OF THE ‘PORCUPINE’ EXPEDITIONS. 405 
antenna. The tentacular cirri are larger than the latter, and arise from the ordinary basal 
process. There is a little brownish pigment on the head. The proboscis is extruded, 
and has the usual papille at the tip, besides two superior and two inferior brownish 
fangs and about four short blunt teeth on each side. The dorsal cirrus is a short, 
almost conical, process, with an enlarged base and tapering tip. The ventral is longer 
and more slender, but does not reach the extremity of the fleshy part of the toot. 
There is the usual soft process between the dorsal cirrus and the tip of the foot. 
The uniramous foot bears superiorly curved subulate bristles finely serrated from 
base to apex, and more slender than those represented in Pl. LX XII. fig. 14 (from the 
ventral edge of the foot); others are more delicate, the tip beyond the enlarged base 
having widely distant and opposite sete (Pl. LX XII. fig. 12, one of the smaller ex- 
amples). The stout bristles (fig. 13) have a long terminal serrate whip, and the shaft 
at the base of the latter has a blunt hook and a brush of sete. A tuft of bristles, 
similar in structure to the superior series, occurs at the ventral edge (fig. 14, anda 
lateral view in fig. 15); but there are none with the widely distant sete on the terminal 
portion. The most remarkable feature is the entire absence of the “brush-like” bristles 
so characteristic of Panthalis erstedi, Kbg. 
Such scales as remained presented a peculiar funnel-shaped aspect, the anterior half 
being pale, the posterior madder-brown, deepest on the under surface. Microscopically 
they had a reticulated appearance, from the pentagonal or hexagonal arrangement on 
the posterior half; the aspect, indeed, resembled a section of cork. The surface was 
also studded with minute papille and brownish granules. 
SIGALIONID. 
STHENELAIS ATLANTICA, 0. s. Dredged in 305 fathoms, at Station 2, 1870. 
A portion of the anterior region of the body only is present. The head is furnished 
with four distinct eyes, observable from the dorsum and situated at the base of the 
tentacle, close together on each side. The scales are somewhat rounded or ovoid in 
front, reniform posteriorly, covered with sparsely distributed but distinct papille, and 
haying throughout the greater extent of the margin a fringe of short clavate papille, 
longest exteriorly. The papilla are decidedly longer and more slender, as well as 
more numerous, than in S. zetlandica; and palpocils occur frequently on the summit 
(Pl. LX XII. fig. 16). 
The superior division of the foot bears finer bristles, with more delicate serrations, 
than in S. zetlandica; but the papille have similar dimensions.. The inferior branch 
possesses similar papillz with warts or secondary processes at the tip: the lobes of this 
division are not boldly marked. The superior ventral bristles (PJ. LX-XII. fig. 17) have 
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