46 
THE VOYAGE OF H.M.S. CH ALLEN GEE. 
the rhinophorial sheaths 2 mm., of the rhinophoria 2 mm. ; the length of the branchial 
tufts from ‘5-2 mm. ; the breadth of the foot 6-8 mm. The colour differed in the two 
specimens, one being whitish-yellow and the other more grey ; in both the rhinophoria 
were of a whitish tint, the branchial tufts, anal and genital papillse white or lemon-yellow, 
and the foot yellow. 
The form of the body is similar to that of the other members of the same genus. The 
frontal veil is semilunar in shape with a notch in the middle line, it has from fifteen to 
twenty shallow indentations ; the tentacles are large, and present no peculiarities of form; 
the sheath of the rhinophoria is short and cylindrical, with plain margin ; the club-shaped 
extremity of the rhinophoria is provided with about ten leaf-like appendages, the apex of 
the hindermost of these is very strong. The dorsal surface is almost even, with scattered 
minute tubercles ; on the but slightly prominent margin of the back are from twenty-five 
to thirty variously sized small branchial tufts which present the usual structure. The 
sides of the body are rather high and quite smooth. The genital and anal papillse and 
the renal pore occupy their usual positions. The furrow on the anterior margin of the 
foot is very distinct ; the tail is only present as a rudiment. 
The intestines are not visible through the body- wall. 
The centred nervous system has no peculiarities ; the pedal ganglia are somewhat 
larger than the cerebral. The long principal commissure gives off a nervus genitalis. The 
buccal ganglia are large and oval in form ; the gastro-oesophageal are very small. 
The otolithic vesicles are situated at the anterior margin of the pleural ganglia. Each 
contains about one hundred otoconia of the usual kind. 
The bidbus pharyngeus is large, and measures from 7 "5-10 mm. in length, 5-6 mm. in 
height, and 6-7'25 in breadth. The labial disk, as well as the posterior part of the mouth- 
tube, is of a dark blackish-brown colour. The mandibles are of a greenish-yellow hue, the 
masticatory edge coal black, and the adjacent part brownish-black. The form of the 
mandibles (PL XI. fig. 16) as usual. The masticatory edge appears even under the lens; 
nevertheless it is provided with several, mostly eight or nine, series of short, thick, strong 
plates and teeth, which gradually increase in size towards the anterior margin, the fore- 
most measuring as much as ’12 mm. (fig. 17). The free margin of the wings behind the 
mandibles is blackish. The tongue is of the usual form, and blackish in colour along the 
median line of the under surface ; the radula varies from mahogany-brown to black, and 
contains twenty-four and twenty-seven series of teeth in each of the two individuals 
examined respectively ; posteriorly there are seven and thirteen developed, and three not 
fully developed series, the total number of series being thus thirty-four and forty-three 
in each of the two specimens. In the hindermost series there were thirty-five teeth in one 
specimen and forty- two in the other, and the number of teeth further back within the 
sheath of the radula increases to thirty-seven and forty-five. The breadth of the most 
anterior median tooth is about '22 mm., of the hindermost about ’28 mm. ; the height of 
