8 G. 0. Sårs. 



the exopodite, except in the 1st pair (fig. 8), is much 

 larger and oblong oval in form. The terminal lobe of the 

 endopodite is evenly rounded, and in none of the pairs 

 exhibits any denticles or projections at the inner corner 

 The differences of the 1st and last pairs (figs. 8, 10) from 

 the other pairs (fig. 9) are quite analogous to those found 

 in S. gracilis. 



The marsupial pouch (see fig. 1) is very slender, cylindric, 

 and extends almost as far as the last caudal segment. The 

 terminal lips are bent in a very peculiar manner, the dorsal 

 one forming almost a right angle to the axis of the pouch, 

 and looking like a sharp recurved beak (see also fig. 4). 

 In none of the specimens did the pouch contain any eggs, 

 and the glutinous gland did not seem to be continued within 

 the pouch itself. 



The sexual appendages of the male (see fig. 2) have 

 the form of 2 comparatively small cylindric tubes scarcely 

 extending beyond the 1st caudal segment. In one of the 

 specimens, however, the right appendage was about twice 

 as long as the left, with its outer part curled up in nearly 

 a complete ring; and this terminal part exhibited a very 

 peculiar structure, being clothed on one side with several 

 rows of recurved spikes. On a close examination it was 

 proved, that this spinulous part was nothing but the evagi- 

 nated spermatic duct, which, on the left appendage lay 

 inside the tube. 



The caudal rami are somewhat different in the two 

 sexes. In the female (see fig. 13) they are of quite normal 

 appearance, forming 2 slightly diverging, narrow lanceolate 

 blades, of about half the length of the tail, and fringed all 

 round with densely ciliated setæ. In the male they are 

 somewhat more elongated and almost linear (see fig. 12), 



