20 HISTORY OF BRITISH CRUSTACEA. 



Fam. MAIJDJE, M. Ediv. 

 Legs of moderate size ; the second and third pair never 

 double the length of the postfrontal portion of carapace ; 

 first pair often longer and thicker than the following : ba- 

 silar portion of onter antennae much developed. 



Gen. 4. AECTOPSIS, Lam * 



Carapace more or less triangular; the front elongated 

 and armed with four horns directed forwards, the two cen- 

 tral forming a kind of beak. Eyes with short peduncles, 

 which can be reflected in the orbits. Outer antennae with 

 first joint narrow. Abdomen seven- jointed in both sexes. 

 First pair of legs in male much longer than the others. 

 Four hind pairs of legs with spines on the lower surface of 

 the tarsi; second pair of legs much longer than the third. 



Arctopsis tetraodon, Penn. sp. Four-horned Spider 

 Crab. — Carapace a fourth longer than wide, posterior part 

 regularly rounded, side with four strong spines ; third and 

 fourth joints of fore legs tubercular. 



Carapace and greater part of legs covered with a dense 

 coat of short hairs. 



* Pisa, Leach. 



