MAIOIDEA. 123 



thrown forward beneath the beak, so as to be concealed by it, although 

 capable of being spread either side of the beak. Arm of anterior legs 

 with a few small tubercles. 



Mensethius sulserrcttus, ADAMS and WHITE, Crust. Samarang, p. 18, pi. 4, fig. 1. 

 Also fig. 2 ? winch is supposed to represent a female. 



TUBERCULATUS, Leach. 



Maris: Carapax valde tuberculatus posticd latiusculus (latitudine ma- 

 jore lonyitudinem carapacis post-rostralis cequante) ; dentibus lateralibus 

 simplicibus, postico subacuto ; regione mediand posticd uni-tuberculatd ; 

 regione post-medmna obsoletd, regione intestinali uni-tid>ercidatd ; 

 margine postico utrinqm prornimdo ; rostro longo, simplice. Abdomen 

 perangustum, versus basin suborbiculare. Manus oblonga, digitis basin 

 plane hiantibus. 



Male : Carapax very strongly tuberculate, rather broad behind, 

 (breadth equalling length of carapax excluding beak) ; lateral teeth 

 simple, the posterior subacute ; median region with but one tubercle 

 on the posterior part ; postmedial region obsolete ; intestinal region 

 uni-tuberculate; posterior margin of carapax with a small prominence 

 near base of legs. Abdomen very narrow, towards base sub-orbicular. 

 Hand oblong, fingers gaping, in contact only at apex. 



Plate 5, fig. 1 a, animal (male), enlarged three diameters; b, under 

 view, showing antennae, enlarged six diameters ; c, hand. 



Paumotu Islands, Pacific Ocean. 



Length, four lines ; greatest breadth, two and two-thirds lines, which 

 equals the length of post^rostral part of carapax. 



The posterior part of carapax has the appearance of being orbicular 

 in outline, owing to the fact that the sides along the lateral region, 

 situated below the outline of the upper surface of the carapax, are in 

 view when seen from above, as shown in the figure. Third joint of 



