CANCROIDEA. 277 



together constitute this lobe scarcely projecting at all beyond the 

 point where the median tooth begins. The antero-lateral margin is 

 ciliate, and also both margins of the arm and the upper margin of the 

 hand inside. The posterior side of the median region is in the same 

 line with the posterior lateral teeth. The male abdomen is quite 

 regularly triangular, a little oblong. On the outer side of the hand 

 there is one very prominent and thin carina. The outer maxillipeds 

 have the third joint oblong, longitudinally concave, and very oblique, 

 it curving outward over the summit of the palpus, and at the same 

 time bending, so as to present, to the front view, a surface instead of 

 an edge. Inner surface of hand, especially the lower half, granulous; 

 under surface nearly flat, smooth, and shining. 



This species resembles somewhat the Amphitrite gladiator of De 

 Haan, as figured by him on Plate 18, f. 1, though unlike his figure 5 

 on Plate 1 of the same species. From both it differs in the front, 

 and in other characters. 



2. Dens lateralis posterior valde elongatus. 



Amphitrite longi-spinosa. 



Carapax areolatus, pernio transversus, spina laterali diametro carapacis 

 non duplo breviore, pawlo reflexd, dentibus antero-lateralibus 5 (angulo 

 orbitce excluso), minutis, non contiguis, inter sese subceque remotis, 

 fronte inter-antennali i.-dentato, dentibus medianis minutis, exterioii- 

 bus prominenter triangidatis. Pedes antici mediocres, manu supernt* 

 3-spinosd, carpo 2-spinoso, brachio apicem externum uni-spinoso, mar- 

 ginem anticum 3-spinoso. 



Carapax areolate, a little transverse, lateral spine as long as half the 

 breadth of the carapax, somewhat reflexed ; antero-lateral teeth 

 five, minute, not contiguous, nearly equally spaced; inter-anten- 

 nary front four-toothed, the two median teeth minute, the others 

 prominent triangular. Anterior feet of medium size, hand with 

 three spines above. Carpus with two spines, arm with a single 

 spine at the outer apex, and three on the inner margin. 



Plate 17, fig. 2a, animal, enlarged three diameters; b, male abdo- 

 men ; c, outer maxillipeds. 



70 



