;ns ta(;k sKocsiiiomi 



aiitiMinr (uifs ami have Umis.. soft hairs, cillicr. as in tin" case of fliose sitiiati'd farthest back, 

 riirld out to tlieir points, or else oiil\ almi^ the iiii'atci' part ol tlicii- Ic'iij^ili; in the liist- 

 montiuiu'd case tliov have short hairs distally. Most or all tlic anterior liristles have, long, stiff 

 sec'omlary bristles at the middle and are moderately stroniiiy or linely pectinated distally. 

 The transition from the anterior to the posterior type of bristle is gradual. 



Seventh limb: — This shows weak se.vuul dimorphism {(}. W. Mtll.LKU states^ 

 I'.ilL'. p. '2i>. that this limb is similar in lioth sexes). 



Female: — The rnunbcr of cleaniiii; l)ristles varies somewhat, from eight to over 

 forty were observeil. Some of these are situated close together distally, the others are placed 

 irregularly along the distal part of the limb; with regard to the j)osition of the latter it is to bo 

 ni>tod that it is only exceedingly seldom that there is more than one bristle on the same side 

 of the same joint. The end comb consists of a rather slight or a moderate number of teeth (from 

 about seven to nearly twenty), which, unlike in most forms of the sub-family Cypridininae, 

 cannot be divided into proximal and distal teeth. Dorsally near the end coml) the wall of tlu; 

 limb becomes somewhat thicker and is furnisiied with a varying number of chitinous jjcgs; in 

 addition the wall is somewhat concave here, the depth of the concavity varying. The dorsal 

 and ventral walls of the concavity are not moveably joined to each other, nor is there any special 

 adductor such as is found in many of the forms belonging to the sub-family Cypridininae. 

 \Miether, in spite of this, the end comb can be pressed in towards the dorsal edge of the concavity 

 I have not been able to decide, as I have had only preserved material of these forms at my 

 disposal. I wish merely to state here that among the material investigated by me I never found 

 any specimen with its end comb pressed inwards, although I had very abundant material. 



Male: — Differs from that of the female especially by the cleaning bristles having 

 a somewhat, though only very slightly, smaller number of bells and by a slight reduction of 

 the end comb. 



Penis: — This is small, but has a rather well-developed muscular system. Distally 

 it is divided into two rather short, ciuved processes, both having a few bristles distally (= the 

 exopodite and endopodite of an original biramous limb?). It is rather weakly chitinized and 

 has no strongly thickened lists. 



Furca: — This has weak (or is sometimes cjuite without?) sexual dimorphism. 

 G. W. MCller states, 1912, p. 25, that in this genus this organ is quite alike in males and females. 



Female: — The lamellae seem to be subject to rather slight variation with regard 

 to type; they are moderately elongated. From six to fifteen, in most cases from nine to twelve, 

 furcal claws have been observed; the number of claws seems to be subject to some, though 

 only a rather shght, variation in several species of this genus. In a number of species main 

 claws and secondary claws can be distinguished, in others a division of this kind cannot be 

 carried out; all the claws are weU defined from the lamella. On aU the species of this genus that 

 were investigated by me the equipment of the claws is about as follows: The first claw has two 

 rows of smooth secondary teeth; the inner row, which is displaced somewhat dorsaUy, consists 

 for the most part of powerful teeth pointing distally, the teeth in the outer row are either 

 , powerful or there is an irregular alternation between powerful and weak ones — in this respect 



