(i()4 TACxE SKOGSBERG 



or less long, soft hairs. The remaining four bristles on these two joints are moderately long, 

 subeqiial and differentiated as thin-walled, rather narrow or moderately wide, bare sensorial 

 filaments, more or less rounded distally. (About the same as in fig. 10 of C. symmetrica. If 

 nothing special is mentioned in the following descriptions of species, these bristles are of the tvpe 

 reproduced for the species just mentioned.) 



Second antenna: — 



Male: — Protopodite: — This seems to be subject to very slight variation 

 in this genus. In all the species investigated by me it was characterized by two processes, 

 both situated near the exopodite, one laterally, the other medially. The lateral one of these 

 processes is small, verruciform, and in most cases of about the same type and position as in the 

 adjoining fig. 11 of C. symmetrica. The medial one is considerably larger, in most cases more 

 (u- less irregularly globular. It is most frequently of the same type and position as in the 

 adjoining fig. 13 of C. symmetrica', only in exceptional cases has this process another type. 

 (Only in the latter case is this character specially mentioned in the following descriptions of 

 species.) Exopodite: The first joint is in most cases of about equal thickness throughout 

 its whole length, only in exceptional cases — and then this is specially mentioned in the following 

 descriptions of species — of another type. The eighth joint is most frequently very short, 

 sometimes even difficult to distinguish. The ventero-distal bristle of the first joint is hyaline, 

 bare, in most cases bent vermiformly, narrow, of about the same width throughout its length, 

 and about as long as the total length of the three following joints. The natatory bristles on the 

 second to the eighth joints are all about the same length — the distal ones are only slightly shorter 

 than the proximal ones. The distal part of these bristles — about a fifth to a seventh of the 

 whole — ■ is bare, hyaline and extended like a lancet (about the same as in pi. 5, 

 fig. 9, G. W. MtJLLER, 1894). The proximal part of these bristles has rather long natatory hairs 

 almost down to the base. The end joint has three bristles. The relative lengths of these are 

 subject to rather slight variation in the species of this genus that are described below. The 

 ventral one is usually about as long as the exopodite and of about the same type as the natatory 

 bristles on the preceding joints, but is furnished with somewhat fewer natatory hairs and is 

 not lancet-shaped distally, though it is hyaline and bare. The two dorsal ones are rather 

 narrow, of about equal thickness throughout their length and in most cases hyaline and 

 bare; only in exceptional cases do these two bristles have short hairs. One of them is about 

 as long as the total length of the five or six distal joints, the other is about twice as long; cf. the 

 accompanying fig. 12 of C. symmetrica. Endopodite: First "joint: This is moderately 

 large and somewhat irregular in shape. It is about as long as it is broad ; it is somewhat irregularly 

 rounded posteriorly, its anterior side has two processes; one of these, the processus mammillaris, 

 situated at about the middle of the anterior side, is moderately large or rather small, more 

 or less conical, the other, situated somewhat distally of the former one, is somewhat larger, 

 and is verruciformly rounded. This joint was of about the type reproduced in the adjoining 

 figs. 13 and 14 of C. symmetrica in almost all the species of this genus described by me below; 

 only in those cases where it is specially mentioned below was there any deviation from this type; 

 it is, however, to be noted that the little verruciform appendage situated distally on the processus 



