Slndics nil iiiaiiiir Oslracoils 653 



there are five tube-bristles, not four, as is usually the case in this genus. The outer-anterior 

 bristle on the anterior process is somewhat shorter and weaker relatively than in my fig. 24 

 of C. symmetrica. The basale has no bristles. E n d o p o d i t e (see the accompanying fig. 12): 

 First joint: At about the middle of the anterior side there are four short-haired bristles, three 

 of which are about as long as or somewhat longer than the anterior side of this joint, the 

 remaining one, one of the most distal ones, is about half as long or somewhat more. The end 

 joint is comparatively short and wide, its ventral edge is in most cases not quite so long as the 

 width of the first endopodite joint distally (calculating from front to back), its dorsal edge is 

 about half as long as the ventral edge or rather slightly longer. 



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

 endite has in most cases short hairs. E n d o p o d i t e : Unlike most species of this genus, this is 

 furnished with nine bristles, as there are two tube-bristles, not, as usual, only one, dorsally of the 

 short claw; one of these two bristles is about as long as the short claw, the other somewhat shorter. 

 The three ventero-auterior bristles on this branch are of about the same type as has been described 

 for C. oblojiga. This branch has no spines. E x o p o d i t e : This agrees with the type that has 

 been indicated above for C. obtusata, but all the ventral bristles on the first joint have short hairs. 



Sixth limb: — Endopodite: One of the two bristles usually has short hairs. 

 Exopodite: First joint: At the middle of the ventral side there are two, rarely three, 

 bristles, one of which is relatively long (about as long as the height of this joint) and is furnished 

 with rather long secondary bristles, the other is rather short and in most cases bare or with 

 short hairs. Ventero-distally on this joint there are also two, rarely three, bristles, all rather 

 short and most frequently furnished with short hairs or bare. The dorso-lateral bristle on this 

 joint is relatively short and has short hairs, the dorso-distal one always seems to be absent. 



Penis: — This is of about the same type as in C. symmetrica, but is often of about 

 the same height along the greater part of its length and is somewhat obli{juely cut off distally; 

 cf. the accompanying fig. 13. At about the middle it is furnished with a series of about four 

 to six oblique transverse muscles, distally of which there are no muscles. It has a rather large 

 copulatory appendage, of about the type reproduced in the figure just mentioned. 



Furca: — Behind the claws there is an unpaired short-haired bristle of about the 

 same I'elative length as in my fig. 33 of C. symmetrica. 



Rod- shaped organ: — The shaft reaches to about the distal boundary of the 

 second or third joint of the first antenna; the capitulum is always of about the type reproduced 

 by G. W. MtiLLER. 1906 a, pi. XVII, fig. 29, cf. my fig. 4. 



Upper lip: — The posterior ventral edge is of a type uncommon in this genus; 

 cf. the accompanying fig. 15. Its combs are sometimes furnished with some weak spine-like 

 processes which decrease in strength medially, about the same as in the figure mentioned, some- 

 times with rather well-developed hairs. Between the combs there is a narrow, deep notch. 

 The paragnates are triangularly rounded; cf. fig. 14. 



Female: 



Shell: — Length: This varies within the same limits as in the male. Seen from the 

 side the shells of all the specimens investigated by me were of about the same type 



