150 Mr. A. 0. WalkiT on 



Length of liorns 38, of horn-core 27. 



Hah. Seniliki Forest, Eastern Congo. 



Type. Adult male. The skull is B.^[. no. 5. 10. 21. 3. 

 Collected and presented by Col. J. J. Harrison. The 

 mounted skin remains in the latter's collection. 



XXIII. — Preliminary Descriptions of n'tw Species of Amphi- 

 poda from the 'Discovery'' Antarctic Expedition, l'J02- 

 1901'. l^y Alfred O. Walker, F.L.S., F.Z.S. 



[Concluded from p. 18.] 



Iphimedia echinata, sp. n. 



W.Q. 24/9/02, Hut Point, one; 24/8/03, Hole 12, three 

 large, 30 ram., and about twenty-five young; 26/9/03, Hole 

 12, one 45 mm. long. 



Body : first segment of the raesosome longer than the second ; 

 posterior angles aloiost rectangular ; next four segments 

 subequal, with acute posterior angles ; the fifth and sixth 

 segments more or less dentate behind; seventh dorsally 

 depressed and narrowed below, postero-dorsal dentitiou 

 coarser. The pleon-segments have a strongly dentate dorsal 

 carina, with smaller teeth on each side of it ; posterior angle 

 of the second and third acute and upturned, the latter with a 

 longer curved tooth above it. The first urus-segnient is as 

 long as the, two next united, and has a dorsal depressioa 

 followed by ^, group of upright teeth; the second and third 

 are smooth. Side-plates: the first three pairs narrow down- 

 wards to a point, the second and third curved; the fourth, 

 fifth, and sixth have a strong tooth with serrate edge directed 

 outwards. 



Head: rostrum as long as the rest of the head, acute, 

 decurved; ocular lobes rounded; eyes prominent, round, 

 colourless. 



Upper antennce : first joint with two parallel distal teeth 

 on the upper margin ; second with a long serrate tooth on 

 the U})per and a short one on the lower margin ; third joint 

 short, simple. First joint of fiagellum as long as the next 

 three. 



Loioer antennce subequal to the upper ; a prominent curved 

 tooth on the upper side of the i>asal joint. 



First gnathopods : first joint widest in the middle; wrist 

 rather shorter than the hand, \Vhich is chelate, with short 

 spines on the end of the produced hind margin. 



