352 



BUIvLETIN 129, UNITED STATES NATIONAL. MUSEUM 



Description after Bell and Nohili. — Carapace rounded behind, 

 depressed, covered with low tuberosities; lateral margin without 

 teeth, perpendicular. Rostrum minute, tapering to the point, 

 which is slightly divided. Basal antennal joint with but one anterior 

 tooth or lobe (according to Bell's figure 4 Ic) and that at the outer 

 angle. 



Chelipeds in the male longer and much more robust than the 

 ambulatory legs. The arm has two series of quadrilateral excava- 

 tions on the upper and outer surfaces, diminishing backwards. 

 Hands tumid, convex inwardly and outwardly, smooth, carinated 

 beneath, fingers meeting only at point, notably arcuate and leaving a 

 large interspace except at tips, edge not excavated nor serrated, but 

 with a single bifid tubercle near the middle of the movable finger. 

 Legs flattened above, longitudinally rugose, the sides furnished with 

 rather long hairs. 



Color. — Light yellowish brown above, paler beneath (Bell). 



Measurements. — Length of carapace of type-specimen 13.5 mm. 

 (6 lines), width of same 11.3 mm. (5 lines). 



Range. — Galapagos Islands, 7 fathoms, sandy mud (Bell) ; Bay of 

 Santa Elena, Ecuador (Nobili). 



Fig. 114— Thoe aspera, male (23773), total length of carapace 10 mm. (After Rathbun.) a. Cara 



PACE, DORSAL VIEW. 6. MeRUS OF A RIGHT AMBULATORY LEG 

 THOE ASPERA Rathbun 



Plate 124, figs. 4 and 5 



Thoe aspera Rathbun, Bull. U. S. Fish Comm., vol. 20, for 1900, pt. 2, 

 1901, p. 63, text-fig. 10 (type-locality, Ensenada Honda, Culebra; holo- 

 type. Cat. No. 23773, U.S.N.M.). 



Diagnosis. — Carapace armed with some sharp spines and tubercles. 

 Rostral horns separated by a large V. Basal antennal joint much 

 longer than broad. Merus of legs moderately dilated. 



