AMPHIPODA. 21 
joint curved, oblong, almost as long and three times as wide as the next three; third 
and fifth subequal, fourth rather shorter; dactylus slender, two-thirds of the length 
of the preceding joint. 
Second pereopods: Side-plates subtriangular, front margin straight, lower and 
hind margins convex. The legs as in the first pair. 
Third perzopods: First joint narrow, oblong, straight. 
Fourth and jifth pereopods alike ; first joint oval, deeper than wide, hind margin 
smooth. 
The wropods are subequal in extent and sparsely spimous; the peduncle of the 
third pair is subequal to the first joint of the ramus, which is also subequal to the 
second joint. 
Telson not reaching the end of the peduncle of the third uropods, narrowing 
rather abruptly to a point with two spines on each side before the middle and one 
beyond. 
Length, 3 mm. 
THAUMATELSON. * 
Thaumatelson, A. O. Walker, Ann. and Mag. Nat. Hist. XVIIT. (1906), p. 15. 
General characters of Metopa. 
Palp of the first maaille two-jointed. 
First gnathopods distinctly subchelate. 
Telson large, entire, oval and set in a vertical plane on its longer edge. 
T. HERDMANI. (PI. 7, fig. 11.) 
. herdmani, A. O. Walker, Ann. and Mag. Nat. Hist. XVIII. (1906), p. 15. 
W.Q., Oct., 1902; 8-net, Hut Point; from Sponges. Gne spec. W.Q., 13 Feb., 
1904; D-net, Hut Point; one. 
Body as in Metopa: the fourth side-plate unusually large, covering the bases of 
the last three pairs of perzeopods. The last two pleon segments with a postero-dorsal 
tooth. Segments of the urus coalesced. 
Antenne: subequal, longer than the head. 
Upper antennze: First joint longer than the second, which is rather shorter than 
the third, and has the upper margin produced ; there is no appendage. Flagellum 
shorter than the peduncle. 
Lower antenne : Peduncle subequal to that of the upper, second and third joints 
subequal and together longer than the flagellum. 
Mawillipeds: Inner lobes reaching half-way up the narrow outer lobes, apparently 
divided rather further down than in Metopa; outer lobes, as in Proboloides, a mere 
slight expansion of the inner margin of the basal joint, which is produced distally half 
the length of the next joint, which, as well as the remaining joints of the palp, is short 
[Rectius Thaumatotelson—Eb. ] 
