studies on marine Ostracods 605 



inammillaris that is drawn in these figures is only seldom developed. Of the two bristles on this 

 joint, both of which are attached distally on the antero-distal process of the joint, the distal 

 one, the b-bristle, is in most cases of about the same length as the proximal breadth of this 

 process, the proximal one somewhat shorter; cf. figs. 13 and 14 of C. symmetrica; only in 

 exceptional cases — which are specially mentioned in the descriptions of species — are there 

 deviations from this rule. The second joint is rather short, but rather powerful; it is most 

 often of about the same shape as in my figs. 13 and 14 of C. symmetrica (only exceptions are 

 noted in the descriptions of species). It is most, frequently armed with five bristles. Of these the 

 c- and d-bristles are rather short and weak, pointed and of the ordinary type, the f- and g-bristles, 

 on the other hand, are comparatively long, the g-bristle is in most cases longer than the f-bristle; 

 they are rather powerful proximally, hyaline distally and obviously function as sensory organs. 

 Besides these four bristles there is, as has been mentioned, an additional bristle, the e-bristle; 

 this, which is situated somewhat distally of the c- and d-bristles at the base of the f-bristle, 

 is always more or less short, pointed and of the ordinary type. The end joint varies very much 

 in type. The three bristles on this joint, the h-, i- and j-bristles, are subequal, always shorter 

 than the f- and g-bristles and developed as hyaline, thin-walled (only exceptionally, as in the 

 case of C. Giesbrechti, partly thick-walled) sensorial filaments, attached a short distance distally 

 of the proximal boundary of this joint. The first endopodite joint always seems in this genus 

 to be furnished with exceedingly close short, fine spines on a rather large part of its surface. 



Female: — The p r o t o p o d i t e is like that of the male except for the fact that 

 it has no disto-medial verruciform process. The endopodite has two or three joints. 

 The first joint is about the same as that of the male. The original second joint is weaker than 

 that of the male and more or less cylindrical. The third joint is extremely small in those cases 

 when it is developed at all.* The bristles of the first joint are about the same as in the male. 

 Of the bristles on the original second joint only two are developed in most cases, namely the 

 f- and g-bristles; the c-, d- and e-bristles are almost always quite absent (only when one or 

 more of these bristles are developed is it stated in the following descriptions of species); the 

 f- and g-bristles are developed in about the same way as in the male. On the little end joint 

 the h-, i- and j- bristles are always developed and in most cases they are of about the 

 same type as in the male. Between tlic h- and i- bristles there is also in a number of 

 species a short, peg-like process or a short bristle. (For the morphological value of this bristle 

 see p. 584 above, the remark on the genus Halocypris.) The first endopodite joint is, as in the 

 case of the male, furnished with short and fine spines. 



Mandible: — This limb seems to be subject to rather slight variation in this genus. 

 In most of the species investigated by me I found — apart, of course, from small individual varia- 

 tions — quite the same type as far as most characters were concerned. In some species, however, 

 more or less deviating types were observed; in this case it was not always the same character 

 that varied, but sometimes one. sometimes another. Under these circumstances it seemed to 



* All llie previous writers slate tiial this Ijrancli is always Iwo-joinlod. G. \V. MuLi.Eit, however, has observed 

 that tliree joints arc sonielimes developed: ef. G. W. Millkr, I'JOr. a. p. W. Me has. however, ohvinusly forgotten this 

 farl in working out the genus iliagnosis. 



