CRANGON. 
CANCER. Linneé. 
ASTACUS. Pennant. 
CRANGON. Fabr., Lair., Bosc, Leach. 
Antenne superiores setis duabus in eddem feré linea horizontali insertis : interiore longiore. 
inferiores corporis longitudine setacee decrescentes squama ad apicem externé uni- 
dentaté pedunculo adnexa : articulo primo ad squama medium non producto. 
Palpi pediformes articulis quatuor exsertis: duobus ultimis longitudine zqualibus ; hdc apice 
obtuso. 
Pedes decem: par anticum majus compressum subdidactylum ; pollice brevissimo : par secun- 
dum elongatum tenue didactylum: par tertium tenue precedente longiore subcrassiore 
ungue simplici instructum: paria 4 et 5 pracedente crassiora unguibus compressis 
instructa. 
Abdomen 6-articulatum. 
Cauda pentaphylla : lamellis lateralibus angustis. 
Upper antenne with two sete inserted in nearly the same horizontal line ; the inner one 
longest. Under antennz as long as the body, setaceous, with a large scale, having its apex 
externally armed with a spine, at their base: first joint not produced to the middle of the squama. 
Pediform palpes with four exserted joints ; the two last equal in length ; the latter with the apex 
obtuse. Legs ten: anterior pair largest, compressed, subdidactyle, with the thumb very short : 
second pair elongate, slender, didactyle: third pair slender, longer, and rather thicker than 
second pair, furnished with a single claw : fourth and fifth pairs thicker than the preceding, 
with compressed claws. Abdomen six-jointed. Tail composed of five plates ; the lateral ones 
narrow. 
