162 Transactions. —Zoology. 
PATULA CELINDE, Gray. PI. ix., fig. o, and pl. xi., fig. v. 
Jaw slightly arcuate, with flat ribs; very delicate. 
Dentition, 18-1-18. Laterals aa 5. 
Central tooth rectangular, as broad as long; the reflexed portion tri- 
cuspid, extending over half the base, with a large, clavate, median cusp 
extending quite to the posterior margin, and with a rather large cutting 
point. Laterals like the central tooth. Inner marginals with an oblique 
reflexed portion carrying a long point at the end, the outer side indented 
and with a minute point. Outer marginals broader than long, with two 
points ; at first the inner point is much the larger, but near the outer edge 
both points get equal. 
Hab. Auckland (T. F. Cheeseman). 
The shell has distant membranaceous plaits which are produced at the 
periphery into triangular processes. 
ParuLa coma, Gray. PI. ix., fig. o, and pl. xi., fig. x. 
Animal small, mantle rather posterior, the tail not produced behind the 
shell ; eye-peduncles large, clavate, approximated at their bases; the 
tentacles short. Yellowish-white, eye-peduncles and a stripe down each side 
of the head dark purple. 
Jaw finely striated, arcuated, not tapering, with a slight median 
projection. 
Dentition, 18-1-13 ; varying from 12 to 15.  Laterals 4 or 5. 
Central tooth with the base broader than, or as broad as, long; the 
reflexed portion slightly contracted near the attachment, and tricuspid ; the 
median cusp with a long point reaching beyond the posterior margin of the 
base. Lateral teeth similar to the central, but with a longer base, and a 
shorter reflexed portion. Marginals with a tridentate cutting point, which — 
is bidentate on the penultimate and absent on the minute outer tooth. 
Hab. Ihave examined the radulas of seven individuals—five sent by 
Mr. Cheeseman from Auckland, and two by Mr. Helms from Greymouth. 
The living animal was sent by Mr. Helms. 
In the shell the interstices between the ribs are finely striated with 
growth-lines. i 
Parura tucetta, Hutton (=coma, Pfeiffer, not of Gray). Pl. xi., fig. a. 
Animal like P. coma, but white ; the peduncles purplish, and a band on 
each side of the head slightly speckled with purple. 
Jaw smooth, membranous, slightly tapering to-each end. 
Dentition, 14-1-14. Laterals 6 
Central tooth rectangular, as long as broad; the reflexed portion less 
than half the base, tricuspid ; the middle cusp with its point reaching to 
the posterior margin. Laterals about 6, the inner with the side-cusps 
