St\idies on marine Ostracods bl-^ 



Seventh limb: — The longest bristle is about a third or a quarter of the length 

 of the shell, but varies to some extent even within the species. This limb is in most cases 

 smooth; in exceptional cases the end joint is furnished with spines.' 



The penis varies rather considerably in type. Disto-laterally on the penis, somewhat 

 ventrally of half the height of the organ and i ust proximally of the distal, forward bending part 

 of the vas deferens, there is in most cases a lamelliform copulatory appendage, which is differently 

 developed in different species. 



F u r c a: — This has eight claws. The armature of the claws is in most cases moderately 

 strong. Between the first and second claw there is no verruciform process. Behind the claws 

 there is sometimes an unpaired bristle which varies somewhat in length. The lamellae are in 

 most cases furnished v/ith groups of short and stifi hairs on the inside. 



Rod-shaped organ: — This shows more or less marked dimorphism. 



Male: — This is always large, in most cases longer than the first antenna (the latter, 

 of course, measured without its bristles). It consists of three parts which are moveably joined to each 

 other. The middle one of these is rather firmly joined to the first antenna by means of the dorsal 

 bristle on the second joint of this limb (retinaculum). The two proximal joints, between which 

 the boundary runs at about the boundary between the two proximal joints of the first antenna, 

 point forward, and are of about the same thickness throughout their length. The distal part, which 

 is always somewhat thicker than the two proximal parts, points in most cases more or less ventrally ; 

 in addition it is in most cases armed with spines, principally along the ventral (posterior) side. 



Female: — This organ is developed very differently in the female; in most cases 

 it is somewhat shorter than in the male. Division into joints is most frequently less distinct 

 than in the male. The boundary between the first and second joints is sometimes indicated, 

 but in most cases it is quite absent. The distal part is most frequently somewhat thicker than 

 the proximal part and in most cases, as in the male, it is armed with spines. The organ is not 

 joined to the first antenna by a retinaculum, but is quite free. 



Upper lip: — This projects strongly; when seen from the side it forms in most 

 cases a rather pointed angle anteriorly (see my fig. 36 of C. symmetrica); its anterior side has 

 no verruciform swellings. The glands of the upper lip have their exits scattered on the ventral 

 side of the upper lip, arranged on the whole, however, in two longitudinal rows running on each side 

 of and at some distance from the middle line. The postero-ventral margin of this lip varies some- 

 what in shape, but it is as a rule somewhat more rounded than in the genus Halocypris; its 

 combs project moderately and are furnished with rather numerous and rather powerful hairs. 

 In the inner corner of each of these combs one or two glands have their exits. The part between 

 these combs is most frequently somewhat narrower than each of the combs, but otherwise it 

 varies in shape, being sometimes more or less straight and sometimes having a more or less deep 

 notch at the middle. 



The p a r a g n a t e s are in most cases more or less oval (cf. my fig. 38 of C. symmelrica) 

 or else somewhat more triangular (cf. my fig. 14 of C. rotumlata); they often vary, however, 

 even within the species. The c h i t i n o u s lists behind the imder lip are of the type 

 reproduced by G. W. Mi'llbu, 1894, ])1. 35. fig. 15; ci. my fig. 35 of C. symmetrica. 



