24 THE VOYAGE OF H.M.S. CHALLENGER. 



The latter appendages are illustrated in fig. 5. The inner margin of the stipes is 

 furnished with five of the hook-like processes peculiar to these appendages, which alter- 

 nate in position with those of the corresponding appendage of the opposite side. The 

 palp is five-jointed, the two distal joints being more slender than the three proximal. 



The thoracic appendages are slender and moderately elongated, they terminate in a 

 single claw. Some of these appendages were defective, but they appear to be all more 

 or less similar. The first pair, or perhaps the first two, differ in that the fifth joint is 

 shorter and stouter than it is in the succeeding appendage (see figs. 8, 9). 1 The first 

 four pairs arise from the antero-lateral margins of their segments, the three posterior 

 pairs from the posterolateral margin. 



The uropoda (fig. 6) consist of an elongated, slender basal joint, with which air 

 articulated two rami, the innermost of which is longer as well as stouter than the outer ; 

 the inner ramus shows indications of division into two joints. 



Munna, Kroyer. 

 Munna, Kroyer, Naturhist. Tidsskr., Ed. ii., 1839, p. G12. 



Definition. — Body of the male in most cases elongated and narrow, that of the 

 female broad and oval. Antennae narrower in the posterior region of the thorax. Head 

 very broad, and one-fourth or one-fifth of the length of the body. Eyes usually fixed on 

 prominent stalks which project from the side of the head. Antennules about the length 

 of the head, anterior longer than the body, with a fiagellum shorter than the peduncle ; 

 fourth and fifth joints of the peduncle elongate. Thoracic appendages biunguiculate, 

 the first pair forming short and powerful prehensile appendages, the following six 

 pairs long and slender, gradually increasing in length, and the last three pairs markedly 

 longer than the foregoing. Abdomen without a single anterior segment, free, elongated 

 quadrangular, narrower than the thorax ; uropoda in the form of short stumps, or absent. 



Remarks. — The affinities of Munna are with Pleurogonium and its immediate allies. 

 though in having biunguiculate thoracic appendages, this genus is now nearly related to 

 Jsera, Janira, &c. In all other points, however, except in the presence of well-developed 

 eyes, Munna presents very close resemblances to Pleurogonium. 



Only five species of this genus are at present known, all of which are inhabitants of 

 the shallow water off the coasts of Great Britain, Norway, North America, &c; in the 

 present Report I have two new species to add, both of which are from shallow water off 

 the Island of Kerguelen ; there is a third specimen from the same locality, but it is verj 

 small, and I believe is similar, so that I have not thought it advisable to describe it. 



1 The difference lias not been rendered so marked in the figures as it ought to have been. 



