GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 147 



in a sharp margin ; lower margin very finely and sharply granulate 

 to the finger tip. Outer surface smooth and glossy, thickly covered 

 near the lower margin with fine granules. Inner surface covered 

 with very small, oblong punctae. A stout tooth on the prehensile 

 margin of the immovable finger visible from the outside; another 

 tooth on the movable finger, visible from the inside. 

 Type-locality. — Gatun. Miocene series. 



CALLIANASSA ABBREVIATA, new species. 



Plate 63, figs. 1-6. 



Type-locality. — Panama Canal Zone. Las Cascadas section, Gail- 

 lard Cut. From lowest fossiliferous bed; third bed below lowest 

 limestone beds separated by rows of nodules. Lower part of upper 

 half of Culebra formation. Oligocene series. D. F. MacDonald 

 and T. W. Vaughan, collectors. 1911. Station 6020a, 4 specimens. 



Types.— Cat. No. 324274, U.S.N.M. 



Measurements. — Length of manus to sinus, 10.3 mm. ; greatest 

 height, 10 mm. ; distal height, 8.4 mm. 



Holotype. — Specimen of right manus partially embedded, showing 

 inner surface and half of outer surface; an imprint of the inner sur- 

 face of the holotype is seen on a separate piece of rock. Length and 

 height subequai; infero-proximal angle a right angle, upper margin 

 convex. Outer surface slightly convex from end to end, more so from 

 top to bottom. Inner surface equally convex in both directions, with 

 a furrow close to the proximal end ; an oblique furrow near the lower 

 edge, directed slightly upward distaily, and a depression leading to 

 the sinus between the fingers and to the adjacent part of the immov- 

 able finger ; on the oblique raised line below this depression, there is 

 a row of 4 granules. Upper and lower edges margined; the lower 

 edge shows, in the impression, about 18 dots, but whether these are 

 punctae or spinules on the outer surface can not be told. There is a 

 line of 6 punctae just within the upper margin. A few scattered 

 punctae on inner surface. An oblique cross section of the thumb is 

 small and somewhat diamond-shaped; above this section there is a 

 blunt tooth; sinus between the 2 fingers V-shaped. The impression 

 shows a little more of the length of the thumb than remains in the 

 type, but represents neither the full length nor width. 



Paratype (a). — Left manus, larger than the holotype, and free 

 from the matrix; immovable finger broken off; edges worn; inter- 

 digital tooth present, and near by on the outer surface, a granule. 



Paratype (b). — A fragment, comprising the distal lower end of 

 the propodus with broken finger attached; interdigital tooth present. 



