REPORT ON THE AMPHIPODA. 855 



(Ediceroides ornata (Stebbing) (PI. LXIV.). 



1883. Acanthostepheia ornata, Stebbing, Ann. and Mag. Nat. Hist, ser. 5, vol. xi. p. 203. 



Two antero-dorsal ridges on the bead lead to the neck of the very pronounced rostrum, 

 which is dorsally, inferiorly, and laterally carinated, the top convex, the sides con- 

 verging to a point reaching beyond the first joint of the upper antenna, the lower 

 carina produced to a point a little less advanced than the upper one ; the whole surface 

 except the neck, the carinse, and the extreme tips being occupied by the eyes ; a small 

 rounded lobe projects on either side of the base of the rostrum, and the sides of the head 

 are studded with tubercles. In the peraeon the hinder margia of each segment is adorned 

 all round with teeth alternating in size, the succession of large central teeth almost 

 constituting a continuous carina, while on the other hand the transverse depressions at 

 the base of each segment give the back, viewed laterally, an imbricated appearance. 

 The fringing teeth vary in number from nine to seventeen, presenting an appearance like 

 that of the projecting edges of the septa in many Corals. The seventh segment has 

 a second row of teeth in advance of the hinder margin, the other segments having also 

 some lateral tubercles in this position, and the lateral margins of the segments being 

 fenced in, as it were, with long flattened tubercles. The first pleon-segment has a fringe 

 of very small teeth, and in front of the row a large median tooth flanked by some small 

 ones not in line ; the second segment has a long central ridge with small teeth on its 

 flanks, but none on the hind margin ; the third segment, dorsally much longer, has the 

 central ridge without other ornament, and in this respect is resembled by the three 

 following segments, which are very small ; the first three segments have the postero- 

 lateral ang;les rounded. 



The Eyes are long and narrow, separated only by a narrow carina, their outline on 

 the outer side determined by the shape of the rostrum ; the ocelli are numerous, and the 

 colour remains dark after preservation in spirits for many years. 



Upper Antennae more slender than the lower ; first joint narrowing distally, second 

 shorter than the first, with a spine near the middle of the upper margin and one at the 

 apex, also two feathered cilia at the apex below ; the third joint only half as long as the 

 second and much narrower ; the flagellum broken oS"; the feebleness of the third joint 

 of the peduncle is suggestive of a small flagellum, and the peduncle itself reaches little 

 beyond the base of the fourth joint in the lower antennae. 



Lower Antennae. — First joint but little expanded ; a very small but distinct gland- 

 cone at the lower basal part of the second joint, the two joints being at this part clearly 

 distinguished, though at the upper part they are quite coalescent ; the upper margin 

 distally produced ; the third joint nearly as broad as long ; the fourth joint much 

 narrower, but more than three times as long, carrying short spines and plumose cilia on 

 various parts ; the fifth joint rather more than twice as long as the third, narrower 



