MAIOIDEA. 

 Sandwich Islands, Oahu or Maui. 



Length of carapax, seven and one-half lines ; greatest breadth, six 

 lines; length of beak, hardly one line; part of carapax posterior to 

 cardiac tubercle, about half as long as the part anterior. 



In the outline of the carapax, there is a slight excavation marking 

 the limit of the orbit ; and the breadth of the beak at base is not over 

 one-third the distance across in the line of the eyes. The large pos- 

 terior lateral tooth or spine has anterior to it a slight swelling 

 of the margin. In a lateral view of the head, the height in the 

 line of the eyes is much longer than the beak. The beak in this 

 view is slightly emarginate at apex. 



LEUCIPPA L^EVIS. 



Carapax subtriangulatus, Icevis, regione mediand parce tumidd, rostra 

 elonyato, furcato, cornubus triangulatis et triangulate sejunctis, acutis; 

 marginibits carapacis lateralibus pertenuibits, paulo expansis et sub- 

 reflexis, 4:-dentatis (aut angulatd undulatis), dentibus incequis, dente 

 poster lore postice arcuato; margine laterali in superficiem regionis pos- 

 tero-lateralis producto. Regio pterygostomiana 3-dentata (aut instructa 

 uno dente in sinu grandi insito}. Pedes nudi, articulo 3tio cristato. 



Carapax subtriangular smooth, median region sparingly tumid ; beak 

 elongate, furcate, horns triangular, acute, and with a triangular 

 interval ; lateral margins of carapax very thin, and a little reflexed, 

 four-toothed or angulately undulate, the teeth unequal, posterior 

 tooth arcuate behind, and produced upon the postero-lateral surface 

 of the carapax. Pterygostomian region three-toothed, or having a 

 single tooth situated in a large depression. Feet naked, third 

 joint cristate. 



Plate 6, fig. 5 a, male, enlarged two diameters; b, under view; c, 

 part of anterior legs. 



From Rio Janeiro. 



ft 



Length, four and a half lines; greatest breadth, three and a half 

 lines. 



