S2 GENUS PORTUNUS. 



Genus PORTUNUS. 



Terminal joint of the hind feet formed for swimming. 

 Peduncles of the eyes short, not reaching the anterior 

 angles of the shell. Thorax transverse with five (rarely 

 six) teeth on each side. 



SPECIES. 



1. F. pictus. Tliorax with five prominent, acute 

 teeth, each side; Ciypeus one- toothed; Carpus twc-spin- 

 ed and one on the anterior angle of the hand above; ter- 

 minal joint of the hind feet rounded at tip. 



Inhabits sandy slK)res of the sea. Common. 



Plate 4>. Jig, 4. 



Thorax with minute granulae, white, with very nu- 

 merous red points; four lateral, equal, acute, spiniform 

 teeth, and a similar equidistant one at the hind auide of 

 the orbit of the eye; Orbit oval, with a strong, advanced 

 tooth on the inferior edge, and a perceptible fissure or 

 impressed line above; second joint of the peduncle of the 

 external pedipalpi deeply emarginate at the inner tip; tooth 

 of the clypeus longer than those of the interior canthus of 

 of the eyes, which are also prominent; Thighs silvered 

 above near the tips, second joint of the tibia with an 

 impressed line each side, tarsi compressed, with two 

 impressed lines behind, and one before, posterior ones 

 oval, rounded at tip; Carpus silvery above and spot- 

 ted with red, two-spined, the inner spine larger and 

 very acute, external one flattened above; Hands equal, 

 almost linear, above silvery, spotted with red, outer edge 

 prominent, and with the inner one granulate, an acute 

 spine at the inner anterior angle, thumb silvered above, 

 edges prominent, and with the finger somewhat linear, 

 hooked at tip, and furni:>hed with irregular teeth; penul 



