Hurton.—On some Branchiate Mollusca. 163 
Dentition. The central tooth is curved, rather swollen at each end, its 
breadth four times its length ; it has three equal denticles in the middle on 
its anterior surface. The lateral teeth have two denticles, the outer being 
the longer, and more curved; they lie distant from the central tooth. 
(Pl. VI, fig. c.) , 
The specimen from which the drawing was made was obtained at 
Sumner. 
CotumBeLta cHoava, Animal yellowish white, with a narrow black 
longitudinal line on the back of the head, between the eyes ; some scattered 
dead-white spots on the body and siphon. ‘Tentacles thick, not tapered, 
approximated; the eyes at their outer bases. Siphon curved. Foot ex- 
panded in front, and notched at each side. No operculum, (Pl. VIL., fig. 0.) 
Dentition. 1-0-1; the central portion of the radula is thickened, and 
divided transversely into membraneous plates, which are broader than long, 
but the plates bear no teeth. The lateral teeth are versatile; they are 
curved, pointed at the end, and with two small denticles on the concave 
side. (Pl. VIL., fig. P.) 
This species occurs occasionally on seaweed in Lyttelton Harbour. I 
described the animal in the ‘‘ Transactions of the New Zealand Institute,” 
Vol. xiii., p. 201, by mistake, under the name of Defranchia luteo-fasciata. 
Strurmonarra papunosa, The dentition is remarkably like that of 
Trochita, The radula is delicate and short, with only about 24 transverse 
tows of teeth. The central tooth has a quadrate base; the reflected portion 
is triangular, rather longer than broad, and denticulated on each side. The 
first lateral has a breadth of nearly twice its length, and the short reflected 
Portion is slightly denticulated on the margin. The second and third 
laterals are nearly similar, but the base of the second is rather broader and 
Squarer than that of the third; they are versatile. Both are long and 
curved, the apex blunt and slightly bent over; both are denticulated at the 
end and on either side near the apex, the denticulations stronger on the 
cuter side, (Pl. VI, fig. H.) 
In the male the denticulations are stronger than in the female, in all 
other respects they are alike. The drawing is taken from a specimen col- 
lected at Nelson by Mr. J. D. Enys, in it the teeth are separated to show 
their form. In. their proper position the apices of the second and third 
laterals nearly meet in the centre. The breadth of the radula is -019 inch, 
and its length about -07 inch, in a full-sized specimen. 
Trocurra Nova-zeatanpix. Dentition. The radula has about 44 trans- 
verse rows of teeth; the second and third laterals are versatile. The 
Sentral tooth has a broad rounded base, the reflected has a median cusp 
with four small denticles on each side; the cusp has a sharp cutting point. 
