558 THE REV. T. R. R. STEBBING ON [May 26^ 



maro-in of the seventh segment being uniformly arcuate and 

 strongly produced over the pleon ; the third, fourth, and fifth 

 pleon segments are not adpressed, but have their postero-lateral 

 angles well displayed ; the convergent sides of the telson are 

 slightly incurved. The first gnathopods have the sixth joint a 

 little less widened distally than in the other species, but the 

 difierence is slight. The uropods have the inner ramus attached 

 slightly in advance of the outer, which is fully double its length, 

 therefore relatively much longer than in P. anmdicornis Budde- 

 Lund, as shown in the figure by Dollfus (Mem. Soc. Zool. de 

 France, vol. viii. p. 184, 1895), from Diego Suarez. 



In the general colouring of brown, variegated with lighter 

 markings, on the back, this species agrees with Philoscia mus- 

 corum and several allied species. It has a thin light stripe 

 extending from the back of the head nearly to the tip of the 

 telson. In the person this is flanked on either side by a broad 

 piece of variegated pattern, while the side -plates are dark, each 

 with one conspicuous light patch, but not, as in P. annidicornis, 

 having the postero-lateral angles pellucid. In the j)leon the first 

 two segments and the telsonic segment have each three light 

 patches — one belonging to the medio-dorsal stripe, the others 

 separated from it by dark patches. The second antennae have the 

 long fifth joint proximally dark and distally light. The uropods 

 have the peduncles generally light and also the proximal part of 

 the outer ramus ; but this is variable, as one specimen shows one 

 of these rami light to the apex, though the other is dark except 

 close to the base. 



In A. karongce the colour is similar, but rather more dusky, the 

 medio-dorsal stripe being also less continuous, and in one specimen 

 the hinder segments of the j^erajon have their apices clear instead 

 of dark. 



Dollfus (loc. cit.) remarks of P. anmdicornis : " This species is 

 variable ; the specimens of the type (coming from Mount Ambre) 

 are all of great size (12 mm. by 6"5 mm.). Generally, above all in 

 the plain, the length does not exceed 7 to 8 mm. ; sometimes the 

 joints of the flagellum of the second antennae ai-e subequal ; but 

 above all there are varieties ex colore : the clear spaces at the 

 angles of the pera?on may be lost, or instead of them there may 

 be marblings or patches [such as those] situated in the median 

 region ; the antennas are often either entirely light or entirely 

 dark." The original says, " les taches claires des angles du 

 pereion peuvent s'effacer, ou etre remplacees par des marbrures 

 ou taches situees dans la region mediane," where a word or two 

 seems to be missing from the second clause. 



Specimens of A. cunningtoni measured 7 mm. b}^ .3'5 mm., or 

 6 mm. by 3 mm., the antennae and uropods in each case not 

 included. 



Locality. Under stones, near Niamkolo Bay, Lake Tanganyika. 



