GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 149 



beyond Camp Cotton toward Monte Lirio. Gatun formation. 

 Miocene series. D. F. MacDonald and T. W. Vaughan. collectors. 

 1911. Station 6030. Holotype and 2 paratypes. Cat. No. 324285, 

 U.S.N.M. 



Holotype. Portion of the right claw, comprising the distal end of 

 the manus and both fingers ; outer surface only. Height of manus at 

 distal end equal to length of dactylus measured on the chord from the 

 tip to the middle of its articulating edge; surface convex from upper 

 to lower edge. Fixed finger wide in its proximal half, then abruptly 

 narrowed ; distal half directed slightly upward ; length twice as great 

 as basal width. The ends of the fingers are somewhat crushed; the 

 movable finger curves strongly downward and appears to overreach 

 the tip of the immovable finger, being at right angles to it ; its lower 

 edge has two teeth, one near the articulation squarish, broader than 

 long, the other smaller, separated by a rounded sinus. At the sinus 

 distal to this tooth is the widest interdigital gape: a little further on 

 the fingers would meet for a ways, if they were closed, while liie tips 

 would cross each other. The greatest width of the dactylus is a little 

 more than a third of its greatest length, measured in a straight line. 



The oblique edge of the propodus which projects over the dactylus 

 is crenulate. On the manus near the gape of the fingers there are 3 

 tubercles in a curve parallel with the edge. Behind the crenulation 

 there are 2 scale-like sockets from which setae probably arose, and 

 behind these a vertical thumb-nail impression. Near the supero- 

 distal angle of the manus there is another socket. On the proximal 

 half of the dactylus there are 9 sockets of larger size than those on 

 the manus and irregularly disposed; 2 are on the larger prehensile 

 tooth and one on the smaller. 



Paratype (a). Left manus. both sides visible. A smaller speci- 

 men than the holotype. Upper and lower margins distally converg- 

 ing. Length a little more than greatest width. Outer surface con- 

 vex in both directions, but more so from top to bottom. Surface for 

 the most part smooth and shining. The ornamentation is like that 

 of the type, that is, a crenulated edge on the lobe which overlaps the 

 dactylus, a row of tubercles just behind the gape the lower of the 

 3 tubercles is broken off above this 2 sockets, and then a very short 

 thumb-nail impression, followed by a socket near the upper angle. 

 The upper margin is subacute in its proximal half, becoming gradu- 

 ally blunt toward the distal end; on either side is a row of sockets; 

 3 are visible on the outer surface and 5 on the inner; lower margin 

 sharp, also with a row of sockets on either side; 5 are visible on the 

 outer side and about 10 on the inner side in the distal half; the 

 proximal half is broken. There are a few punctae scattered about 

 the outer surface; while on the inner surface near the depression 



