GEOLOGY AND PALEONTOLOGY OP THE CANAL ZONE. 155 



I have placed this specimen in Goniochele 1 on account of the 

 dactylus being armed on both edges, as in G. angulata Bell, 2 the 

 type of the genus, and because the general shape of the segment is 

 similar. In Bell's species the dorsal surface is smooth. 



Sub tribe OXYSTOMATA. 

 Family CALAPPIDAE. 



HEPATUS CHILIENSIS Milne Edwards. 



Plate 66. fig. 4. 

 Eepatus chiliensis Milne Edwaeds, Hist. Nat. Crust., vol. 2, 1837, p. 117. 



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. 324235, 

 U.S.N.M. ' 



Material. — Dactylus of right chela, 5.3 mm. long. This little 

 specimen shows all the essential characters of recent individuals of 

 this species : 8 shallow rounded teeth on the lower margin ; a row of 

 5 tubercles on the proximal part of the upper margin and a row of 

 4 tubercles just below and on the outer surface; still further down, 

 2 more tubercles; a stridulating ridge on the inner surface just 

 below the upper edge is formed of upwards of 45 fine parallel striae 

 and occupies the greater part of the length of the finger. 



Distribution of Recent material. — Eanges at the present time from 

 Ecuador to Chile. 



HEPATUS, species. 



Plate 66. fig. 12. 



Locality. — Panama Canal Zone. From lower part of lime-cemented 

 soft gray to olive-colored sandstone (with central parting of dark 

 clay). The first hard limy sandstone bed above the lower lime- 

 stone just above fossil lot No. 60195. Upper part of Culebra forma- 

 tion. Oligocene series. D. F. MacDonald and T. W. Vaughan, 

 collectors, 1911. Station 6019c. Cat. No. 324239, U.S.N.M. 



Material.- — One dactylus of left chela, much worn and incom- 

 plete at both extremities; the proximal half of the upper margin is 

 also wanting. The curves in side view are much like those of 

 H. chiliensis Milne Edwards. 3 Both inner and outer surfaces are 



1 A Monograph of the Fossil Malacostraeous Crustacea of Great Britain, pt. 1, 1857, 

 V- 25. 



2 Idem, pi. 4, fig. 6. 



3 Hist. Nat. Crust., vol. 2, 1837, p. 117. 



8370°— 18— Bull. 103 11 



