BRAXCHIURA FROM LAKE TA>^GANYIKA. 271 



specimen on eyeball) of very large Lates microlepis (length 

 1340 mm.). Thirteen male and five female specimens. 



Maswa, 15/1/05. Mostly from the surface of the body of a 

 number of Lates microlepis. Fifteen males, seven females. 



Ndanvie, 8/2/05. From surface of head and body of large 

 specimen of Lates microlejns. Seventeen males, three females. 



As will be seen from the above, this form has always been 

 found infesting specimens of Lates, and never in association with 

 any other species of Ai-gulid. 



Argulus perso:naxus, sp. n. (PI. XLI. figs. 6-8 ; PI. XLIV. 

 figs. 23-25.) 



Descrij^tion. — Carapace elliptical, longer than bi'oad, with 

 rather pronounced anterolateral depressions. Posterior lobes 

 broad and rounded, covering bases of all but fourth swimming- 

 legs : in a female distended with eggs the third swimming-legs 

 are only partially covered. The lobes are separated by a mode- 

 rately broad sinus, about one-fifth the length of the carapace or 

 sometimes more. The edge of the carapace below is well armed 

 with very small spines, which extend to the region of the 

 swimming-legs. Abdomen in the male two and a half times as 

 long as broad, about two-fifths entire length of body ; posterior 

 lobes bluntly pointed and separated by moderately broad sinus 

 two-fifths length of abdomen. Abdomen in the female about 

 one and a quarter times as long as broad, more than one-quarter 

 entire length of body ; posterior lobes bluntly pointed, and 

 separated b}^ moderately broad sinus more than one-half length 

 of abdomen. The furcal appendages are small and inconspicuous 

 and lie at the bottom of the anal sinus. Antennules of modei^ate 

 size, basal segment with stout posterioi- spine ; second segment 

 with small anterior hook, posterior spiniform process, and lateral 

 hook of medium size. Antennae with small spine on basal 

 segment. Immediately behind the insertion of the antennule is 

 situated a stout accessory spine. Eyes rather large, about one- 

 quarter breadth of cara,pace apart. Suckers of moderate size, in 

 the males 'IS-* 15, in the females •10-*18 of breadth of carapace. 

 Maxillipeds strong and well armed ; basal segment produced into 

 three stout spines; "ai'ea" large, pear-shaped, and armed with 

 small spines. A pair of stout accessory spines is situated 

 between the bases of the maxillipeds, and a second pair, rather 

 slighter, 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 addition, a small backwardly directed process is 

 present near the base of the second leg, and a considerable conical 

 projection on the anterior face of the third leg. In the female, 

 basal segment of fourth leg produced postero-laterally into pointed 

 lobe. Colour (in spirit) light yellowish brown, the testes covered 

 by ii'regular blotches of darker brown. 



