GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 177 



of chelipeds or legs ; the nodule is very little wider than the carapace. 

 Cat. No. 324228, U.S.N.M. 



Family GECARCINIDAE. 



CARDISOMA GUANHUMI Latreille. 



Plate 64, figs. 2-4. 



Cardisoma guanhumi Latreille, Encyc. Meth., Hist. Nat., Insectes, vol. 10, 

 1825, p. 685. 



Locality. — Costa Rica : City of Port Limon. Port Limon forma- 

 tion. Pliocene series. Dr. L. A. Wailes, collector. Station 4269. 

 Cat. No. 324263, U.S.N.M. 



Material. — Left propodal finger of cheliped, with extremities lack- 

 ing; length 18.5 mm. Pieces of the outer crust remain along the pre- 

 hensile teeth, around the distal end, and on the lower part of the 

 proximal end, where it shows the characteristic scaly granulation of 

 the species. 



Distribution of Recent Material. — From Bahamas and Florida 

 Keys to Brazil ; Bermudas. 



Family OCYPODIDAE. 



UCA MACRODACTYLUS (Milne Edwards and Lucas) . 



Plate 64, fig. 7. 



Gelasimus macro dactylus Milne Edwards and Lucas, d'Orbigny's Voy. 

 Amer. Mer., vol. 6, 1843, p. 27 ; vol. 9, atlas, 1847, pi. 11, fig. 3. 



Locality. — Panama Canal Zone. From near Mount Hope in ditch 

 through swampy ground. About one-quarter mile from present sea 

 beach, 6 to 8 feet above high tide. Pleistocene series. D. F. Mac- 

 Donald, collector. April, 1911. Station 5850. Cat. No. 324251, 

 U.S.N.M. 



Material. — A single dactylus, 6.7 mm. long, of an ambulatory leg 

 corresponds with that of a recent specimen from Costa Rica. The 

 dactylus is rather slender, regularly tapering and strongly curved 

 on its concave as well as on its convex margin, it has 6 longitudinal 

 grooves separated by as many smooth rounded ridges; toward the 

 horny tip these ridges are themselves guttered by a narrow groove. 



Distribution of Recent Material. — From Guaymas, Mexico, to Val- 

 paraiso, Chile. 



BRACHYRHYNCHA, family, genus, and species indeterminable. 



Plate 64, fig. 6. 



Locality. — Panama Canal Zone. Las Cascadas section, Gaillard 

 Cut. From lowest fossiliferous bed. Third bed below lowest lime- 



