BRITISH CEUSTACEA. 



DEC APOD A, LEPTOPODIADM. 



nilACHYURA. 



<JENUS STENORYNCHUS, LAMARCK. 



CANCKK, Linn. Penn. Herbet. 



INACHLIS, Fabr. 



MAIA, Bosc. 



MACROPUS, Latr. 



MACROPODIA, Leach. 



STENORYNCHUS, Lamk. Edwards. 



Generic character. External antennce setaceous, the basal joint 

 narrow, the second * inserted close to the side of the rostrum, very 

 short ; the third, three times as long as the former. External 

 pedipalps narrow, the second joint considerably produced internally 

 at its apex ; the third joint oval. Anterior feet shorter, and much 

 larger (in the male) than the succeeding ones ; equal ; the hand 

 somewhat ventricose ; the fingers slightly inflected. The remaining 

 pairs very long and slender, diminishing in length from the second 

 to the fifth ; the nails of the second and third pairs long, slender, 

 and curved only at the apex ; those of the fourth and fifth shorter, 

 curved at the base and somewhat falciform. Eyes not retractile, 

 larger than their peduncles, oval, pointed at the apex and setiger- 

 ous. Carapace triangular ; rostrum taper and bifid. Abdomen 

 six-jointed, the terminal portion being formed by the union of the 

 sixth and seventh joints. 



* Leach calls this the first joint of the antennas, as he does not reckon the 

 basal joint, which is fixed, and, as it were, soldered to the parts contiguous, as in 

 most of the higher forms of Crustacea. 



B 



