S. I. Smith on American Crustacea. 165 



vol. vii, p. 58), it differs in the appioximation of the external maxilli- 

 peds and in the form of the carapax. 



Glyptoplax pugnax, sp. nov. 



Male. The dorsal surface of the carapax is slightly convex longi- 

 tudinally, but not at all transversely, and is thickly granulous. The 

 mesogastric lobe is not distinct from the metagastric, but is well sep- 

 arated li-om the protogastric, and its anterior portion is narrow and 

 extends well forward. The protogastric lol)es are prominent and un- 

 divided, and are not distinctly separated from the epigastric, which 

 are very slight elevations separated by a marked median sulcus. The 

 hepatic region is prominent, undivided, and separated from the gastric 

 and branchial regions by deep sulci. The mesobranchial and meta- 

 branchial lobes are separated by a very slight sulcus, and the anterior 

 portion of the branchial region is divided into three lobules, — one at 

 the base of the epibranchial tooth, a larger one just within this, and 

 a small, indistinct one next the gastro-cardiac sulcus. The front is 

 thin and horizontal, its edge is slightly convex, as seen from above, 

 and divided by a very slight notch in the middle. At each side of 

 the front, there is a deep antennal notch, above which, the inner angle 

 of the sujjerior orbital border projects as a prominent tooth. The 

 superior margin of the orbit is divided by two deep notches. The 

 anterolateral margins are arcuate. The outer angle of the orbit pro- 

 jects only slightly beyond the second tooth and is separated from it 

 by a slight sinus. The remaining portion of the margin is divided 

 into three, prominent, triangular teeth, of which the middle one, or 

 epibranchial, is most prominent. 



The ocular peduncles are armed with a granulous tubercle on the 

 anterior side near the cornea. 



The chelipeds are slightly unequal and the hands are very large. 

 The merus does not project beyond the lateral margin of the carapax. 

 The carpus is short and the outer surface is granulous, has a slight 

 groove along the margin next the propodus, a tooth upon the inner 

 margin, and a small tubercle near the articulation of the propodus. 

 The hand is compressed, very broad, and nearly smooth. The basal 

 portion of the propodus is slightly convex on both sides, the lower 

 edge is rounded, and the upper edge is slightly crested ; the digital 

 portion is very broad at base and very much deflexed, so that the pre- 

 hensile edge is parallel with the margin at the base of the dactylus, 

 the inferior edge is slightly margined on the outside, and the tip is 

 slender and upturned. The dactylus is long and slender, the upper 



