228 Prof. M‘Intosh’s Notes from the 
base, and tapers towards the tip. The tentacle, which is 
internal and superior to the former, is subulate and much 
more slender. It springs from the front of the head at the 
inner edge of the former and is longer. In the median 
line between the posterior pair of eyes is a comparatively 
short subulate median tentacle, which is easily overlooked, 
especially in an indifferent preparation. ‘The edge of the 
proboscis projects in the preparations, and in the median line 
dorsally is a prominent papilla, which lies under the anterior 
border of the snout, and Claparéde states that in life, in his 
form, it is surrounded by a circle of cilia. In these prepara- 
tions the eyes are considerably larger than in examples of 
T. Claparédit from Naples, and the tentacular cirri larger and 
longer. 
Body about 14 in. long, massive anteriorly, though in life 
it tapers a little towards the head,as Delle Chiaje and Claparéde 
show in 7’. Claparédii, and more distinctly towards the tail. 
It is rounded or convex dorsally, iridescent and minutely 
ringed, somewhat flattened ventrally, and with a deep median 
groove. ‘The tail terminates in a free median vent, with a 
long cirrus at each side. The tentacular cirri are 8 in number 
on each side, and are long tapering organs springing from a 
massive basal segment, which is furnished internally with 
spines. ‘The first four segments are fused, but, as Claparéde 
showed in his species, they receive special nerve-twigs, and 
thus he thinks the view of De Quatrefages that all the cirri 
arise from the buccal segment is untenable. The proboscis 
in situ presents a somewhat thick, frilled, anterior edge, 
the blunt papilla alluded to projecting from the central 
fold of the dorsal arch. As Claparéde pointed out in 
T. Claparédii, chitinous jaws are situated in the present 
species at the anterior end of the organ én s¢tu in the mid- 
dorsal and mid-ventral lines. ‘The dorsal teeth at the free 
edge have the shape of a bifid fan, whilst the ventral 
resembles a conical tooth. The massive wall of the organ 
becomes more chitinous and of a brownish hue, and (extending 
backward quite a third of the length of the bedy) terminates 
at a prominent aperture (the gut) in the centre of its posterior 
wall. ‘Two flattened lateral ceca, also with dark pigment, 
occur in this region. ‘The inner surface of the proboscis has 
two thick pads behind the teeth in front, a transverse bar on 
each side in the middle, and the posterior half is subdivided 
by deep grooves. It seems to be an efficient prehensile 
and suctorial organ, and its great proportional size probably 
renders its function important. 
The bristled feet (Pl. I. fig. 5) are 16 in number, long and 
