Studies on marine Oslracods (i21 



E n (I o p o d i t e: The first joint has three posterior bristles, al! with short hairs. The lateral 

 one of these bristles is about as long as or somewhat longer or shorter than the two distal endo- 

 podite joints, the two others are somewhat shorter. 



Maxilla: — P r o t o p o d i t e: The bristle on the basale is relatively short, only 

 about hull' as long as the first endopodite joint; in exceptional cases it has at the middle a few 

 rather long secondary bristles. E n d o p o d i t e: A couple of the six bristles on the anterior 

 edge of the first joint are usually furnished with rather long, stiff secondary bristles at the middle. 

 On the posterior edge of this joint there are two or three bristles, in most cases three. The 

 ventral side of the end joint is about as long as the breadth of the first endopodite joint distallv 

 (calculated from front to back); its dorsal side is about half as long. 



Fifth limb: — P r o t o p o d i t e: The longer of the two tube-bristles on the second 

 endite is always furnished at the middle with rather long, stiff secondary bristles. E n d o p o d i t e : 

 One of the three ventero-anterior bristles is of about the same length and type as the long bristles 

 on the endites of the protopodite, the two others are somewhat shorter and weaker (about the 

 same proportions as in my fig. 27 of C. symmetrica) and have short hairs. This branch has no 

 spine armature. Exopod ite: First joint: This has two medio-ventral bristles, often sub- 

 equal and about as long as the proximal height of this joint, and with short hairs. There are 

 three or four bristles in the proximo-ventral group; these are somewhat different in length, 

 the longest being in most cases about as long as or somewhat longer than the two medio-ventral 

 bristles, the shortest about half as long; the longest of these bristles has in most cases rather 

 long hairs at the middle, the others most frequently have short hairs. The disto- 

 ventral group of bristles consists of two or three short-haired bristles of somewhat different 

 lengths; their lengths vary in most cases within the same limits as in the case of the bristles 

 in the proximo-ventral group. The dorso-lateral bristle is furnished with long liairs. 

 Pilosity: The protopodite and the first exopodite joint have sparse haiis medially, but apart 

 from these this limb always seems to be bare. 



Sixth limb: — Exopodite: The ventral bristles on the first joint are perhaps 

 on the average somewiiat shorter than in my fig. 29 of C. symmetrica; they all have rather long 

 hairs at the middle as is the case with tlie dorso-lateral bristles on this joint. The ventral bristle 

 on the end joint has short hairs. 



Penis: ~ This is comparatively narrow and has about the same height throughout its 

 length ; it is obliquely rounded off distally : cf. pi. IX, fig. 13, C. Claus, 1891 a. At about the middle 

 there is a series of about five or six oblique transverse nmscles; there are no muscles distallv of 

 these. It has a rather large, distally rounded, copulatory appendage; cf. the adjoining fig. 8. 



Furca: — The fifth claw is imusually decidedly bent; see pi. IX, fig. 2, C. Claus, 

 1891 a and my fig. 9. There is no unpaired bristle behind the claws. 



Rod -shaped organ: — The shaft reaches to about the proximal boundarv 

 of the third joint of the first antenna or to the point of this limb. The capituUun is about as 

 long as the second joint of the first antenna; in the specimens investigated by me this part was 

 of about the type reproduced in the accompanying fig. 10, i. e. of about the same type as was 

 found by C. Cl.AliS. 



