SuTER. — On Ncto Zealand Mollusca. 287 



both margins. Considerable magnifying shows the plaits to 

 be imbricate, straight or slightly curved, and vertical. Cutting- 

 margin concave, without median projection. 



liadula tongue-shaped, consisting of about 110 almost 

 straight transverse rows of teeth, 17 — 13 — 1 — 13 — 17. 



Base of central tooth nearly rectangular, somewhat 

 broader at the posterior margin, longer than broad. Ee- 

 flection tricuspid, median cusp almost as broad as the base, 

 with a blunt, short, broad cutting-point, not reaching to the 

 posterior end of the base. Side-cusps very small and short, 

 each with a rudimentary cutting-point. 



Laterals asymmetrical, with a rectangular oblique base, 

 broadest near the central, and narrower towards the mar- 

 ginals. Eeflection tricuspid on the first ten teeth, when the 

 inner cusp obliterates. Median cusp well developed, with a 

 cutting-point which does not reach to the posterior end of 

 the base ; broad on the first teeth, narrower and longer on 

 approaching the marginals. Inner side-cusp and cutting-point 

 of the first ten teeth very small. Outer side-cusp first more 

 developed than in the central tooth, but obliterating by 

 degrees. Cutting-point always short. 



The first marginals are unidentate, with a long narrow 

 rectangular base, beyond which the thorn-shaped cutting- 

 point reaches. All the other marginals are aculeate, stout. 

 They diminish in size considerably towards the margin. 



The radula of this species does not differ very much from 

 that of Fli. hehnsi, Hutt., as described and figured bv Pro- 

 fessor F. W. Hutton (Trans. N.Z. Inst., vol. xvi., p. 172), but 

 the jaw may be used for distinguishing the species. In Ph. 

 helvisi it consists of about 20-25 flat ribs, whilst in Ph. 

 hypoijolia there are just about double that number. 



Amphidoxa corneo-fulva, Pf. From Nerger Eange, South 

 Island. Plate XX., figs. 5, a, b, 6, 7. 



Jaio membranaceous, slightly arcuate, narrower in the 

 middle, ends swollen, blunt; numerous vertical plaits strongly 

 indentate the cutting -margin, but leave the upper margin 

 smooth. 



Badula long, tongue-shaped, consisting of about 140 

 straight transverse rows of teeth, 17 — 16—1 — 16 — 17. 



Central tooth rectangular, much longer than broad, 

 slightly contracted in the middle ; reflection large, reach- 

 ing to the middle of the base, unicuspid, with a large cutting- 

 point, not attaming the posterior end of the base. 



Laterals.— The first ten are very similar to the central, 

 but the reflection is somewhat larger, and the cutting-point 

 stouter and longer, extending a little over the following row 

 of teeth. The following teeth are getting shorter, rhomboidal. 



