1922. j 



S. Kemp : Notes on Crustacea Decapoda. 



207 



11 times as long as the merus, from 7 to 10 times as long as it^ 

 distal breadth and from 1*4 to 1 7 times as long as the chela ; it is 

 proportionately longest and most slender in adult males. The 

 fingers are about equal in length with the palm and are unarmed. 

 The second peraeopods of adult males (text-fig. 566)"extend 

 beyond the antennal scale by the chela, carpus and a portion of 

 £he merus and may be as much as 6 times the length of the 

 carapace. They do not show the minute asperities with which the 

 second legs of the two preceding species are covered and there is 

 no tubercle at the distal end of the ischium. The merus bears the 

 usual strong spine at the distal end of the lower border and, in 

 adults, is from 8 to 9 times as long as broad. In all well grown 

 males the merus is very slightly longer than the carpus, from ro5 

 to 11 times its length ; in small males the merus and carpus are 

 equal or the latter is a shade the longer. The carpus is from 6 to 

 7 times as long as its distal breadth in adults, but in young males 

 is more slender, sometimes as much as 9 times as long as wide. 

 The carpus always bears a conspicuous spine on the inner side of 

 its distal margin and in large males there is in addition a small 

 acute projection or tooth on the upper and inner aspect (text-figs. 

 57a, b). The chela is from r8 to 22 times the length of the carpus 

 in adults, in young specimens 15 times or even less. The palm in 

 large specimens is about 6 times as long as wide ; in adults it is 

 from i - 8 to 2"i times as long as the fingers, in young males pro- 

 portionately shorter, from 1*5 to 1*7 times. The fingers resemble 

 those of P. agag ; in some specimens they are excavate on their 

 inner margins, in others 

 they meet throughout 

 their length when shut 

 and bear a series of 

 small teeth in their 

 proximal two-thirds. 



In females (text-fig. 

 56c) the second perae- 

 opods are more slender 

 and proportionately 

 shorter than in adult 

 males. The carpus 

 is equal to or a little 

 longer than the merus 

 and is 8 to 9 times 

 as long as its distal 

 breadth. As in males 

 the carpal spine is con- 

 spicuous. The chela is 

 from i'35 to i'6 times 

 as long as the carpus, 

 with the palm about 



1*4 times the length of the fingers. The fingers have some incons 

 picuous teeth in the proximal half. 



CO. O. 



rEXT-Fio. 57. — Periclimenes andamanensis, 

 sp. nov. 



a. Carpo-propodal articulation of right second 



peraeopod of male, viewed from above. 



b. The same, viewed from inner side. 



