1922.] 



S. Kemp : Notes on Crustacea Decapoda. 



225 



or very slightly concave and ends in a strong spine which projects 

 a trifle beyond the end of the lamella. 



The exopod of the 

 third maxilliped reach- 

 es nearly to the end 

 of the antepenultimate 

 segment, the latter 

 bearing a series of 8 

 short spines on its 

 outer edge. The ulti- 

 mate segment is two- 

 thirds the length of the 

 penultimate. 



The first peraeopods 

 reach beyond the an- 

 tennal scale by the 

 chela and fully half 

 the length of the car- 

 pus. The carpus is a 

 little longer than the 

 merus and fully 14 

 times the length of 

 the chela. The fingers 

 are longer than the 

 palm and are unarmed. 



The second peraeo- 

 pods in the single 

 female examined are 

 equal and very slen- 

 der, reaching beyond 

 the scale by the chela, 

 carpus and one-third 

 the length of the me- 

 rus. The merus bears 

 a spine at the distal 

 end of its lower border ;' 



it is rather more than 11 times as long as broad and is exactly 

 equal in length with the carpus. The carpus is unarmed and is 

 nearly 9 times as long as its distal breadth. The chela is almost 

 1*25 times the length of the carpus or merus. The palm is 4*5 

 times as long as wide and 13 times as long as the fingers. The 

 fingers have inturned tips ; their cutting edges are entire distally, 

 but in the proximal third are provided with a few small teeth. 



The last three peraeopods are all very slender. The fifth 

 reach beyond the scale by the dactylus and more than half the 

 propodus. In the third pair the merus is about 18 times as long 

 as wide. The propodus is entirely devoid of spinules on its poste- 

 rior margin and is scarcely more than twice the length of the 

 dactylus. The dactylus itself is simple, slightly curved and 

 extremely slender, about 14 times as long as its basal breadth. 



Text-fig. 65. — Periclimenes digitalis, sp. now 



a. Antennule. b. Antennal scale. 



c. Mandible. 



