studies on marine Ostracods 743 



same proportions. Pilosity: On the anterior side of the first joint of the endopodite there are 

 exceedingly short hairs more or less abundantly. Otherwise this branch is bare. 



Mandible (fig. 20) : — Protopodite: Coxale: The toothed edge of the pars 

 incisiva has twelve or thirteen moderately large, simple, smooth, triangular teeth, of which 

 the two anterior ones are rather considerably larger than the others (fig. 15). The distal tooth-list, 

 which is only slightly narrower than the toothed edge of the pars incisiva, is furnished with 

 twelve to fourteen teeth. Of these the two posterior ones are very large, tusk-like and smooth; 

 of the others, all of which are simple, smooth, triangular and moderately large, the most anterior 

 one is often the largest (fig. 16). The proximal tooth-list is very narrow, being only about a third of 

 the width of the distal tooth-list, and is attached at or somewhat behind the middle of this; 

 it consists of from five to eight moderately large or small, smooth teeth, usually decreasing 

 in size the more anteriorly they are situated; they vary somewhat in type; cf. figs. 14,16,17. 

 (It does not seem impossible that the larger of the two posterior teeth on the distal tooth-list 

 actually belongs to the proximal tooth-list; cf. figs. 14 and 16.) The masticatory pad is very 

 large, about as wide as or rather slightly narrower than the distal tooth-list, simple, and (when 

 it is pressed beneath the coverglass) cut off distally about parallel to the toothed edge of the 

 pars incisiva and armed with very close, short, fine spines. Somewhat proximally of the masti- 

 catory pad there is a large oval cavity with a sharp, raised edge. This cavity is situated longi- 

 tudinally on and somewhat in front of the middle of the pars incisiva; it is about as long as the 

 width of the masticatory pad, is smooth inside and is furnished posteriorly on the outside with 

 close, short,- fine spines; near the edge of the cavity there are also rather numerous moderately 

 long, fine spines. In addition this cavity has on the inside of the posterior edge a dense row 

 of eight to ten smooth, usually simple, lancet-bristles of moderate size (see p. 583 above, 

 under the special terminology for the genus Halocypris); these lancet-bristles can be opened 

 out like a fan (see fig. 18 and G. W. MUller, 1890 a, pi. XXVIII, fig. 10); when pressed together 

 they go down into the cavity (see fig. 14). Basale: The six teeth on the distal edge of the endite 

 are all of about the same width; most of them are furnished with comparatively strong secondary 

 teeth; the anterior one or the two anterior ones of these teeth are rather low, with little or even 

 no difference between the main point and the secondary teeth. The anterior one of the two 

 processes situated posteriorly on this edge is a very short and bare tube-bristle; the posterior 

 one is dagger-shaped and furnished in most cases with more or less powerful secondary teeth. 

 The single tooth on the outside of this endite is situated proximally of distal teeth nos. 2 and 3 

 (counting from in front), is of about the same size and strength as the distal teeth and is in most 

 cases serrated on the anterior edge. The bristle on the anterior edge of this endite is about as long 

 as the distal edge of the endite. The three other bristles on this process are about two or three 

 times as long as the bristle just mentioned and are situated somewhat proximally of and behind it. 

 All these four bristles have short, fine hairs, almost bare. Apart from these this joint has no 

 bristles. The e p i p o d i a 1 a p p e n d a g e is represented by a very long bristle*, which 

 is about as long as the anterior side of the two proximal endopodite joints and has sparse, long 



* Or else it is qnilo absent. In lliis case tin; bristle mentioned above as the remains of the eijipodial appendage 

 corresponds to the bristle that is sitnated distally on the inside of the basale in Halocypris and Convhuccia. 



