REPORT ON THE NUDIBR AN CHIATA 
81 
was reddish, the club yellowish with white dashes on the margins of its leaves, and 
with a white terminal papilla. The branchia is reddish-yellow, with a few scattered spots 
upon the branchial lamellae. 
The form of the body is as usual. The frontal margin is somewhat strongly developed; 
the dorsal margin does not stand out much, its lateral lobes in front of the branchia are 
rounded and but feebly developed ; the dorsal process is conspicuous and strong, and 
convex on the upper surface, its lateral margins somewhat bent beneath. The holes of 
the rhinophoria are rounded, with an inconspicuous margin ; the stem of the rhinophoria is 
powerful, and about the same length as the strongly developed club, which latter is 
provided on either side with from thirty-five to forty thin leaves. The branchial 
cleft, when the branchia is retracted, is of a rounded triangular form, 2 '25 mm. 
in diameter, its smooth margin inconspicuous. The hinder end of the branchia is 
slightly rolled up, the gill has twelve leaves, which are frequently divided at the end 
into two to four twigs, themselves again branched. 1 The anal papilla is directed 
obliquely forwards, and is situated in the branchial circle enclosed by its two 
extremities ; it is short and cylindrical in form, about 1 mm. high, truncated above, 
greyish in colour, with whitish stripes and points ; its margin is finely crenate ; at its 
base in front and to the right is the fine renal aperture. The tentacles are short papillae 
on either side of the mouth. The foot is rather weak. 
The intestines are not visible from the outside. The peritoneum is colourless. 
The central nervous system I have already 2 described. The common commissure is 
about one-third of the transverse diameter of the central nervous system, and is evi- 
dently formed of three fused strands, of which the pleural is actually separate for some 
distance on the right side. The distal olfactory ganglia are situated at the base of the 
rhinophoriai club, and form two bulb-shaped swellings of the nerve, lying one above the 
other, from which, as usual, numerous branches are given off. The short oval buccal 
ganglia are united by a short commissure, about equal in length to one-fourth of the 
longest diameter of the ganglia. The small gastro-cesophageal ganglia are short-stalked. 3 
One of the nervi optici had a quantity of black pigment, the other not. The otocysts 
are visible, with a lens, as chalk- white points ; they are sessile and sack-shaped, somewhat 
flattened (PI. III. fig. 14), of about T 4 mm. greatest diameter ; each contains about three or 
four hundred round and oval otoconia, yellowish in colour, and about '015 mm. in 
diameter. The leaves of the rhinophoria are almost completely devoid of the hardened cells. 
In the skin of the back and of the sides of the body there were numerous small hardened 
cells, but no larger ones. In the outer neurilemma of the central nervous system, 
especially round the cerebral ganglia, were a number of spicules, more or less calcified 
and roundish or longish oval in shape, reaching *08 mm. in diameter (PI. III. fig. 15), 
lying isolated or in groups. In the interstitial connective tissue of other parts of 
1 Bergli, loc. cit., Taf. xlviii. fig. 15. 2 Loc. tit., p. 395. 3 Loc. tit., Taf. xlix. fig. 6. 
(ZOOL. CHALL. EXP. — PART. XXVI. — 1884.) Cc 1 1 
