studies on marine Oslracods 281 



Sixth limb: — The second exopodite joint is rather short, somewhat rounded and 

 furnished with ratlier numerous bristles. Its posterior distal bristles are not strikingly larger 

 than the others. 



Seventh limb: — This is furnished with rather numerous cleaning bristles, a 

 large number of which are placed very close together distally, the rest being scattered irregularly 

 along the distal part of the limb. With regard to the situation of these latter bristles it is to be 

 noted that more than one bristle is exceedingly seldom or perhaps never found on the same side 

 of the same joint. The end comb consists of a moderate number of moderately strong teeth, firstly 

 some rather long distal teeth more or less pointed distally, smooth except that they are furnished 

 at the middle on both sides with a small secondary spine, and decreasing somewhat in length 

 the more proximally they are situated, secondly somewhat shorter and broader proximal teeth, 

 transversally cut off distally. Dorsally close to the end comb the wall of the limb is somewhat 

 thickened and is furnished with a few wart-like chitinous processes. In addition it is slightly 

 concave here; the dorsal and ventral walls of the cavity are not moveably joined to each other, 

 but can, all the same, be pressed against each other like a jaw to some extent; when this happens, 

 the distal teeth of the end comb are pressed in towards the dorsal wall of the cavity. The 

 compression is carried out by a short, powerful, paired muscle, issuing proximally somewhat 

 proximo-dorsally of the point of the limb and fixed distally to the bottom of the cavity. 



F u r c a: — The lameUae are rather short. The number of claws is about nine, without 

 any clear division into main claws and secondary claws. 



Upper lip: — This has only one large, rounded and quite undivided glandular 

 field, directed forwards (corresponding to the unpaired dorsal glandular field in closely-related 

 forms?). Ventrally of this there are on both sides some low pegs with glandular openings 

 (corresponding to the two paired lower-posterior glandular fields in closely-related forms?). The 

 ventral side is quite without glandular openings. 



The r o d - s h a p e d organ is comparatively small. 



The lateral eyes are well developed. 



Remark: — It is certain that not more than one species of this sub-genus has been de- 

 scribed in the literature, namely the one dealt with below, which is thus to be characterized as 

 the type-species. 



C. (Macrocypridina) castanea G. S. Brady. 



Ci/pridina castanea, G. S. Brady, 1897, p. 88; pi. XVI, figs. 1 — -t. 



G. W. MUller, 1906a, p. 130; pi. Y, figs. 1, ^; pl- XXXIII, 



figs. 11—16; pl. XXXIV, fig. 10-13. 

 „ „ „ 1906b, p. 13. 



?„ obesa, V. Vavra, 1906, p. 67; ph VII, figs. 132b— 142. 



castanea, G. H. FOWLEU, 1909, pp. 279, 296; pl. 26, figs. 279—281. 

 G. W. MULLER, 1912, p. 14. 



Zoolog. bjdrag, Uppsala. Suppl.-Bd. I. "^ 



