XANTHODES SULCATUS. ily) 
GLYPTOXANTHUS A. M. Epvw. 
Crustacés de la Région Mex., p. 253, 1879. 
Glyptoxanthus labyrinthicus (Srmrs.). 
Actea labyrinthica Stimes., Ann. Lyc. Nat. Hist. N. Y., VII. 204, 1860. 
Glyptoxanthus labyrinthicus A. M. Epw., Crustacés de la Région Mex., p. 255, Plate XLII. Fig. 4, 1879. 
One male, from the reef at Panama. 
XANTHODES Dana. 
Proc. Acad. Nat. Sci. Phila., VI. 75, 1852; U.S. Explor. Exped , Crustacea, Pt. I., pp. 148, 175, 1852. 
Xanthodes sulcatus Fax. 
Plate LII., Fig. 2, 2. 
Bull. Mus. Comp. Zodl., 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 from 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 the 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 the 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 
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