1922.] 



S. Kemp : Notes on Crustacea Decapoda. 



181 



divided by fine incisions into series of blunt-tipped teeth (text- 

 fig- 39 & )- 



The second peraeopods are usually unequal and are remarkable 

 in that they exhibit four distinct types of structure within the 

 limits of the species. The segments are always unarmed. In 

 type a, the most highly developed form (text-fig. 38a), the limb 

 may reach beyond the scale by more than half the length of the 

 chela. The carpus is conical, little longer than broad and not much 

 more than half the length of the merus. The chela is from 27 



Text-fig. 38. — Periclitnenes diversipes, sp. nov. 

 The four types of second peraeopod. 



to 3*3 times as long as the merus and the fingers are less than half 

 the length of the palm. The dactylus is normal in form with 

 straight or nearly straight, cutting edge and an inturned tooth at 

 the tip. The fixed finger is very strongly curved and is provided 

 at the apex with a short chisel edge with a blunt tooth at either 

 end, opposed to the distal part of the dactylus. Owing to 

 the strong curvature of the dactylus the fingers gape considerably 

 when the claw is closed. 



The second peraeopod of type b (text-fig. 386) l may be 

 nearly as large as type a. The carpus is more slender and the 



1 The chela is viewed a little obliquely and its full breadth is consequently 

 not shown. 



