MAIOIDEA. 139 



GENUS CERATOCAKCINUS (Adams and White). 



In the species referred below to this genus, and resembling much 

 that described by Adams and White, we observe the following generic 

 characters : 



Outer antennae free from the first basal joint, and cylindrical, in- 

 serted in a fissure in the under side of the orbit, and arising just ante- 

 rior to the outer anterior angle of the buccal area; second basal joint 

 much longer than first or third. Inner antennae folded in shallow 

 fossettes under the front very obliquely, making nearly an angle of 

 50 with the medial line. Buccal area nearly square. Front trans- 

 verse, without a beak. Praeorbital teeth salient beyond the line of 

 the front. Eyes but little salient ; orbit entire above. Carapax 

 hexagonal in outline, the sides projecting triangulately, and nearly 

 acute at the prominent angle. Abdomen of male seven-jointed. 

 First pair of legs elongate, a little shorter than second ; hand quite 

 long, broadest at the commencement of the fingers. 



CERATOCARCINUS SPECIOSUS. 



Carapax Jiexagonus, fere equilateralis, depressus, regionibus partim con- 

 spicuis, fronte lato, rectd transverso, subtiliter crenulato, medium emar- 

 ginato, utrinque juxta oculum valde saliente. Manus digitusque 

 mobilis spinulosi; carpus parce spinulosus ; digiti contigui. Pedes 

 8 postici breviter pubescentes, inermes. 



Carapax hexagonal, nearly equilateral, depressed, regions partly dis- 

 tinct; front broad, transverse, minutely crenulate and emarginate 

 at middle; prseorbital tooth salient, obtuse. Hand and moveable 

 finger spinulous, carpus sparingly spinulous, fingers contiguous. 

 Eight posterior feet short pubescent, not armed with teeth or 

 spines. 



Plate 6, fig. 8 a, male, enlarged; b, under view of head; c, male 

 abdomen. 



