36 
| ] 
Depth in Fathoms. 
THE VOYAGE OF H.M.S. CHALLENGER. 
Name. 
Wilson, Pycnogonida of New England, Transact. Con- 
nect. Acad., vol. v. p. 4, 1880. In the Ann. and Mag. 
of Nat. Hist., 5th series, vol. iii. p. 283, 1879, Slater 
describes a variety of this species, which, being very 
slender, is named P. litorale, var. tenue, Slater. It 
was dredged by Capt. St John and placed in the British 
Mus. Catal., 78, 11. 
Geographical Distribution. 
Chili (Gay) ; Mediterranean ; 
Japan. The greatest depth 
from which it has been ob- 
tained in Europe is, as far 
as I could ascertain, 53 
fathoms (“ Knight Errant”), 
whereas it was dredged by 
Smith and Harger (1872) at 
- adepth of 430 fathoms, east 
of St George’s Bank, N. lat. 
41° 25’, long. 65° 42’ 3” W. 
(4) '(t)Pycnogonum australe, Grube, Jahresb. der Schles. Ges. | Australia. 
f. vaterl. Cultur, p. 54, 1869. Of this species only a 
larva with three pairs of legs has been examined. It 
seems to be a species with auxiliary claws at the ends of 
the legs. 
DESCRIPTION OF THE SPECIES DREDGED DURING THE CHALLENGER EXPEDITION. 
Nymphon, Fabr. 
Nymphon hamatum, nu. sp. (Pl. 1.). 
Diagnosis.—Body slender, body and legs almost entirely smooth; eyes obsolete, 
auxiliary claws wanting; second joint of the palpi longer than the third; second joint 
of the leg longer than the first and the third; second tarsal joint of the leg longer 
than the first. 
Description—tThe body is slender, and the lateral processes are separated. The pro- 
boscis is large, almost one-third the length of the body, slightly swollen in the middle, 
and again at the extremity. The mouth is triangular, not very large. The cephalo- 
thoracic segment (with the base of the mandibles swollen) is almost as long as the 
proboscis. The eyes are obsolete, represented only by two small knobs behind the lateral 
process of the cephalothoracic segment. The abdomen is rather large; the mandibles 
large, with the basal joint as long as the rostrum ; the claws of the chelz are elongated ; 
the immovable claw more strongly curved than the movable one (PI. I. fig. 3). _ Both 
claws are armed with spines; on the movable claw they are more numerous and larger 
(fig. 8). Seen but slightly magnified, the mandibles are smooth ; when greatly magnified 
they show small hairs all over the surface. 
The palpi are slender, longer than the rostrum ; the second joint is longer than the 
third, the fifth longer than the fourth; they increase in length as follows :—First, 
