24 SIR CHARLES ELIOT. 
has on each side of it a short, thick, blunt tentacle. The rhinophores are much larger 
than these tentacles (4°7 mm. high), wrinkled but not perfoliate. The back is 
strongly arched, and shows a clear central space, 3-4 mm. wide, without any cerata. 
The head and the foot are of about the same breadth, 4°5 mm. 
The jaws are brown and hard, enclosing the buccal mass. The masticatory process 
bears a single row of very irregular projections of varying shapes, with little lumps 
behind them, but there cannot be said to be any regular denticles. The radula 
consists of a single row of twenty-six brown teeth (figs. 25 and 26). They are of the 
horse-shoe shape with a fairly strong central cusp, and six, or rarely seven, lateral denti- 
cles. The outermost denticle is curved strongly inwards. The others are fairly straight. 
9. CUTHONELLA PARADOXA. 
One specimen from Winter Quarters, captured February 20th, 1902. It is yellow 
with traces of reddish brown and some minute reddish dots on the larger cerata. The 
intestines and hepatic diverticula, as seen through the integuments, are reddish brown. 
a 3 
Fie. 27.—Cuthonella paradowa—A Toots; a From aBove; b From BELOW. 
Length, 11 mm., breadth, 8 mm., height, 4:3 mm. The pointed tail, as distinct from 
the dorsum, is 2°3 mm. long. 
The oral tentacles are 2 mm. long, and point straight right and left. The rhino- 
phores are 3 mm. long, stout, bent forwards and bear transverse rings, but it is not clear 
if these rings are natural or the result of contractions. 
On the left side is a single line of twelve cerata along the dorsal margin, none 
more than 1 mm. high, conical, with gaps between them, so that the line is probably 
not complete. Within this line there remains still attached a single very large papilla 
about 7 mm. long and rather bent. It is behind and slightly to the left of the anal 
papilla. On the right-hand side is a similar line of twelve cerata, mostly rather larger. 
Under the first three of them is a second row of three very small ones. In the bottle 
are seven detached cerata measuring 7, 5, 5, 4,4, 3,2 mm. respectively. The anal 
papilla is dorsal, set far back (7 mm. from anterior end) and slightly to the right of the 
median line. The genital orifices are 4 mm. from the anterior end, rather high up on 
the side. 
The anterior end of the body forms a hotd over the mouth which, as preserved, is 
ventral. The foot is rounded in front, thickened at the margin and slightly expanded, 
