82 THE VOYAGE OF H.M.S. CHALLENGER, 
with a gland situated in the interior of the jomt. This tubular process has been observed 
neither by Kréyer nor by Béhm. Probably it occurs only in the male sex. The fifth 
joint is as long as the fourth, the sixth a little longer. The first tarsal joint is short, the 
second comparatively long, armed with a claw and two long auxiliary claws. Joints one 
to four have only a few hairs, while joints five to eight are covered by numerous, and 
for the most part, comparatively long and stout hairs. 
Habitat.—This species, according to Kréyer, is found off Rio de Janeiro, whereas 
Béhm describes specimens collected by the German man-of-war, the “Gazelle,” in the 
Straits of Magellan, and on the Patagonian coast, at a depth of 30 to 42 fathoms. One 
specimen was dredged by the Challenger off Bahia. Depth, from 7 to 20 fathoms. 
Observations.—Béhm considers:this species a Pallene. I think, however, there can 
be no doubt that it is a true Phowichilidium in the sense of Kroyer. To take the num- 
ber of joints of the ovigerous legs as a decisive proof in this matter is, I think, not 
safe. The ovigerous legs of the Pallene (Pallene lappa, Bohm) which Bohm examined, 
were only seven-jointed, and for that reason alone the specimen cannot be considered 
as a Phoxichilidium. Of much greater value, I think, is the form of the ovigerous leg 
itself, the form of the last joints, of the spines with which they are furnished, &c., also 
the whole form of the body, the manner in which the cephalic part of the cephalothoracic 
segment overhangs the proboscis, &c. 
Another question is, of course, whether it would not be convenient to class as a separate 
genus those forms of Phoxichilidiwm which have ten-jointed ovigerous legs, probably 
always present in both sexes. But before taking this step, the different forms ought to 
be better known, and for this a close study of full-grown specimens of both sexes is neces- 
sary. The genus Anoplodactylus of E. B. Wilson cannot be accepted, because neither 
the presence or absence of auxiliary claws, nor the fact of the ovigerous legs being five- 
or six-jointed, has any real importance. 
Phoxichilidium insigne, n. sp. (Pl. XIV. figs. 5-7). 
Diagnosis.—Body slender, with large intervals between the lateral processes. Pro- 
boscis cylindrical, inserted ventrally far posteriorly between the two ovigerous legs. Man- 
dibles two-jointed, the first joint bearing the second laterally. Ovigerous legs six-jointed. 
No auxiliary claws, Legs and mandibles furnished with large conical knobs. 
Description.— 
Length of the proboscis, 2 mm. 
Total length of the body, . ‘ é : 3 é Go ai 
Length of the abdomen, ‘ : f ‘ ; , : Ober 
Length of the ovigerous leg, : : i : : 5 4:2 ,, 
Length of the leg of the first pair, . ; : 5 F ; 19 
Of this most curious form, unfortunately, only a single specimen—and that much 
