SPIDER CRABS. RATHBUN. 5 



Measurements. Male ho lo type, length of carapace to tip of 

 horns 48, length to base of rostral sinus 40.5, width of carapace 

 exclusive of spines. 44. length of lateral gastric spines 18.3 mm. 



Diagnosis. No spine on upper margin of orbit. No spine 

 between largest gastric spine and largest branchial spine. 

 Palm of male three times as wide at distal as at proximal end, 



Description. Carapace very finely roughened with sharp 

 granules. Three gastric spines, the lateral spines being very 

 long, slender, sub-parallel, and in a plane almost at right 

 angles to that of the cardiac spines ; median gastric spine 

 further back than the lateral pair and very much smaller. 

 Two cardiac spines side by side, shorter than the median 

 gastric spine. Two dorsal branchial spines (paired) the 

 posterior and smaller almost in line with the cardiac spines, 

 the anterior spine lower down and almost in line with the 

 median gastric spine. Besides there is a marginal line of small 

 spines which is continued on the pterygostomian region, and a 

 short, parallel, submarginal row of similar spines at the widest 

 part of the carapace. Two marginal hepatic spines (paired), 

 the anterior of good length, the posterior small. Rostral 

 horns slender, moderately divergent, about twice as long as 

 the interantennular spine. 



A large tubercle on the upper surface of the eyestalk at its 

 extremity. 



Basal antennal segment armed with four spines ; the 

 stoutest is at the antero-external angle, points forward and 

 has a spinule near its posterior base ; the others point down- 

 ward and outward, the second spine on the ventral surface 

 near the inner margin, the other two on the outer margin. 



Fig. 1. ( '//rlomaia rnaccutluchi, liath- 

 lum, basal segment of left antenna of 

 male (E 36^;>). outer view, five and one- 

 third times natural size. 



