i78 PALAEMON VOLLENHOVENir, 



allied to Pal. Idae Heller. The surface of the cephalo- 

 thorax is smooth ; the two last teeth of the upper margin 

 of the rostrum are situated upon the cephalothorax pos- 

 terior to the eyes. The arm of the second pair of legs is 

 cylindrical and thickened , the wrist thickened anteriorly 

 is longer than the arm , and longer than the palm , the 

 fingers are half as long as the palm in the adult male, 

 closely united to one another , and covered with coarse 

 hairs ; the immoveable finger is provided with a very small 

 tooth at its base. 



In a male specimen that has a length of 110 mm., the 

 larger leg of the second pair is 140 mm. long, the arm 

 measuring 31 mm., the wrist 42 mm., the palm 32 mm., 

 and the fingers 18 mm. 



Pal. macrobrachion Herklots may be distinguished from 

 the Japanese Pal. longipes de Haan by the slender rostrum , 

 the upper margin being slightly convex , and curved upward 

 towards the apex , the rostrum reaching to the end of the scale 

 of the external antennae , by the second pair of legs being 

 comparatively shorter , and by the closely united very 

 hairy fingers. 



P alaemon Vollen h oven ii Herklots. 



Herklots , Tijdschrift Nederl. Entomol. vereeniging , Deel I, 

 p. 96. 



Only the female of this species was known to Mr. Her- 

 klots ; the Museum however has received some time ago 

 an adult male and a still greater female of this species 

 from the Congo coast , so that I have now been enabled 

 to complete our knowledge of this form. 



The fine male specimen has a length of 140 mm.; the 

 cephalothorax is 70 mm. long and the rostrum measures 

 40 mm. ; the rostrum is longer than the peduncle of the 

 internal antennae, almost as long as the scale of the 



12 

 external antennae, — toothed, the four last teeth on the 



4 

 Notes from the Leyden ]VIu.seixm* 



