BrriANO TILI. K. sv. VET. AK.\T). H.\M)T.1NG.MI. BANU. 4. N.O 8. 21 



serratcd, beset with straight spines, and carries moreove v long, 

 pluraelike ciliated bristies of a stnicture peculiar to this joint. 

 Tliey are, namely, provided with 2 to 5 eggshaped bladders or 

 follicles supported ou short peduncles and placed on a zigzag 

 line along the middlc of the bristle (Pl. IV, fig. 77). A deli- 

 cate muscle-string is seen rimning to tlie base of each bristle, 

 so that tliey may be to a certain degree capable of motion. 

 The outer side of the joint presents groups of short strong 

 spines, 3 — 4 in each (Pl. II, fig. 13 a). The carpits is as 

 broad as long. Its front-margin is arched, coarsely serra- 

 ted, beset with straight spines (Pl. III, fig. 20). Its lower 

 margin is almost straight, with small, short ciliated bristies. 

 The posterior margin is feebly arched, coarsely serrated, carry- 

 ing long, plumelike, doubly ciliated bristies (Pl. III, fig. 53). 

 The propus is of the same length as the carpus, but slender 

 and linear, it can be folded iip to the lower margin of the 

 carpus just as the blade of a claspknife; its fore-margin is 

 feebly arched, devoid of bristies or spines ; the hinder one 

 almost straight with 6 — 7 groups of strong spines rounded at 

 the point (Pl. III, fig. 20). 



The fifth pair of pe7'eiopoda (Pl. II fig. 14) is a little shortcr 

 than the fourth one and like that articulates with the coxa 

 through the hinder margin of the basis. It diffcrs from the same 

 pair in other amphipodes by being directed principally back- 

 wards instead of forwards. This direction is also necessary, 

 for it is this pair of legs that has the function of sheltering 

 the lower side of the hinder body. The basis is very large, 

 bigger than in any of the preceding pairs of legs; its fore- 

 margin is of an irregular outline, the hinder part strongly 

 expanded, semicircularly rounded. The före margin is coar- 

 sely serrated and carries on each tooth a long spinelike bristle, 

 which on one side is very finely ciliated in its uppcr half, 

 whereby it gets the appearance of a fine featliersaw (Pl. 

 III, fig. 34). Beyond these the foremost börder carries 

 long, plumelike ciliated bristies. The hinder börder is quite 

 smooth without hairs or bristies. The ischium is as usually small 

 and short, it carries in the anterior lower angle a bundle of 

 3 — 4 spinelike bristies similar to those just described. The 

 meros is not long, but through the expansion of its hinder 

 part very broad. The foremargin is feebly arched, coarsely 

 serrated, each tootli carries 3 — 4 long straight spines, in the 



