2 in TAGE SKOGSBERG 



of the distal part of these bristles does not, liowever, justify the assumption of an adajitation 

 for sensory function. The distal chitinous process of the protopodite is rather powerful, bent 

 and of moderate length. The exopodite is fiye-jointed. The first joint (fig. 13): The 

 main tooth has seven constituent teeth all well defined isroximally; the secondary teeth on the 

 latter appear about as in the adjoining figure, alternately powerful and very weak, sometimes, 

 however, several weak ones between two strong ones. The bristle close to the main tooth, on 

 the posterior side of the joint, is about as long as the longest constituent tooth of the former, 

 moderately strong and with long, stiff secondary bristles in the middle, almost bare distally. 

 On the anterior side of this joint close to the main tooth there is a series of six bristles; the two 

 situated closest to the main tooth are subequal, rather long and strong, the rest decrease fairly 

 uniformly and rapidly in length and strength the farther they are situated from the main tooth ; 

 the shortest one is only about a quarter of the length of the two longest. They all have long, stiff 

 secondary bristles in the middle; these secondary bristles become, however, fewer as the bristles 

 become shorter. The bristle situated nearest to the main tooth is rather strongly pectinated 

 distally; the distal equipment decreases on the others as the length of the bristles decreases, 

 the shortest ones being almost bare distally. A little way in front of these bristles on the 

 anterior side of this joint there is a single bristle of about the same type and length as bristle 

 no. 3 among the last-mentioned six bristles, counting from the main tooth; in one case among 

 the specimens from S/S ,,M i c h a e 1 S a r s" two such bristles were observed at this place. 

 The second joint (fig. 18): This has five, in exceptional cases six, a-bristles, nine b-bristles, 

 one c- and one d-bristle. The a- and b-bristles are rather powerful, with numerous rather strong 

 secondary teeth. The c- and d-bristles are of moderate length, with long, stiff secondary bristles 

 in the middle, distally almost bare or with short hairs. Third joint: The inner process is small 

 and has three bristles, two moderately long and subequal distal ones, with short hairs or almost 

 bare, and a proximal-posterior one which is short and has most frequently long secondary bristles 

 in the middle and short hairs or else is quite bare distally. The outer process of this joint is 

 somewhat greater than the inner one and has two moderately long, subequal, rather powerful 

 distal bristles, both of them with long secondary bristles in the middle and with short hairs or 

 almost bare distally. The fourth exopodite joint is rather large. Distally it has ten to thir- 

 teen moderately long and powerful bristles somewhat different in length from each other, 

 arranged in two parallel rows; in the posterior row there are four or five bristles somewhat 

 shorter, on the average, than- those in the anterior one, with short and rather powerful secondary 

 bristles; in the anterior row there are five to eight bristles; most frequently all of them are almost 

 bare, except the outer one, which in most cases has long, stiff secondary bristles in the middle. 

 The end joint is small but well defined, and is moved by a special muscle. It has two subequal 

 bristles, whose type and length is about the same as the two bristles on the outer process of the 

 third exopodite joint. Pilosity: The outer process of the third joint of the exopodite and the 

 fourth and fifth joint of this branch are partly furnished with fine hairs. 



