Sluclics 1111 niaiiiii:' Osiracoils 205 



filaments on the distal bristles are (Mther bare or furnished with some few short, weak secondarv 

 spinas. Pilosity: The whole antenna is hairless or at any rate has only extremely sparse and verv 

 short hairs. 



Second antenna: — P i' o t o p o d i t e: The medial-distal bristle is relatively 

 long, attaining to about the same length as that of tlie longest bristle in the proximal group 

 of bristles on the first joint of the endopodite (fig. 7). E x o p o d i t e: This is rather long; 

 yet it is comparatively somewhat shorter than the exopodite of other species of this sub-familv 

 that are dealt with in this treatise; by way of comparison the following figures may be given: 

 the length of the shell: the length of the exopodite is about 4 : 1 in this species, 3,5 : 1 in Cypridina 

 (Vargula) norvegica, 3 : 1 in 0. (V.) megalnps, and 3.3 : 1 in Cypridina ( Macrncypridina) castanca. 

 The proportion between the length of its first joint and the united length of all the following 

 joints is about 3:2; the second joint is about as long as the total length of the third and fourth 

 joints. The bristle of the second joint is about as long as the total length of the third to the 

 ninth joints or somewhat longer; distally it is bifurcated, cf. the adjoining figure 20. The 

 length of the longest natatory bristles: the length of the whole exopodite is about 5 : 3. The 

 end joint has four natatory bristles; the dorsal one, which is the shortest, is about the same 

 length as the whole of the e.xopodite. All the natatory bristles are fitted with well-developed 

 and rather broad natatory hairs along almost their whole length. The third to the ninth 

 joints have rather weak basal spines (these are, however, stronger than those reproduced for 

 Cypridina ( Macroci/pridina) castanea, fig. 11 of this species). The third to the eighth joints 

 are in most cases furnished laterally-distally with sparsely j^laced weak spines; medially-distally, 

 on the other hand, they have none of these. Endopodite (fig. 7): This is very long and 

 narrow; the second joint is about twice as long as the first and third joints. The first joint has 

 a group of four bristles proximally, one of which is rather long, about as long as the second 

 joint or somewhat shorter; the other three are subequal. not quite attaining to half the length 

 of the former; in addition on this joint, somewhat distally of this group of bristles, there is a single 

 bristle, about as long as or somewhat longer than the longest proximal one; all these bristles 

 are bare or have extremely fine short hairs. The second joint has a short bristle distally, 

 Va to Yj the length of the end joint. The bristle of the end joint is considerably longer than the 

 endopodite, in some specimens even extending somewhat behind the posterior boundary of 

 the protopodite. 



M audible: — The type is about the same as that shown in pi. II. fig. 7, Th. Scott, 

 1912 b. — Protopodite: The endite of the coxale is of about the same type as that 

 shown in pi. 1, fig. 20, G. W. MULLEli, 1895; it has very numerous spines, is weakly bifurcated 

 distally, the two distal points are somewhat more powerful than the spines and, unlike the latter, 

 armed with rather powerful secondarv spines; between the two distal points there is a low 

 process (cf. p. 182 above). The basale has ventrally three short a-bristles, .somewhat different 

 in length, furnished with short hairs or spines; in front of the most anterior of these bristles 

 there is an extremely short almost peg-like bristle; in front of this, with almost the same situation 

 and proportions as in Th. Scott's figure mentioned above, there are one b-bristle, two c- and 

 two d-bristles; the b-bristle was mi-ssing on one mandible in the specimen from M/S ,,A r m a u e r 



