/ 



XANTHODES SULCATUS 



17 



GLYPTOXANTHUS A. M. Edw. 



Cruytaces clc la llegiou Mex.J p, 253, 1879. 



Glyptoxanthus labyrinthicus (Sttmps.). 



Act(r.a lahjrmtldca Stimps., Ann. Lye. Nat. Hist. N. Y., VII. 204, I860. 



Gl>j])toxanthMS lahyrinlMcus A. M. Edw., Crustaces de la Eegion Mex., p. 255, Plate XLIII. Pig. 4, 1879 



One male, from the reef at Panama. 



XANTHODES Dana. 



Proc. Acad. Nat. Sci. Pliila., VI. 75, 1852 ; U. S. Explor. Exped,, Crustacea, Pt. I., pp. 148, 175, 1852. 



Xanthodes sulcatus Eax. 

 Plate IIL, Fig. 2, ^^ 



Bull. Mus. Comp. ZooL, XXIV. 152, 1893. 



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

 granulation heaviest on the lower sm-flice and near the borders of the upper 

 surface. Deeply impressed grooves separate the gastric from the branchial 

 reo-ions and the mesogastric lobe from the lateral gastric lobes. The groove 



open 



triangular notch at the external orbital angle. 



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

 i^astric lobe, is crossed a short distance behind the frontal margin by a trans- 

 verse o-roove 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 denticidated and separated from the orbital areolets by a groove. The 

 marj^-ins of the orbit are also minutely denticulate, and there is a broadly 



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 the antenna barely meets, by the inner 

 ant'-le 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 

 ant>-le. The merus of the outer maxillipeds is granulated like the under 

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



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