150 BULLETIN" 103, UNITED STATES NATIONAL MUSEUM. 



leading to the gape there is a double row of granules, 8 of which 

 can be made out. The edge overlapping the dactylus is crenulate on 

 the inner surface. 



Paratype (). Portion of left propodus showing part of finger 

 and a small part of the manus. Surface shining. Three tubercles 

 near gape, and continuing the same curve along the upper part of the 

 outer surface of the finger, there is a granule followed by 2 sockets. 



Measurements. (Approximate only.) Holotype: Distal height 

 of manus, 19.3 mm. ; length of dactylus from tip to proximal end of 

 upper margin, 23.5 mm.; height of dactylus, measured straight up 

 from the edge of the basal tooth, 8.6 mm.; length of immovable 

 finger measured along the prehensile edge, 15 mm. ; height of same 

 at base, 7 mm. Paratype (a) : Length of manus across middle, 19.5 

 mm. ; proximal height, 16.7 mm. ; distal height, 15 mm. ; greatest 

 thickness, 6.6 mm. Paratype (&) : Height of immovable finger at 

 base, 5.8 mm. 



Additional localities. Panama Canal Zone. Las Cascadas sec- 

 tion. From lower part of lime-cemented soft gray to olive -colored 

 limestone with central parting of dark clay. The first hard, limy 

 sandstone bed above the lower limestone just above Station 60195. 

 Upper part of Culebra formation. Oligocene series. D. F. Mac- 

 Donald and T. W. Vaughan, collectors. 1911. Station 6019c. One 

 left propodus with most of the fixed finger attached. The specimen 

 is so bruised and crushed that its identity can not be determined with 

 certainty. Cat. No. 324283, U.S.N.M. 



Also, from the same place, a right dactylus from a cheliped of 

 much smaller size. Its identity is uncertain. It lacks the large teeth 

 on the cutting edge, but it may belong to the feebler of the two 

 chelipeds, or to a female. There is evidently a shallow sinus at the 

 base, followed by a low broad tooth. Six sockets for setae can be 

 made out. The thick outer crust has nearly all broken away. Cat. 

 No. 324283, U.S.N.M. 



Panama Canal Zone. From lowest horizon in big cut from to % 

 mile beyond Camp Cotton toward Monte Lirio. Lower part of 

 Gatun formation. Miocene series. D. F. MacDonald and T. W. 

 Vaughan, collectors. 1911. Station 6029a. Left manus, about 9.6 

 mm. long, measured at the level of the articulating condyle of the 

 dactylus; edges mostly broken and obscured. Identification based 

 (1) on the general contour of the surface, (2) the color, a light drab, 

 (3) the margin adjacent to the articulating condyle of the dactylus, 

 and (4) 2 sockets just below the upper margin on the inner surface. 

 Cat. No. 324284, U.S.N.M. 



