GEOLOGY AND PALEONTOLOGY OP THE CANAL ZONE. 171 



The larger claw of this species is strikingly like that described by 

 A. Milne Edwards 1 under the name Scylla michelini from Sceaux, 

 near Doue, France, in the Miocene shell deposits of the shell-marl 

 of Anjou. M. Milne Edwards founded the species on the claw alone. 

 It is very likely congeneric if not conspecific with the form here 

 described. ♦ 



Family XANTHIDAE. 



CARPILIUS, species. 



Plate 58, fig. 22. 



Locality. — Panama Canal Zone. Foraminiferal marl and coarse 

 sandstone about 200 yards south of southern end of switch at Bohio 

 Ridge station, relocated line Panama Railroad. Upper part of 

 Culebra formation. Oligocene series. D. F. MacDonald and T. W. 

 Vaughan, collectors. 1911. Station 6025. Cat. No. 324243, U.S.N.M. 



Material. — Piece of propodal segment of ambulatory leg on left 

 side of crab. Length 17 mm., greatest width 7.2 mm., least width 

 5.7 mm., proximal thickness 4.5 mm., distal thickness 3.7 mm. Viewed 

 dorsally, the anterior margin is slightly convex, the posterior faintly 

 concave. Viewed edgeways, the upper surface is longitudinally con- 

 vex, and the lower surface concave. Cross section oval. Surface, 

 except for accidental breaks, smoothly rounded, without ridges, 

 furrows, or tubercles. 



In its smoothness and general form, resembles the propodus of the 

 first ambulatory leg of Oarpilius corallinus (Herbst 2 ), for which 

 reason I venture to attach the name Carpilius to this fragment. 



HETERACTAEA LUNATA (Milne Edwards and Lucas). 



Plate 63, figs. 7-9. 



Pilumnus lunatus Milne Edwaeds and Ltjcas, d'Orbigny's Voy. Aroer. Mer.. 

 vol. 6, 1843, p. 20 ; vol. 9, atlas, 1847, pi. 9, fig. 2. 



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

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

 Cat. No. 324265, U.S.N.M. 



Distribution. — Recent, San Diego, California, to Chile. 



Material. — One specimen showing distal portion of outer surface 

 of larger palm, with proximal half of dactylus (showing all sur- 

 faces) attached. This must have belonged to a small individual 

 with carapace about 15 mm. wide. The fossil is crushed and the 

 tips of the tubercles are lacking. The shape of the two segments so 



1 Histoire des CrustacSs podophthalmaires fossiles, Paris, 1861, p. 136, pi. 3, figs. 3, 3A. 

 2 Naturg. d. Krabben u. Krebse, vol. 1, 1783, p. 133, pi. 5, fig. 40. 



8370°— 18— Bull. 103 12 



