studies on iiiariiu: Oslratods 329 



with these bristles in the male. Tiie sensory bristle of the fiitii joint is of about the same length 

 and type as in the male, but has fewer (six or seven) long, proximal sensory filaments. Of the 

 distal bristles the b-bristle, contrary to what is the case in all other forms of this sub-family 

 that are described in this work, is simple, without sensory filaments, of about the same type as 

 the d- and e-bristles; it is about as long as the anterior side of the fourth to the sixth joints. 

 The c- and f-bristles are subequal and about as long as the whole antenna (about 1,1 — 1,2 mm., 

 thus somewhat more than half the length of the shell; the former has eight, the latter nine 

 or ten filaments. The g-bristle is somewhat longer than the c- and f-bristles and has ten filaments. 

 The distal filament on the three last-mentioned bristles is very short, the others are all of the 

 same type, most of them rather long, furnished with up to three weak spines. The two 

 simple sensory bristles d and e are somewhat longer than in the male. The jjilosity is similar 

 to that of the male. 



Second antenna: — ^ The p r o t o p o d i t e, like the e x o p o d i t e, is some- 

 what more weakly developed than in the male; apart from this the two sexes show a very close 

 resemblance with regard to this limb. The proportion between the joints of the e x o p o- 

 d i t e, measured on the same scale as in the male, (cf. above) was as follows (the length of the 

 specimen measured was 1,65 mm.): 



I : II : III : IV : V : VI : VII : VIII : IX -= 21 : 7 : 4 : :5 : 3 : .3 : 2 : 2 : 1. 



From these figures it will be seen that the jjroportion between the joints is about the same in 

 both sexes, but that, as has been mentioned above, the exopodite is, on the whole, somewhat 

 weaker in the female. 



Mandible: — This shows an agreement in details with that of the male. All the 

 specimens investigated had on the posterior side of the second endopodite joint, distally 

 of the middle, two short bristles, one situated somewhat distally of the other, thus agreeing 

 with what we must regard as normal in the males. It may be specially mentioned that the 

 posterio-distal bristles of the joint in question are quite similar in both sexes. 



Maxilla: — This agrees with that of the male. It may, however, be noticed that 

 the powerful posterior bristle on the first endopodite joint, which is specially characterized 

 in the male by being bent almost at a right angle somewhat distally of the middle, is only weakl}' 

 bent in the female; it is also relatively somewhat shorter and has moderately strong pectination 

 distally. 



Fifth limb: — Quite like that of the male. 



Sixth limb: — Very like that of the male. It differs by the e p i jj o d i a 1 

 appendage of the i^rotopodite being represented by four short bristles. The second e x o- 

 p o d i t e joint has seven or eight bristles ventrally, of which the four or five anterior ones are 

 furnished with long, stiff secondary bristles, in most cases arranged in two very distinct wreaths. 



Seventh limb: — This is quite similar to that of the male. 



F u r c a: — This is of the same shape as in the type species. All the claws have secon- 

 dary teeth; the proximal teeth on claws nos. 4 to 8, unlike these in the male, do not dift'er 

 strikingly from the distal teeth b}- their size and strength. 



Zoolog. biUrag, Uppsala. buppl.-Bd. I. 42 



