176 GEOLOGY AND PALEONTOLOGY OF THE WEST INDIES. 



face of the palm. There is the base only of a good-sized spine at terminal end 

 of upper margin of manus. On the outer face of the dactylus at the articula- 

 tion there is a small, black, horny, outstanding knob. Prehensile edges of 

 fingers furnished with very unequal, stout, rounded teeth with dark brown, 

 horny caps. Tips of fingers acute. 



Relationships. The carapace of this species is considerably like that 

 of P. vigil (Fabricius), 1 which to-day inhabits the East Indian region 

 and is found also in the post-Tertiary of Celebes, but in the latter the 

 anterior margin is arched, the antero-lateral spine projects strongly 

 sideways, and the chelae are not externally flattened. The smooth, 

 flattened fingers of P. domingensis are suggestive of Euphylax dovii, 2 

 the podophthalmid which inhabits the west coast of tropical America. 

 I have placed the new species in Podophthalmus rather than in Euphy- 

 lax, by reason of the shape and distinct areolation of the carapace and 

 the strong lateral spines. 



Family XANTHID^E. 



Genus ZANTHOPSIS M'Coy, 1849. 

 Zanthopsis bartholomseensis, new species. 



(Plate 8, Figure 3.) 



Material. Represented by a single carapace, the margin of which 

 is largely incomplete. 



Holotype.C&t. No. 166945, U. S. N. M. 



Type locality. St. Bartholomew: Orient Point; picked up at base, 

 but probably from limestone at top, of the section; Eocene; T. W. 

 Vaughan, collector; February 21, 1914; 6915; L. I. 72 (c) (1914). 



The following is a description of this species : 



Carapace approximately one-fifth wider than long, posterior half fairly 

 level, anterior half curving strongly downward toward the front and antero- 

 lateral margins. Mesogastric, protogastric, and cardiac regions well delimited. 

 The mesogastric region becomes suddenly wide behind the narrow anterior 

 part; this broad posterior pentagonal portion is elevated and smoothly 

 rounded; on each protogastric region there is a pair of tubercles forming a 

 transverse line of 4; in front of the inner tubercle of each pair, but a little 

 further from the median line, there is another tubercle; the cardiac region is 

 covered by an elevation smaller than that on the mesogastric region but 

 similar, that is, its anterior slope is shorter and steeper than its posterior. 

 The most conspicuous elevation is that on the branchial region at the widest 

 part of the carapace; it consists of two large transverse tubercles placed one 

 directly behind the other, or rather resembles a single elevation deeply 

 bisected transversely; there is a low swelling on the branchial region opposite 

 the gastro-cardiac suture. So far as can be made out, the antero-lateral 

 margin is unarmed. Postero-lateral margins strongly convergent. Along 

 these margins just behind the lateral angle there is a curved row of 3 upstand- 

 ing tubercles; further back there is a lower, smaller tubercle, and between 

 it and the posterior of the large tubercles there is still another, but minute, 

 tubercle. 



1 Portunus vigil Fabricius, Entom. Syst,, Suppl., p. 363, 1798. Podophthalmus vigil Leach, Zool. 



Misc., vol. 2, p. 149, plate 118, 1815. 



2 Stimpson, Ann. Lye. Nat. Hist. N. Y., vol. 7. p. 226, plate 5, fig. 5, 1860. 



