154 
THE VOYAGE OF H.M.S. CHALLENGER. 
single curved spinous process at the tip, and three long, delicate spines. The abdominal 
region is curved under the body, and shows about live segments, the last being 
bifid. Each of the divisions of the terminal segment bears a clavate style, fur- 
nished with a few fine hairs. The tips of the styles, indeed, are almost globular. 
The ovigerous sacs exceed the length of the body, and form large sausage-shaped 
processes filled with ova. The body of the specimen is also filled with ova. The genus 
is characterised by the shape of the body, the structure of the antennse, and the form of 
the feet and post-abdomen. 
Leanira ja])07iica, n. sp. (PL XXII. fig. 3 ; PI. XIVa. figs. 1, 2). 
Habitat . — Dredged off Kobe, Japan, in 8 to 50 fathoms. 
A small and fragmentary specimen, having a diameter, including the bristles, of 3 mm. 
The head (PI. XXII. fig. 3) is proportionally large, and for the most part tinted by 
pale reddish-brown pigment. Two very conspicuous, round, black eyes are situated 
towards the front of the head, just behind the tentacle, and from each a pale band passes 
backward. Another pair occupy the inferior surface of the snout beneath the tentacle, 
the pigment being somewhat crescentic in shape, probably because a “lenticular” 
structure is present. The latter eyes look downward and forward. The tentacle is a 
simple ta23ering process, and on each side of its basal region is the spathulate appendage. 
The palj)i are of moderate length, smooth, and finely tapered. 
The scales are absent. So far as can be observed, the structure of the first and other 
feet is normal. Each foot (when fully developed) has a well-formed branchial process 
superiorly, but the ^preparation is so injured that no reliable observations can be made 
concerning the ciliated 2 >ads. The dorsal division bears the usual slender serrated bristles, 
the upper being more distinctly, and the lower less distinctly, s^finous. At their base are 
several long cuticular papillse. 
Anteriorly the ventral grou^) occasionally presents superiorly a single bristle with 
whorls of spikes (PI. XIVa. fig. 1), which has not hitherto been observed in other sjpecies 
of Leanira. The rest of the bristles are translucent, less dilferentiated into a slender 
sujperior and inferior series, and with a stouter median group than in the previous species 
(PL XIVa. fig. 2, one of the upper and larger examples). The canaliculated tij) is of 
moderate length, and the markings well defined. The inferior bristles have shorter tips. 
The extremity of the ventral cirrus extends to the base of the bristles. This division of 
the foot also has numerous and rather translucent jpajpillm. 
In transverse section the ventral longitudinal muscles show a largely developed 
dorsal fold, and their inner angles appear to approach each other somewhat closely, so 
that the area is narrowed sujperiorly. The hypodermic region of the proboscis and its 
two nerves on each side are well marked. 
