162 Transactions.—Zoology. 
Arr. XXI.—Notes on some Branchiate Mollusca. 
By Professor F. W. Hutton. 
[Read before the Philosophical Institute of Canterbury, 7th July, 1881.) , 
Plates VI and VII. 
Octopus Maorum. Dentition. The central tooth varies much in shape; 
usually it has only a median cusp, which carries a long cutting point at its 
end, and asmall one on each side, but sometimes there is a small cusp behind 
each smaller eutting point. The first lateral is rudimentary, with a small 
curved cusp. The second lateral is short and broad, its breadth being four 
or five times its length, and is more or less curved; it has a short triangu- 
lar cutting point at each end, the outer one of which is hidden by the base 
of the third lateral. The third lateral has a quadrate base, and a long 
curved cutting point, blunt at the end. The marginal plate is large, its 
breadth more than twice its length; it tapers outwards; the anterior margin 
is slightly concave, the posterior is convex. (Pl. VL., fig. a.) 
The drawing is taken from a very small specimen obtained at Welling: 
ton. : 
OmmasTRepaEs stoantt. Dentition. The central tooth is tricuspid, the 
median cusp rounded, the side cusps sharply pointed ; the median cusp 
carries a long narrow cutting point. The first lateral is bicuspid ; the outer 
cusp is sharp and without a cutting point, the inner cusp is rounded, and 
with a narrow sharp cutting point slanting slightly inward. The second 
lateral has a quadrate base, and a single cusp bearing a long sharp curved 
cutting point. The third lateral is like the second, but has an aculeate 
base. The marginal plate is small and oval. (Pl. VI., fig. 8.) 
The drawing is from a very small specimen obtained at Dunedin. 
Eurnera tineata. Dentition. The central tooth is nearly twice as 
as long, with three sharp denticles on the upper anterior surface. 
laterals have a long curved denticle on the outside and two small ones clo 
together on the inside. They lie close to the central tooth. (PI. VL, fig: >») 
The nucleus of the operculum is apical, forming the apex. The drawing 
was made from a specimen an inch in length, intermediate between varieties 
A. and ©. It was obtained at Sumner. 
CommnELLA FUNEREA. Animal yellowish white. The eyes are half 
way up the tentacles, which are marked with black in the region of the eyes: 
Top and sides of the head with dead-white spots. Siphon long and recurved, 
white speckled with black. Foot slightly expanded and inate 
front, rounded behind ; with two black spots in front. .4 
Operculum with the nucleus apical, within the apex, the margins simple. 4 
broad 
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