270 DR. W. A. CUNNINGTON O^' 



lobes pointed and separated by fairly broad sinus one-half length 

 of abdomen. Abdomen in the female as long as or slightly 

 longer than broad, less than one-fourth entire length of body ; 

 posterior lobes obtusely pointed and separated by broad sinus 

 almost one-half length of abdomen. The f ureal appendages 

 in both sexes lie at the bottom of the anal sinus. Antennules of 

 moderate size, basal segment with stout posterior spine ; second 

 segment with stout anterior hook and rather slender latei'al 

 hook. Antennee with stout spine on basal segment. Immedi- 

 ately behind the insei-tion of the antennule is situa.ted a stout 

 accessory spine. Eyes somewhat small, about one-quarter breadth 

 of carapace apart. Suckers in the males rather small, •12-* 14 of 

 breadth of carapace; in the females rather large, 'IS-' 16 of 

 breadth of carapace. Maxillipeds fairly strong and moderately 

 armed ; basal segment produced into three stout spines ; " area " 

 of moderate size, oval shape, distinguished by red-brown pigment, 

 but only sparsely armed with spines. A pair of stout accessory 

 spines is situated between the bases of the maxillipeds, and 

 a second pair a short distance behind them. Flagella present 

 on the first two pairs of swimming-legs. In the male, vesicula 

 seminalis present on the third leg, copulatory peg and accessory 

 cushion on the fourth. In the female, basal segment of fourth 

 leg produced postero-laterally into sharply pointed lobe. Colour 

 (in spirit) light brownish grey, covered by an irregular series of 

 red-brown spots, which in part are aggregated together to form 

 definite blotches. Testes covered by irregular blotches of the 

 same pigment. 



Dimensions as follows : — 



Adult male (largest specimen). Adult female (largest specimen). 



mm. ram. 



Total length 12-2 Total length 10-6 



Length of carapace ... 7"1 Length of carajjace ... 8'1 



Breadth of carapace... 7*7 Breadth of carapace... 7-4 



Remarks. — This species aflfords a good example of the striking 

 differences in form of male and female specimens which are not 

 uncommon, although extremely inconvenient for incorporation in 

 any key. Both the shape and dimensions of the carapace, as 

 well as the nature of the abdomen, are markedly dissimilar in 

 the two sexes. While the red spots and blotches are certainly 

 characteristic of the species, it must be admitted that they are 

 not equally obvious on all specimens. They show little on 

 certain specimens in the collection, which are uniformly of a 

 darker brown colour, and they are less conspicuous on young 

 individuals. The posterior lobes of the carapace, especially in 

 the female, may sometimes nearly meet in the middle line, thus, 

 of course, altering the shape of the sinus and also covering the 

 bases of the fourth swimming-legs. 



Occicrrence. — Kibwesi, 19/12/04. From siu'face of head (one 



