282 
K. STEPHENSEN. 
as indicating that the specimen in question could not be 9 of the same 
species as the g above described; in order to make certain therefore, 
S 
Fig. 22. Pseu- 
dalibrotus 
littoralis 3, 
Up. 3(Dan- 
mark-Exped. 
St. 17). 
I investigated this feature in the case of P. littoralis, the 
only species of which I had access to both male and 
female. As will be seen from my figure (fig. 22), the urop. 
3 of P. littoralis ¢ has setae both on the outer and the 
inner ramus, whereas in the 9, these are only found on 
the outer (I disregard the 3 separate setae on the inner 
ramus; vide Sars, Account, vol. 1, Pl. 35). The 3 above 
described having only a few such setae, it would seem that 
the fact of none such being found in the @ here in 
question, need not count against the probability of both 
belonging to one and the same species. The telson in un- 
usually broad. 
St. 118, specimen Nr. 3 (Fig. 23). Young 9, 14mm. 
With regard to determination of this and the following 
two specimens, I am far more doubtful than in the case 
of the two foregoing. I am most inclined to consider it 
as a very young ? of P. Nanseni. The small marsupial plates shown 
for pd lack setae at the edge. The cephalon resembles entirely that 
a 7-3 
7*U; 
Fig. 23. Pseudalibrotus Nanseni Nr. 3 (young Q). 
of the 9 above described. Postero-lateral corners of the 3. epimeral 
plate of the same shape as in the 3 above mentioned (fig. 19). The 
antennae are short; in ant. 1, the accessory flagellum has only 
1 joint, and the flagellum only 19; in ant. 2, the flagellum has 26. 
