470 G. STBWAEDSON BRADY. 



of growth, and in the greater number of feet, which in 

 Eulimnadia number eighteen pairs. In the shape of the 

 shell, however, the present species departs conspicuously 

 from the type, to which in other respects it seems to 

 conform closely. 



Several specimens were collected in the neighbourhood of 

 the Victoria Falls — all of them females. 



Genus Streptocephalus Baird. 



Streptocephalus propinquus sj). nov. PI. XXXVIII, 



figs. 2-6. 



Female (fig. 5). — Length to the end of the caudal rami 

 about 8'5 mm., the posterior (tail) division of the body rather 

 longer than the anterior. Head rounded in front and bearing 

 the antennules, antennae, a pair of deeply coloured eyes and an 

 inconspicuous central ocellus. Behind the head is a cervical 

 region containing the mouth-organs, mandibular hump, and 

 behind these the shell-glands. Following these are eleven 

 segments of the mesosome, each bearing a pair of branchial 

 legs. The genital region consists of two imperfectly separated 

 segments, from which arise the two ovigerous pouches. The 

 tail consists of seven well-defined segments, and ends in two 

 stout caudal prolongations which are plumosely fringed with 

 stout setae. 



The antennules (fig. 6 h) are simple, very slender and 

 inarticulate; the antennae (fig. 6c) are simple, foliaceous and 

 finely hispid ; the ocellus (fig. 6 a) is small, faintly rubescent ; 

 the eyes (fig. 6 d) are very large, clavate in outline, composed 

 of numerous small lenses, jet-black at their circumference and 

 covered with a transparent, hyaline cornea ; the mandibular 

 hump forms a conspicuous bulbous prominence just behind 

 the eye (fig. 6 e), and behind this, again, is the sphenoidal 

 shell-gland (fig. 6/). The first and last pairs of feet are 

 somewhat smaller and of rather different structure from the 

 rest; the marsupial pouch is about as long as two conjoined 

 tail-segments and is slightly bifid at the apex. 



