studies on marine Ostracods V'*! 



cases subequal, about as long as the proximal height of this joint; both have short hairs or else 

 one of them has rather long secondary bristles. The proximo-ventral group of bristles has 

 three or four bristles, which vary in length, the longest being sometimes about as long as or 

 even somewhat longer than the medio- ventral bristles, the shortest about half as long; they are 

 all often furnished with short hairs, sometimes one of them has rather long secondary bristles. 

 The distal-ventral group of bristles consists of two or three bristles, in most cases with short 

 hairs; the length of these bristles most frequently varies within the same limits as in the case 

 of the bristles in the proximo-ventral group. The dorso-lateral bristle is relatively short, often 

 only about as long as the height of this joint, and is furnished with long hairs. End 

 joint: The dorsal claw is about a third shorter than the middle claw or even somewhat shorter. 

 Pilosity: The protopodite and the first exopodite joints are sometimes furnished with sparse 

 hairs, but in most cases they are bare. 



Sixth limb: — The endopodite most frequently has only one bristle, but 

 I discovered two at least in one case; in this case, however, one was rather short. Exopodite: 

 The first joint is in most cases quite without bristles; in one case a very short dorso-distal 

 bristle was observed. The bristle on the second joint is exceedingly short, verruciform, scarcely 

 perceptible with Reichert's ocular 4, Leitz's immersion Vi,. The dorsal bristle on the third 

 joint is of the usual size and type, the ventral one is like that on the preceding joint. 



Penis: — This is of about the ty^e reproduced by G. \Y. MOlleh, 1894, pi. 6, fig. 13; 

 cf. the accompanying fig. 7. At about the middle it is furnished with a series of from four to 

 eight oblique transverse muscles (the more numerous these are the narrower they are), distally 

 of which there are no muscles. It has a rather large copulatory appendage of varying shape; 

 cf. the accompanying figs. 7 and 8. 



Furca: — There is no unpaired bristle behind the claws. 



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

 of the third joint of the first antenna or to the point of this limb. The capitulum (cf. the accom- 

 panying fig. 4) is in most cases somewhat shorter than the second joint of the first antenna and 

 is of the type described and reproduced by G. W. Mi'LLER. 



Upper lip: — The part between the combs on the posterior ventral edge of this 

 lip is almost straight or rather weakly concave; it is sometimes of the same type as in my fig. 37 

 of C. symmetrica, sometimes more notched in the middle. The p a r a g n a t e s are about 

 the same as in the species just mentioned. 



Female: — 



Shell: — Length: The specimens investigated by me measured 1,1 — 1,15 mm.; 

 cf. below. Length : height about 2,1 : 1; length : breadth about 2,5 : 1. Seen from 

 the side (see the accompanying fig. 3) it is of about the type reproduced by C. Cl.\US and 

 G. W. MOller. Seen from below it is of about the same type as that of the male, 

 but, as is seen from the figures given above, it is relatively narrower. Seen f r o m inside: 

 The selvage on the rostrum has a smooth edge or is rather finely and irregularly serrate and is 

 furnished with a spine as in pi. 37, fig. 11. G. W. .MCM.ER, 1804. In other respects it 

 resembles that of the male. 



