I9I3'] Stani^ey Kemp : Crustacea Decapoda. 307 



neighbourhood of the orbit and a trifle concave towards the apex. 

 In the proximal half of the upper margin it bears a series of 9 to 

 16 teeth (10 to 13 in 71% of the specimens examined). They are 

 evenly spaced and movable and from o to 3 (usually i or 2) are 

 situated on the carapace behind the orbital notch. The distal half 

 of the rostrum is wholly unarmed dorsally, the small tooth found 

 close behind the apex in C. nilotica and numerous other species 

 being absent. On the ventral margin there are 2 to 8 fixed teeth 

 (4 to 6 in 87% of the specimens examined). These teeth are 

 placed in the distal half and the posterior one is, as a rule, 

 situated immediately below the foremost of the dorsal series 



(fig. 36). 



The antero-lateral margin of the carapace is obtusely lobed 

 below the orbital notch and immediately beneath this lobe there 

 is a strong antennal spine. The orbital notch is excavated to a 

 very unusual extent (fig. 37) ; the antero-lateral angles of the 

 carapace are rounded. 



The eyes are well pigmented. The segments of the antennu- 

 lar peduncle decrease progressively in length. The lateral process 

 reaches beyond the eyes but does not extend to the end of the basal 

 segment. The second segment is about one and two third times 

 as long as wide. The antennal scale is about three times as long 

 as broad and its straight outer margin terminates in a stout spine 

 which is far exceeded by the rather narrowly rounded apex of the 

 lamella. 



The third maxillipedes reach to the end of the second segment 

 of the antennular peduncle. 



i\ll the peraeopods are unusuall}^ slender. In those of the 

 first pair, which reach about to the extremity of the eyes, the 

 carpus (fig. 32) is three times as long as wide and is only very 

 slightly excavated anteriorly. The chela is longer than the carpus, 

 the dactylus is one and a half times as long as the palm and the 

 length of the propodus is about three and a half times its greatest 

 breadth. 



The peraeopods of the second pair (fig. 33) reach a little 

 beyond the end of the antennular peduncle. The carpus is 

 slender, about five and a half times as long as wide and is equal 

 in length to the chela. The dactylus is longer than the palm 

 and the breadth of the palm is less than a quarter the length of the 

 entire chela. 



The third peraeopods reach almost to the apex of the anten- 

 nal scale and the fourth to the end of the antennular peduncle. 

 The merus in each pair bears a single tooth in the middle of its 

 posterior margin and one at the distal end ; a similar tooth is 

 found at the end of the carpus. The dactylus bears from eight to 

 ten small teeth on its margin exclusive of the spinous apex. 



In the fifth pair (fig. 34) the propodus is longer than in the 

 fourth and the whole limb is consequently of greater length ; the 

 merus and carpus are usually provided with teeth as in the preced- 

 ing pairs. The slender dactylus is about one third the length of 



