5^ 



African species it is plainly widened. The new specific name for 

 the latter alludes to Krauss's remark upon the beautiful marking 

 ojf the pleon. 



CiROLAXA I'LUVIATILIS, n. Sp- 



This species is closely allied to Cirolana pleonastica, described 

 and figured in "' Willey's Zoological Results/' Part 5, p- 629, pi- 

 67 A, 1900. Between the mouth organs ot the two there seems to 

 be no difference on which to lay any stress. It may, how^ever, be 

 mentioned that in the present species^ out of the thirteen setae 

 fringing the inner plate of the second maxillge, eight instead of 

 three are conspicuously plumose^ and in the maxillipeds the 

 terminal joint narrows distally instead of widening- The antennae 

 are more distinctive, for here in the first pair the first two joints 

 are clearly separate^ the first distally widened, the third is as long 

 as the preceding two combined ; the flagellum con- 

 sisting of ten or eleven unfurnished joints, is as in the 

 other species equal in length to the peduncle ; in the 

 second pair the peduncle is a little longer than the first antennae, 

 its fifth joint is clearly longer than the fourth, the flagellum is 

 more than twice as long as the peduncle, and consists of about 

 :forty joints, varying from under to over that /number], of th,e 

 earlier joints some fourteen or fifteen carrying rather conspicuous 

 little tufts of setae. 



The surface of the peraeon is somewhat pubescent, especially at 

 the sides; the hind rim of the seventh segment carries about 

 eighteen tubercles. Of the pleon, the third, fourth, and fifth seg- 

 ments have the hind margin tuberculate, the fourth has its sides 

 strongly produced over the produced and rounded sides of the 

 fifth^ the produced lobes of the fourth having the peculiarity of a 

 lateral slit, such as might be expected to indicate two segments 

 in coalescence, of which there is here no question. The telsonic 

 segment is triangular, with straight sides, the breadth at the base 

 equal to the median length. At the upper part of each side there 

 is a small ridge, and on either side of the middle line there is a 

 l^artial carina formed in two or three sections- beginning near 

 the base, but not reaching the narrowly-rounded apex, the orna- 

 mentation being thus a kind of link between that of C sulcata and 

 C- pleonastica. The lower half of the segment is fringed with 

 plumose setae, among which are four spines at the apex, and two 

 •on each side in notches above the apex, not as in C. pleonastica, 

 eight together round the apex- The inner ramus of the uropods 

 reaches beyond the telsonic segment, and is not a very broad 

 o\'al, but V; road er and longer than the outer ramus. Colour (in 

 formalin) uniform, a dull pinkish brown, probably not to be relied 

 upor. as characteristic. Size, 12 mm. long, by 4.5 mm. broad. 



Locality: — Two miles up the Buffalo River. This is described 

 :as a tidal river. The specific name alludes to the place of capture. 



