EUPAGURUS. 497 



although the genera cannot well be confused. The 

 species of Anapagurus at present recorded from British 

 seas may be thus distinguished.* 

 Anapagurus — 



1. Internal antennae, three to four times the length 

 of the eyestalks, which are short and thick. Ambulatory 

 limbs slightly pubescent. — A. hyndmanni . 



2. Internal antennae about twice as long as eye- 

 stalks, longitudinal orange band on hand. Ambulatory 

 limbs almost smooth ; a few small spines on anterior 

 borders. Right chelipede of male enormously developed. 

 Row of small spines on wrist of left chela. — A. laevis. 



3. Internal antennae about three times the length of 

 eyestalks, which are slender. Chelipedes pubescent. 

 Right hand elongate, ovate and smooth, in length 

 equalling the wrist. Left chela slender with nearly 

 parallel sides. Ambulatory limbs smooth, slightly 

 pubescent. — A. chirocanthus, Lilljeborg. (A. ferrug- 

 ineus, Henderson). 



The key to the British Eupaguridae given below has 

 for its justification the fact that it enables one to identify 

 the living animal, when means of removing it from its 

 shell are not readily available. 

 Eupagurus — 



1. Chelae naked. 



(a) Limbs tuberculate and spiny on upper border. 

 Strong rostrum. 

 Dactyl contorted. 



E. bemhardus. 

 (b) Limbs granulate. 



Weak rostrum. 

 Dactyl straight. 



E. jjrideauxii. 



* Henderson. Proc. R. Phys. Soc. Edin., vol. IX., 1885-8. 



