140 BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



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

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



Holotype.Csit. No. 324271, U.S.N.M. A left manus, with base 

 of immovable finger attached; this shows all of the outer surface, 

 except the margin bordering the dactylus; nearly the whole of the 

 inner surface is concealed by the matrix. The upper margin is nearly 

 straight throughout its length, and is bluntly angled ; lower margin 

 very sinuous, the manus being very much deeper in its proximal 

 than its distal half, edge serrulate or spinulous throughout its length ; 

 proximal edge vertical, nearly as long as upper margin. On the 

 outer surface there is a group of granules at the distal two-sevenths 

 and just below the middle; there is a curved row of granules near 

 the sinus, which is continued upon the propodal finger near its upper 

 edge; 6 granules in all are visible. Finger very slender, inclined 

 downward. The dactylus must have been very stout, and the adja- 

 cent edge of the manus very oblique, but it is now incomplete. 



Measurements. Superior length of manus (approx.), 15.7 mm.; 

 length to sinus, 20.4 mm. ; greatest height, 16.2 mm. : proximal height 

 (approx.), 15.1 mm.; distal height, 12.4 mm. 



CALLIANASSA SCOTTI Brown and Pilsbry. 



Plate 60, figs. 9-12. 



Callianassa scotti BROWN and PILSBRY (part), Proc. Acad. Nat. Sri. Phil;)., 

 vol. 64, 1913, p. 503, pi. 22, figs. 1 and 3 (not fig. 2). 



Locality. Panama Canal Zone. From the 4 feet of dark strati- 

 fied tuff and clay immediately overlying the lower limestone bed. 

 Las Cascadas section. Upper part of Culebra formation. Oligo- 

 cene series. D. F. MacDonald and T. W. Vaughan, collectors. 1911. 

 Station 60195. Cat. No. 324279, U.S.N.M. 



Material. A left manus, removed from the matrix, and incom- 

 plete at the proximal end. Outer surface very convex from upper to 

 lower margin; upper margin straight, with a blunt marginal line: 

 lower edge acute and serrulate with fine appressed teeth or spines, 

 inclined upward toward the base of the finger, then downward: 

 three granules or tubercles in a curved row just outside the edge of 

 the sinus between the fingers. The cross section of the finger near 

 its base is very small, in relation to the manus. Inner surface 

 slightly convex, from upper to lower edge, and with a depression on 

 either side of the base of the fixed finger; numerous granules near 

 the distal end, some arranged in a curved band between the two 

 fingers. 



Measurements. Greatest height of manus, 25.2 mm. ; least height 

 of same, 23.3 mm. ; length of same to digital sinus, 24.6 mm. ; thickness 



