342 TAGH SKOCSF'.ERri 



the middle of the joint and has .short hairs; it is about as long as the next to the outermost 

 of the distal bristles on the third endite. The bristle on the boundary between the basale and 

 the first endopodite joint is rather short, about as long as the proximal bristle on the outside 

 of the third endite, and has short hairs. The exopodite is very small, almost verruciform, 

 and is displaced distally almost to the middle of the long first endopodite joint. Of its three 

 bristles the two distal ones are subequal and about half the length of the first endopodite joint; 

 the proximal one is only about a quarter of the length of the distal ones. One of the distal ones is 

 sparsely furnished with long hairs, the other is bare; the short proximal one has short hairs. 

 Endopodite: The first joint has numerous transversal creases on its outside; one of these 

 creases, somewhat distally of the exojjodite, seems to extend across the joint; it can, however, 

 scarcely be considered as an indication of a further division of this joint. The postero-distal 

 part of this joint is not strongly chitinized nor developed as a cutting edge. Distally this joint 

 has (fig. 17) two bristles on the anterior edge (denoted by x in the figure), one rather long and 

 powerful, somewhat bent into the shape of a claw distally and having there a thick cushion 

 of fine, soft hairs, the other considerably weaker and only about half the length of the former 

 one and furnished at the middle with a few long, stiff secondary bristles. On the posterior 

 edge there are three bristles distally (denoted by y in the figure). Two of these are of about 

 the same length and strength as the longer of the two on the anterior edge and are very strongly 

 pectinated distally, the thiid is weak, bare and only a little more than half the length of the two 

 former ones. The end joint (fig. 17) has thirteen bristles: Four a-bristles, of which the next to 

 the posterior one is of about the same type and size as the two powerful posterior distal bristles 

 of the first endopodite joint, but with a still better developed pectination, the three others are 

 somewhat shorter, rather weak, and bare. There seems to be no doubt that the other nine 

 bristles on this joint are to be homologized with the groups of b-, c- and d-bristles on the end 

 joint (jf other forms of this sub-family which are described in this work; this homologization 

 is made very difficult, however, by the fact that the bristles are situated very close together 

 and are somewhat displaced. The attempt at homologization, the result of which is seen in 

 the accompanying figure 17, cannot be taken as quite certain, although there is a rather great 

 probability that it is correct. If this homologization is used, these bristles are developed as 

 follows: Three b-bristles, two of which are of the same type as the longest a-bristle, one almost 

 as long as this bristle, the other somewhat shorter; the remaining b-bristle is only about a thii'd 

 or a half of the length of the shorter of the two former b-bristles, rather weak and weakly 

 pectinated. Three c-bristles, the two jiosterior of which are subequal and also of the same 

 type as the longest a-bristle, but not quite half the length of this bristle; the third, the anterior 

 one, is very short, almost reduced and only weakly pectinated. Three d-bristles, subequal and 

 of aljout the same type and lengtli as the shorter of the two long b-bristles. Pilosity: The inside 

 ol the first endite has some fine hairs, the outside oi the third endite has very close, line liaiis. 

 Tlie palp and the exopodite, on the othci- hand, are smooth. 



Fifth limb: — J* r o t o j) o d i t e: The first endite has eigiit powerful bristles 

 of moderate length. The piojjortion b(>tween these bristles is about what is shown in fig. 19 

 ol' ('. (Vargula) norvegica, but biistles nos. .3 and 5, counting from the anterior side of the limb, 



