studies oil maiiiie Ostracods 385 



sensorial filaments is quite the same as is shown in fig. 8 of Ph. (Ph.) Lilljehorgi. Pilosity: 

 The second joint has rather abundant transverse rows of short, stiff hairs. (This limb agrees 

 entirely with that of Ph. (Ph.) rotunda; cf. the figure 3 for this species). 



Second antenna: — Exopodite: The first joint is rather short, being only 

 about as long as the total length oi the following joints. The bristles on the second to the fifth 

 joints are about as long as the first joint or even as the total length of the three proximal 

 joints; they are bare and have a simple point distally. The proportion between the length of 

 the long natatory bristles and the exopodite is about eight to five. The end joint has seven 

 bristles, the three dorso-medial of which are short; of these three the longest one is about as 

 long as the first or the first three joints, the shortest is only about as long as the total length 

 of the three to the five distal joints; the shortest one often has short hairs, the two others are 

 usually equipped with rather sparse long natatory hairs. In females with their embryos far 

 developed the long natatory bristles are broken off; after this they are of about the same 

 length as the bristles on the second to the fifth joints or are even still shorter. The second 

 to the eighth joints have rather short and weak basal spines, smallest on the proximal joints 

 and sometimes apparently even quite absent on the second joint. In most cases the basal spines 

 are simple; sometimes, however, they have two or three points. Sometimes one or more smaller 

 spines can be observed close to one or more of the basal spines; these small spines (presumably 

 like the basal spines) are obviously only strengthened separate hairs in the rows of hairs that 

 are found distally on these joints. E n d o p o d i t e: The first joint has six bristles, with short 

 hairs or almost bare, moderately long and strong; five of these are situated in one group, the 

 sixth is situated somewhat distally of the others. The second joint varies somewhat in shape, 

 but has in most cases the shape reproduced in fig. 12. Ventrally this joint has usually only one 

 bristle, situated somewhat proximally of the middle of the joint. This bristle is rather long, 

 but its length varies somewhat; it is furnished at the middle with several irregular wreaths of 

 long, stiff secondary bristles and has short, fine hairs distally. On one specimen this endopodite 

 had, both on the right and the left antenna, an additional bristle distally of the former one; this 

 bristle had the same type as the former one, but was not quite half as long as it. On another 

 specimen a bristle of this sort was observed on the antenna of one side, the one of the other side 

 having only a long one. Finally in one specimen this joint had ventrally two bristles of about 

 equal and moderate length; both of these had a few irregular wreaths of long, stiff secondary 

 bristles at the middle and short hairs distally. The distal bristle of this branch is about as long as 

 the second joint, sometimes, however, a little shorter, sometimes a little longer; distally it is finely 

 rounded. In one specimen, both on the right and the left antenna, a proximal protuberance 

 was observed on this bristle; this protuberance was of about the same type as that which 

 G. W. MULLER observed in Ph. (Ph.) levis (1894, pi. 3, fig. 31). 



Mandible: — Proto])()dite: The basalc has from six to eight moderately 

 long bristles ventrally, most of them subequal; one or more of those situated most distally are 

 slightly longer than the others. Dorsally this joint has, in addition to the two distal bristles, 

 two other bristles, one situated somewhat in front of the other just in front of the middle of 

 the joint. One of the distal bristles is about as long as the anterior side of the first endopodite 



Zoolog. bidrag, Uppsala. Sui>pl.-Bd. I. *" 



