﻿GEOLOGY A]SrD PALEONTOLOGY OF THE CANAL ZONE. 149 



beyond Camp Cotton toward Monte Lirio. Gatun formation. 

 Miocene series. D. F. MacDonald and T. W. Yaughan, 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 dactjlus 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 abruptl}^ 

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

 as basal v>ddth. The ends of the fingers are somewhat crushed ; the 

 movable finger curves stronglj^ 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 the 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 S 

 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 



