540 CRUSTACEA. 



minal and lateral process, still has the appearance of having a simple 

 corona with a continuous cutting edge ; yet the dentate portions are 

 distinct, and the intermediate edge is setigerous or ciliate. The abdo- 

 men is twice as long as the carapax, and is not inflexed at the third 

 joint. 



GENUS ATYOIDA, Randall. 



Atyae affinis. Pedes 6 postici tenues, 5ti Btiis longiores. 

 Near Atya. Six posterior feet slender, fifth pair longer than third. 



Among the species of Atya, there is a very great difference as to 

 the relative size of the third and following pairs of legs; and it seems 

 possible that the transitions may be such as to render it unnecessary 

 to sustain the genus Atyoida. 



ATYOIDA BISULCATA ? Randall. 



Rostrum oculis paulo longius, acutum, supra carinatum. Carapax 

 infra oculos acutus, quoque angulis anlicis lateralibus acute productus. 

 Carpus pedum 4 anticorum antice valde excavatus, U-formis. Pedes 

 6 postici subtiliter scdbriculi, Stiiktique cequi, 5ti paulo longiores, par ce 

 tenuiores. Maxillipedes externi apicem squamce antennalis non attin- 

 gentes. 



Beak longer than eyes, acute, carinate above. Carapax below the 

 eyes acute, and also at its lateral anterior angles acutely produced. 

 Carpus of four anterior feet deeply excavate, U-shape. Six poste- 

 rior feet minutely scabrous, third and fourth pairs equal, fifth a 

 little longer and somewhat more slender. Outer maxillipeds not 

 reaching to apex of antennary scale. 



Plate 34, fig. 1 a, animal, enlarged two diameters ; b, mandible, 

 more enlarged ; b', crown in different position ; c, first maxilla, outer 

 view; c', same, inner view; d, second maxilla; e, first maxilliped ; 

 f, second maxilliped with palpus broken; g, outer or third maxilliped; 



