1922.] 



S. Kemp: Notes on Crustacea Decapoda. 



177 



The lateral process of the antennule reaches to the middle of 

 the basal segment and the terminal spine of this segment is 'well 

 developed (text-fig. 34ft). The second and third segments are 

 rather slender and subequal. 

 The free portion of the shor- 

 ter ramus of the outer an- 

 tennular flagellum is about 

 two-thirds the length of the 

 fused basal part, the latter 

 comprising from 5 to 7 seg- 

 ments. The antennal scale 

 (text- fig. 34c) is 3, or rather 

 more than 3 times as long as 

 wide. The outer margin is 

 usually a little concave and 

 ends in a spine which 

 reaches almost or quite to 

 the end of the lamella. 



The third maxilliped bears 

 on arthrobranch : the ulti- 

 mate segment is about two- 

 thirds the length of the 

 penultimate. The first per- 

 aeopods (text-fig. 35a) reach 

 about to the end of the 

 antennular peduncle. The 

 merus, carpus and chela 

 are subequal in length 

 and the fingers, which are 

 unarmed, are about 1*25 

 times the length of the 

 palm. 



The second peraeopods (text-fig. 35ft) are shorter than usual, 

 extending beyond the scale by not more than half the length of 

 the chela. There are no distal spines on the merus or carpus. In 

 large specimens the carpus is a little shorter than the merus and 

 equal to or slightly shorter than the palm; in smaller individuals 

 the carpus is proportionately rather longer. The palm is a little 

 inflated and is as long as or a trifle longer than the fingers. The 

 fingers have inturned tips and straight cutting edges, with one or 

 more small teeth at the proximal end. 



The last three pairs of peraeopods (text-fig. 35c) are slender 

 and short, the third reaching by only a dactylus-length beyond the 

 eye. The propodus bears a series of slender spines, frequently 

 arranged in pairs, on its inferior margin and is from 3*5 to 4 

 times the length of the dactylus. The dactylus is moderately 

 curved and is simple. 



The sixth abdominal somite is 1*5 times the length of the 

 fifth. The two pairs of dorsal spines on the telson are large and 

 are placed so as to divide its length into three equal parts. The 



Text-fig. 34.- 

 Borradaile. 



a. Eye. 



b. 0. 



-Periclimenes seychellensis 



b. Antennule. 

 Antennal scale. 



