172 Transactions.—Zoology. 
Dentition, 18-1-18.  Laterals 7. 
Central tooth rectangular, as broad as long; the reflexed portion 
tricuspid, the middle cusp reaching a half and the side-cusps a third of 
the length of the base. Inner laterals rather longer than broad, tricuspid, 
the reflexed portion constricted at the sides, the middle cusp reaching 
almost to the posterior margin, and with a small point: outer laterals 
with the inner side of the reflexed portion hollowed out; the outer side 
with a small constricted cusp, middle cusp with a large point. Inner 
marginals tridentate, the inner and middle points larger; outer marginals 
much broader than long, with a single dentate point, which gets smaller 
outwards and disappears altogether on the two last. 
Hab. Greymouth (R. Helms). 
PARYPHANTA JEFFREYSIANA, Pfeiffer. Pl. xi., fig. F. 
Jaw, none. Dentition, 9-0-9. 
Transverse rows of teeth forming an obtuse angle. Teeth robust, all 
acyleate, smooth, the points rounded ; increasing in size from the first to 
the fifth and then decreasing. The first about equal to the ninth; the 
third equal to the eighth. 
Hab, Auckland (T. F. Cheeseman), 
PArYPHANTA CORESIA, Gray. Pl. xi., fig. £. 
Jaw, none. Dentition, 9-0-9. 
Transverse rows of teeth forming an obtuse angle. Teeth rather robust, 
all aculeate, smooth, the points rounded ; increasing in size from the first 
to the fourth and then decreasing. The third as large as the fifth. 
Hab. Auckland (Cheeseman). 
The teeth are more slender than in jeffreysiana. 
Nanna marte, Gray. Pl. ix., fig. n. 
Jaw arcuate, not tapering, papillate, with about 33 flat ribs. 
Dentition, 47-1-47, without distinction between laterals and marginals. 
Central tooth rectangular, the length three and a half times the breadth ; 
the reflexed portion less than half the base, constricted at the sides and with 
a moderate point. Laterals larger than the central tooth; the reflexed 
portion minute, not more than a quarter of the base, bicuspid, the inner 
cusp with a long, the outer with a small point. Towards the margin the 
teeth get smaller and the points nearly equal. The two outer are minute 
and without points. 
Hab. Auckland (T. F. Cheeseman), 
Puacussa HELMSI, Hutton. PI. x., fig. 1, and pl. xi., fig. w. 
Jaw arcuate, not tapering, with 20 or 25 flat ribs which indent the con- 
cave margin. 
Dentition, 28-1-28 ; varying from 26 to 30. Laterals 11 or 12. 
