396 PERCY SLADEN TRUST EXPEDITION. 
29. Blasmopus insignis, Chevreux. 
I, Egmont Reef. Three: length of male 9 mm. 
30. Elasmopus serrula, A. O. Walker. 
II. Zanzibar, 1901. Many, mostly immature: length of ¢ 7 mm., 2 with ova 
4. mm. 
TIT. Suez: among Corals. Two. 
In addition to the characters given in the description of this species (‘ Report on 
Pearl Oyster Fisheries, 1904: Amphipoda, p. 277, pl. viii. fig. 37), attention may be 
called to the hairiness of the antennze and the shortness of the uropods, the telson, viewed 
sideways in the whole animal, reaching almost to the end of the rami of uropod 3. 
It is a question whether this can be considered more than a variety of HL. rapax. 
31. Hlasmopus spinidactylus, Chevreux. 
Elasmopus spinidactylus, Chevy. Bull. Mus. d’Hist. Nat. 1907, No. 6, p. 412. 
e) 53 » Mém. Soe. Zool. de France, 20° année, 1907, No.4 (juin 1908) p. 486. 
J. Egmont and Praslin Reefs. Several. 
Female. 
Head : lateral lobe flattened in front. 
Side plate 1 small, rhomboidal, front margin straight; 2 irregularly subquadrate ; 
5 three times as wide as deep. 
Pleon segment 3: hind margin convex, obscurely serrate; lower margin straight ; 
posterior angle a little produced and upturned, subacute. 
Byes dark, irregularly oval, smaller than diameter of 1st joint of ant. 1. 
Antenna 1 reaching 5th segment; flagellum 14-jointed, a little shorter than the 
peduncle; both very setose. Accessory flagellum 2-jointed. 
Ant. 2 barely reaching the end of the peduncle of ant. 1; flagellum 7-jointed. 
Mouth-organs and maxillipeds normal as in /#. rapaa. 
Gnathopod 1 less than half as large as gnathopod 2; hand longer than wrist, hind 
margin evenly curved, palm undefined. 
Gnathopod 2. Second joint 3 the length of the hand, longer than the next 3 united ; 
wrist short, produced along the front margin of the hand; this is broadly ovate, almost 
as large as in the male; palm ill-defined, uneven, densely setose. Dactylus reaching the 
middle of the hind margin. In the male the ovate hand has the outer side of the setose 
palm, near its proximal end, furnished with a strong recurved tooth, behind, or inside, 
which is a hollow in which the point of the dactylus fits; a spinous ridge between the 
tooth and the base of the dactylus. 
Perzeopods 1 and 2: 1 is stronger than 2; 2nd joint rather narrow, widest near the 
middle, as long as the next 8. Dactylus with 3 tooth-like spines, increasing in length 
distally, on the concave margin: it appears to be hollow near the extreme point, which 
is terminated by a minute knob. 
Perzeopod 3: second joint with the front margin somewhat produced downwards ; 
hind margin obscurely serrate, the posterior angle with a notch just above it. Dactylus 
as in per. 1 and 2. 
