REPORT OH THE HUDIBRAHCHIATA. 
53 
rhinophoria was about 1’5 mm., of the branchial tufts 2 mm. ; the breadth of the base of 
the foot 5 '4 mm., the length of the tail 5 mm. 
The colour of the animal was whitish, the gill yellowish, the tip of the papillae black, 
the clubs of the rhinophoria greenish-grey with a white tip. At the neck (fig. 9) the 
bulbus pharyngeus and central nervous system with the black eyes were visible from 
the outside, and the liver behind the branchia and the hermaphrodite gland at the base 
of the first right papilla. 
The form of the body is remarkable on account of the huge dorsal pap film (fig. 9, a, a), 
and is short and clumsy. The mouth is rounded, a little funnel-shaped ; there is no trace 
of any tentacles . Above the quite even frontal margin, at the neck are the circular 
apertures for the rhinophoria, out of which project the tips of these ; the club of the 
latter has a great number (50 V) of the usual thin leaves. The branchia stands about on 
the middle of the back, and is formed of three tufts ; the right hand one gives off a 
strong branch at its base. Behind the branchia is the low anal papilla, in front to the 
right of which is the renal aperture. From the lateral margin of the back, which is hardly 
to be distinguished from the sides of the body, arises in the neighbourhood of the rhino- 
phoria, the first smaller pair of papillce ; further back, behind the region of the branchia, 
the second pair (fig. 9, a, a), which is twice as large as the first pair. The papillae are 
cylindrical or club-shaped, somewhat narrower below, rounded above, and slightly excavated 
at the apex. The tail is strong. The sides of the body are high, less so anteriorly and 
posteriorly ; the wrinkled genital opening lies behind the first papilla on the right. The 
foot is rather broad and strong ; in front its angles are small ; the lateral brim projects 
about "8 mm. from the sides of the body ; posteriorly it ends in a rounded apex. 
The central nervous system is not much flattened ; the cerebro-pleural ganglia are 
reniform, the two divisions being very distinct ; the pleural are thicker and somewhat 
larger than the cerebral. The pedal ganglia are roundish and . a little smaller than the 
pleural. The three commissures are separate, not quite as long as the diameter of the pedal 
ganglia. The proximal olfactory ganglion nearly sessile and bulb-shaped ; the distal one 
much smaller, roundish, and situated at the base of the rhinophorial club. A small 
ganglion opticum gives rise to the optic nerve, which is nearly double as long as the 
diameter of the eye. The buccal ganglia are a little larger than the proximal olfactory 
ganglia, round in shape and united by a commissure about equal in length to the diameter 
of the ganglia. A strong nerve could be followed throughout the whole length of the 
papillae as far as the apex. 
The eyes are large, and provided with abundant black pigment and a yellow lens. 
The otocysts are rather smaller than the eyes, and contain a small number of otoconia. 
The leaves of the club of the rhinophoria are delicate, and contain no spicules. The shin 
and interstitial connective tissue are without spicules, and contain an enormous mass of 
variously sized unicellular glands. On the apex of the dorsal papillae the skin was thicker, 
