. The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . ionsexhibiting an irregular series of small, slightly oblique and granular ridges. Post-frontal crest distinct, with median notch and partial lateral interruptions, but notextending to margins. Antero-lateral margins shorter than postero-lateral, armedwith 2-3 spines, in addition to that at the outer angle of the orbit. Second joint ofantenna extending to under border of front, and bearing a short flagellum. Cheli-peds in the male unequal, subequal in the female ; me
. The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . ionsexhibiting an irregular series of small, slightly oblique and granular ridges. Post-frontal crest distinct, with median notch and partial lateral interruptions, but notextending to margins. Antero-lateral margins shorter than postero-lateral, armedwith 2-3 spines, in addition to that at the outer angle of the orbit. Second joint ofantenna extending to under border of front, and bearing a short flagellum. Cheli-peds in the male unequal, subequal in the female ; merus rather short, trigonous,with spine on outer margin ; carpus with two spines on inner margin. Ambulatorylegs rather long and slender. Colour (in spirit) light yellowish-brown, with darkbrown or reddish spots. * It should h)e noted further that the same species of Thelphusa which are foundabout the shores of Nyassa and other great African lakes, occur also about Tanganyika,but since these crabs are practically terrestrial, I have omitted them from the Tangan-yika list. t Cunnington, Pre Zoo. Soc, Part III., 1899, p. Fig. I.—Liiiuiothclphusa ntacidata. I, Adult male, general view from 2\. 2, Ventral view of the anterior portion to show the relations of buccalframe, epistome, antennules, and antenna:. 3, Ventral view of posterior portionof thorax, abdomen removed showing abdominal appendages and male genitalpapilltE. 4, External maxilliped. 5, Dactylus of walking leg, to show the natureof the spinules. 6, Terminal portion of cheliped. 7, Male abdomen. (AfterCunnington.) 282 TirE TANGANYIKA PROBLEM. Dimensions as follows : — Adult male (largest specimen) : mm. Length of carapace . . . . 12 Breadth of carapace ........ 15-4 Length of larger cheliped alK)ut Length of second ambulatory leg . . alxDut 21 Adult female : Length of carapace . . . . • ii-5 Breadth of carapace ........ 13-6 Length of cheliped about Length of second ambulatory leg . . alxjut
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