155 
Dr. Bergh brackets this species with C. (•aledonicwm , 
Fischer, C. teuuf, Abraham, and ('. ohlonf/ii rn , Abraham, It 
seems to us that Fischer's description indicates a species in 
which the lobes of the nothaeum are more developed : the 
colour scheme of the New Caledonian species is quite unlike 
that of the Australian. The difference between G. hrevicajida- 
tiim and C. ohlomjuiu seems to us merely a matter |of preser- 
vation. Out of a parcel resulting from the same dredging we 
have seen individuals, some of which shrunk to the shape of 
ohlo)i(/in7i and others assumed in contraction the form of hre- 
vicaiidatuin . The following description was drawn up from 
living specimens : — 
Body large, elongate, dorsally flat, rounded in front, 
sides nearly parallel, except along a slight lateral enlarge- 
ment in the centre, and tapering to an obtuse point behind ; 
sides much elevated, especially in the region of the vent. 
Cloak obsolete, sub-quadrangular, with an undulate 
margin, and ending posteriorly in a peculiar nipple- 
like protuberance. Colour, beautifully shaded with tints of 
buff to light brown, usually of a deeper colour at the border, 
and gradually fading inwards, leaving along the margin of 
the dorsal surface a series of alternate light and dark patches, 
there being in the centre of the former in each case a round, 
violet-purple spot surrounded by a uniform ring of reddish- 
purple. The central area of this surface is richly sprinkled 
with circular spots of varying size, of a light violet-purple 
colour, with a darker border, and delicately surrounded in 
some cases by a rim of light lemon-yellow ; the larger spots of 
this series are also rendered conspicuous by being situated 
within the more faintly tinted patches of the cloak. The 
''post-branchial flesh protuberance" is neatly decorated by a 
series of brown circles, placed contiguously S;0 as to produce a 
regular network with meshes of different dimensions. The 
. . . V 
sides are somewhat similarly marked to the cloak, being 
lightly tinted and richly sprinkled with three irregular, longi- 
tudinal rows of spots, the two outer rows of rich purple, the 
inner of a lighter violet-purple. The median row does not 
extend to beyond the length of the* cloak, and thus leaves the 
dorsal portion of the tail marked with deep purple spots only. 
The spots are in this portion irregularly scattered, and often 
appear as small groups of two or three ; they are more nume- 
rous and smaller in size than those upon the cloak. Foot; 
linear, tapering posteriorly to a blunt point : colour white. 
Dorsal tentacles clavate, obliquely laminated ; the number of 
lamellae varying from 16 to 30 or more; colour rich orange 
yellow. Sheaths very slightly elevated. Oral tentacles stout, 
sub-conical, tapering towards the points. Genital aperture 
