a close examination 

 shows it to be much more allied to the first, though the ribs 

 are much coarser and more distant. The radula fully justifies 

 its estimation as a variety only of P. sterkiana. 



.Patula sterkiana, Sut., forma major. 



This shell corresponds in every respect with the species 

 from Hooker Yalley, but is somewhat larger, no doubt owing 

 to the difference in the habitat. 



Diameter, greatest 4imm., least 4mm. ; height, 2imm. 



Hah. Owaka (Clutha), where it was found by Mr. J. T. 

 Bryant. 



As was to be anticipated, the new species I found in the 

 Hooker Valley are very likely distributed over many other 

 parts of this Island, and this has been confirmed now, at least, 

 for one of them. 



Patula biconcava, Pf. From Forty-mile Bush, North Island. 



Plate XXIL, figs. 30, 31. 



Jaiv slightly arcuated, membranaceous, not tapering, with 

 one transverse and several vertical fine strise. 



Badula tongue-shaped, consisting of about 120 almost 

 straight transverse rows of teeth, 14 — 5 — 1 — 5 — 14. 



Central tooth nearly quadrate, large, with a tricuspid re- 

 flection, of which the median cusp reaches to the end of the 

 base, the short cutting-point beyond it. Side-cusps oval, with 

 one minute cutting-point on each. 



La ^cra/s very much the same as the central; in the first 

 two the median cutting-point is a little longer. 



First marginals with an irregular head, getting broad and 

 short in the external teeth, tridentate, the median tooth 

 strongest developed, most of the teeth slightly curved. 



The presence of a jaw, as well as the form of the teeth, show- 

 clearly that Pieiffer and I were greatly mistaken in placing 

 this mollusc, according to the form of the shell, in the genus 

 Dij^lojujjhahis. 



Patula subantialba, Sut. (= Diploinphahcs siibantialba, S.). 



From Forty-mile Bush, North Island. Plate XXIL, figs. 



32, 33. 



Jaw strongly arcuate, membranaceous, ends rounded, both 

 margins smooth, faintly and distantly vertically striated. 



