GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 165 



and T. W. Vaughan, collectors. 1911. Station 6012c. Cat. No. 

 324268, U.S.N.M. 



The distal third of the immovable finger of a claw of a Callinectes- 

 On the prehensile edge is shown the most distal of the large teeth 

 customary in the genus followed (toward the tip) by 3 smaller teeth: 

 the tip is defective, having been broken off, then reattached in the 

 wrong place. There is a punctated groove down the middle of the 

 inner and the outer surface. 



Of the species of Callinectes living on the Pacific coast of America r 

 this fragment resembles most C. toxotes Ordway, 1 which occurs from 

 Cape St. Lucas to Peru. 



ARENAEUS, species. 



Plate 64, fig. 1. 



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. 324252, 

 U.S.N.M. 



Material. Five fingers worn and more or less incomplete. Prob- 

 ably all are movable fingers or dactyli. Length of most perfect 

 specimen. 8.2 mm. On the outer surface there are two grooves dotted 

 with minute punctae; one is shallow and near the prehensile teeth, 

 the other is above the middle of the segment; on the upper surface 

 there are also two punctated grooves, but near together, while the 

 inner surface has two furrows similar to those of the outer surface. 

 Three or four of the prehensile teeth are enlarged as is usual in 

 Portunids, and the tip is curved downward. There are evidences of 

 close granulation on the uppermost ridges and on the proximal part 

 of the segment. 



This is near A. mexicanus (Gerstaecker 2 ), a Recent species which 

 occurs from the west coast of Mexico to Peru. The shape, curvature, 

 tmd granulation are similar, but three of the six grooves belong defi- 

 nitely to the outer surface. 



EUPHYLAX CALLINECTIAS, new gpecies. 



Plate 65, figs. 3-6. 



Type-locality. Banana River. Costa Rica ; ninth f ossilif erous zone 

 below the uppermost one of the section. Probably equivalent to Gatun 

 formation. Miocene series. D. F. MacDonald, collector. 1911. 

 Station 5882?; U. Cat. No. 324234, U.S.N.M. 



1 Boston Joura. Nat. Hist., vol. 7, 1863, p. 576. 



2 Euctenota mexicana Gorstaeeker, Arch, fiir Naturg., vol. 22, pt. 1, 1856, p. 131, pi. 5, 

 figs. 3 and 4. 



