M A I ID E A. 



139 



Genus CERATOCARCINUS (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 7iexagonus, fere equilate raits, depressus, regionibus partim con- 

 spicuis, f route lato, recte transverso, subtiliter cremdato, medium emar- 

 ginato, utrinque juxta oculum valcle salients. Manus digitusque 

 mobilis spinulosi; carpus parce spinulosus ; digiti contigui. Pedes 

 8 posthi breviter pubescentes, inermes. 



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

 tinct ; front broad, transverse, minutely crenulate and emarginate 

 at middle; praaorbital 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, Hg. 8 a, male, enlarged; 6, under view of head; c, male 

 abdomen. 



