554 CRUSTACEA. 



Length, 8-9 lines. Basal spine of inner antennae a little longer 

 than first joint, and extending about as far forward as apex of spine 

 of outer antennae, and half way to apex of basal scale of outer pair. 

 The beak is about two-thirds as long as first joint of inner antennae. 

 The outer maxilliped has the last joint short pubescent with short hairs 

 at apex. The smaller hand is oblong, nearly linear. The fingers of 

 larger hand are out of plane of hand. The hand of the second pair 

 is as long as the third, fourth, and fifth joints of the carpus. Fifth 

 joint of third or fourth pair quite long, more than, twice as long as 

 fourth joint, seven or eight sets of spinules below ; third joint some- 

 what pubescent. 



II. ROSTRUM INTER OCTJLORUM BASES ORTUM, SULCO PROFUNDO IN CARAPACE 



UTRINQUE EXCAVATO. 

 a. Orbittc margo inermia. 



ALPHEUS PTJGNAX. 



Rostrum acutum, anguste triangulatum, planum, inter oculorum bases 

 ortum. Spina antennarum externarum basalis parva; squama basi 

 paulo longior. Spina antennarum internarum basalis articulo Imo 

 non brevior, articulus 2dus brevis, Stius squamam externarum non 

 superans. Pedes antici incequi; manu majore elongata, Icevi, margi- 

 nibus rotundatd, supra angustd emarginata, digitis brevibus (manu 

 triplo brev ioribus) , brachio apicibus instar spince acuto. Pedes 2di 

 longi, articulo carpi \mo dimidio breviore quam 2dus. Pedes Btii 

 graciles, articulo Btio apicem inferiorem unidentato. 



Beak acute, narrow triangular, flat above, arising from between the 

 bases of the eyes. Basal spine of outer antennse small, basal scale 

 longer than base. Base of inner antennae shorter than scale of 

 outer; basal spine of inner antennaa not shorter than the first joint, 

 second joint short. Anterior feet unequal; larger hand long, 

 smooth with rounded margins, narrow emarginate above near arti- 

 culation, fingers short (about one- third the length of hand), arm 

 having a spine at both outer and inner apex. Feet of second pair 

 long, first joint short, hardly half the second in length. Third and 

 fourth pairs slender, third joint with an acute tooth at lower apex. 



