XANTHODES SULCATUS. 17 



GLYPTOXANTHUS A. 31. Edw. 



Crustaces de la Region Mex., p. 253, 1S79. 



Glyptoxanthus labyrinthicus (Stimps.). 



Actaa labyrinthica Stimps., Aun. Lye. Nat. Hist. N. Y., VII. 204, 1S60. 



Glyptoxanthus labyrinthicus A. M. Edw., Crustaces de la Region Mex., p. 255, Plate XLIII. Fig. 4, 1879. 



One male, from the reef at Panama. 



XANTHODES Dana. 



Proc. Acad. N^t. Sci. Phila., VI. 75, 1852 ; U. S. E.xplor. Exped , Crustacea, Pt. I., pp. 148, 175, 1852. 



Xanthodes sulcatus Fax. 

 Plate III., Fig. 2, 2''. 



Bull. Miis. Comp. Zool., XXIV. 152, 1893. 



The carapace is rather convex from before backward, granulated, the 

 granulation heaviest on the lower surface and near the borders of the upper 

 surface. Deeply impressed grooves separate the gastric from the branchial 

 regions, and the mesogastric lobe ft-om the lateral gastric lobes. The groove 

 which continues in the median line to the front, anteriorly to the meso- 

 gastric lobe, is crossed a short distance behind tlie frontal margin by a trans- 

 verse groove which meets on either side another groove running parallel to 

 the upper margin of the orbit. In this way there are marked off a pair of 

 frontal and a pair of orbital areolets. The frontal margin is nearly straight, 

 finely denticulated and separated from the orbital areolets by a groove. The 

 margins of the orbit are also minutely denticulate, and there is a broadly 

 open, triangular notch at the external orbital angle. The antero-lateral 

 border of the carapace is armed with four spines or teeth, ENTS of Dana's 

 nomenclature, there being no tooth at the outer angle of the orbit; of these 

 teeth, the first is the smallest, the third the largest, and the second and 

 fourth are of about equal size ; the edges of all the teeth are denticulate. 

 The lower margin of the orbit is produced into a prominent tooth at the 

 inner angle. The basal joint of tlie antenna barely meets, by the inner 

 angle of its distal end, a descending process of the frontal margin, and the 

 next joint lies in, but does not nearly fill, the hiatus at the inner orbital 

 angle. The merus of the outer maxillipeds is granulated like the under 

 parts of the carapace. The chelipeds are short and unsymmetrical ; the 



