STALK-EYED CRUSTACEA i8i 



centre, above the epigastric line, there is a blood-red spot, 

 and another a httle smaller more behind. Teeth of the 

 antero-lateral border directed forwards and unequal. 

 Lateral horns sharp, and directed slightly in front. Front 

 very advanced, slightly flattened, and cut into six teeth, 

 of which the two median are the most prominent. 

 Between the intermediate teeth and the external there is, 

 on each side of the front, a deep notch. Orbits wide and 

 deep ; the superior orbital border is straight. Epistomian 

 apophysis does not exceed the front. The legs of the 

 first pair moderately elongated. Fourth joint has three 

 or four spines on its anterior border, and a small one on 

 the extremity of its posterior border. The fifth has a long 

 and fine spine on its antero-internal angle, and another, 

 not so large, on its external face. Hand, feebly keeled, 

 has two spines ; one above the articulation of the fifth 

 joint, and the other about one-third of the distance of the 

 internal edge of the upper surface. The walking legs are 

 spotted with red. The sternal plastron is rough as well 

 as the first segment of the abdomen. 



The abdomen of the male is triangular, with a wavy 

 edge. 



Range. — West Indies, Florida. 



Subgenus Achelous. 



AcJielous De Haan, A. Milne Edwards. 



Achelous (subgenus). Miers. 



The carapace is narrower; lateral epibranchial spine 

 no longer or very little longer than the preceding teeth 

 of the antero-lateral margin. The spine on the inner 

 margin of the fifth joint of the first pair of legs is normally 

 developed. 



