30 G- 0- Sårs. 



female. A similar papilla is also found in Brauer's species, 

 and is by that author regarded as homologous with the 

 frontal lobe in the male of Streptocephalus, a supposition 

 which, however, is quite inadmissible, since it occupies a 

 very different place. 



The branchial legs (figs. 5 — 7) are on the whole con- 

 structed upon the very same type as in Streptocephalus, 

 though, on a closer comparison, some well-marked differences 

 may be found to exist. Thus, the basal plate in all the 

 pairs has the edge divided into coarse serratious; the epi- 

 podite is comparatively larger; and the terminal lobe of 

 the endopodite in all the pairs from the 2nd to the 8th has 

 the inner corner produced to a blunt, tooth-like projection,, 

 exhibiting, moreover, at some distance above it another 

 similar, but much smaller projection (see fig. 6). The 1st 

 and last pairs (figs. 5, 7) exhibit differences from the middle 

 pairs analogous to those found in Streptocephalus. 



The marsupium in the female (fig. 1), as above stated, 

 forms a very large and capacious sac-like expansion of the 

 genital region. Its form is broadly ovate, with the posterior 

 extremity but very slightly prominent, and scarcely extending 

 beyond the limits of the genital region. The valvular orifice 

 is bordered by 2 short, evenly rounded lips. 



The sexual appendages in the male (fig. 2) exhibit an 

 appearance similar to that in the male Streptocephalus 

 gracilis. 



The caudal rami are very different in the two sexes. In 

 the female (fig. 1) they somewhat resemble those in Streptoce- 

 phalus gracilis, though they appear comparatively more elon- 

 gated, attaining almost half the length of the tail. In the male 

 these rami (see figs. 2' and 3) exhibit quite an extraordinary 

 development, and, when fully extended, even equal in length 



