PALAEMON VOLLENHOVENII. 179 



cephalothorax being posterior to the eyes. The outer foot- 

 jaws are as long as the peduncle of the internal antennae. 

 The first pair of legs are 70 mm. long, and project with 

 the greater half of the wrist beyond the antennal scale. 

 The second pair of legs are a little unequal , the left being 

 the larger one, and they measure 195 mm. and 155 mm. 

 respectively ; the arm of the larger leg projects a little beyond 

 the antennal scale, measuring 35 mm., the carpopodite 

 32 mm., the nearly cylindrical palm 62 mm. and the 

 fingers 45 mm. — The fingers are somewhat curved, the 

 tips crossing one another; the moveable finger is provided 

 with a strong tooth somewhat behind the middle , and 

 with three much smaller teeth behind the latter at its base , 

 the interior tooth being a little larger; the immoveable 

 finger is also armed with a large tooth at the base and 

 a smaller one behind the latter. — The whole leg is covered 

 with numerous small spines which are somewhat stronger 

 at the inferior margin of the various joints ; the fingers , 

 especially the immoveable one, are a little hairy at their 

 bases. — The third pair of legs are somewhat longer than 

 the antennal scale, but the fifth pair do not reach to the 

 tip of these scales. 



The female specimen is 130 mm. long , the cephalothorax 



12 

 measuring 60 mm.; the rostrum is — dentate and shorter 



than the antennal scale. The second pair of legs are 

 equal, much feebler than those of the male, 115 mm. long, 

 consequently somewhat shorter than the body ; the arm is as 

 long as the peduncle of the internal antennae and has a length 

 of 22 mm., the carpopodite measuring 20 mm., the palm 

 28 mm., and the closely united fingers 24 mm. ; the fingers 

 have no teeth, the tips crossing one another. 



Pal. VoUenhovenii Herklots is the representative of the 

 American Fal. Jama'kensis Herbst on the western coast 

 of Africa and nearly allied to that species. But it is a 

 much more interesting fact that the African species is also 

 most closely allied to the Japanese Pal. brevicarpus de Haan , 



Notes rrom the Leyden IMuseuiTi. 



