1901.] CRUSTACEAN FKOM THE SOUDAN. 97 



posteriorly, and the posterior margin is one-third longer than the 

 length of this segment. The penultimate segment is just as long 

 as the terminal, and trapezoidal ; the anterior margin is in pro- 

 portion to the posterior as 4 : 5, and the lateral margins are a 

 little concave. The abdomen is smooth, punctate, especiall}' near 

 the anterior margin of the segments. 



The chelipedes (Plate X. fig. 1) are nnequal, the right being the 

 larger. The merus o£ the right chelipede extends but little beyond 

 the lateral margin of the carapace. The upper margin is covered, 

 except at the base, with transverse tubercular rugosities, and on 

 the inner surface, close to and parallel with the smooth proximal 

 part of the upper margin, is seen a row of six or seven small 

 rounded tubercles that decrease in size anteriorly ; this row 

 reaches almost to the middle ol the arm, and next to each of the 

 first three tubercles there exists a much smaller tubercle. The 

 anterior edge bears a double row of rounded tubercles ; the 

 internal row is formed by nine or ten that are not contiguous to 

 one another; the external series bounding the anterior surface of 

 the joint consists of about twice as many tubercles, but these 

 are smaller, unequal, and contiguous to one another. About 2 

 millimetres from the anterior margin there is, on the anterior 

 surface near the carpal articulation, a somewhat larger tubercle, 

 with convex sides and rather a sharp point ; around it several 

 smaller granules are distributed, and a row of five or six larger 

 ones extends from this tubercle to the lower margin of the arm. 

 The lower margin bears along its whole length a row of fourteen 

 or fifteen rounded smooth tubercles, that slightly increase in size 

 distally and are somewhat larger than those of the anterior margin 

 of the joint. The outer surface is finely punctate, but otherwise 

 smooth. The carpus is a little tubercular along its internal margin, 

 behind the acute, slightly depressed spine at the inner angle ; beneath 

 the latter there is another spine, only half as large and making a 

 right angle with the larger. A little behind this smaller spine, 

 on the lower border of the inner surface, there is a trace of a 

 third in the form of a small blunt tubercle. The upper and 

 outer surface of the wrist is punctate and smooth. The larger 

 hand (fig. 7) resembles that of P. Mlgendorfi, llilgendorf {I.e. 

 fig. 3). It is almost exactly as long as the cephalothorax is broad, 

 and the fingers, that are somewhat less gaping than on the quoted 

 figure 3, measure three-fifths of the whole length of the hand. 

 The palm, near the articulation of the fingers, is about as high 

 as it is long, measured horizontally; it is somewhat granular 

 along the inner margin of its upper surface, but for the rest it 

 appears smooth and shining ; by means of a lens a fine punc- 

 tuation is, however, observed, the punctures being disposed 

 partly in longitudinal rows. The internal surface is also smooth, 

 only a few granulations are seen close to and on its lower border, 

 but" these granulations are not visible when the hand is looked at 

 from the outer side. The rather strongly compressed fingers are 

 somewhat bent inward ; they are regularly tapering and end in 



Peoc. Zool. Soc— 1901, Vol. I. No. VII. 7 



