GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 145 



CALLIANASSA QUADRATA, new species. 



Plate 62, figs. 4-14. 



CalUanassa scotti Brown and Pilsbey (part), Proc. Acad. Nat. Sci. Phila., 

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



Eepresented by 2 specimens of the left maims from which the 

 propodal finger has been broken off. The smaller one is used as 

 the type, as it is the better preserved. 



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 6020«. Holotype 

 and paratype. Cat. No. 324275, U.S.N.M. 



Measurements (in mm.). — 



Holotype. Paratype. 



Height of manus near middle 13. 3 15. 3 



Length of manus measured to sinus 12. 8 15. 7 



Thickness of manus 6. 2 7. 5 



Holotype. — Hand squarish, with the corners rounded off. The 

 upper and lower margins are subparallel, the upper slightly arched, 

 the lower with a shallow distal sinus. Distal margin, at the articula- 

 tion with the dactylus, nearly vertical. Outer surface slightly con- 

 vex in a longitudinal direction, strongly convex vertically, furrowed 

 at the distal end across the middle third; inner surface moderately 

 convex except at the distal and lower portions, where it is concave; 

 there is a groove just above the lower margin which widens as it ap- 

 proaches the finger. Lower margin serrulate ; upper margin bluntly 

 angled except in the distal third, where it is rounded; just within 

 this margin there is a row of sockets of which 3 can be made out. 

 On the outer surface near the sinus between the fingers there is a 

 tubercle and near the carpus 3 granules far apart in a vertical row 7 ; 

 on the inner surface there is a row of granules, running almost longi- 

 tudinally near the middle and thence downwards toward the sulcus 

 between the fingers; 2 tubercles near the articulation with the dac- 

 tylus. Propodal finger narrow, much compressed, subtriangular at 

 the base in cross section, with the small end of the triangle down. 

 Base of dactylus very large. 



Paratype (a).— Larger than the type; upper margin straighter; 

 the tubercle on the outer surface near the sinus is of good size; on 

 the inner surface near the middle there are numerous granules instead 

 of the single row in the holotype ; 2 tubercles near the dactylus. 



Doubtful specimen. — A single specimen of a left carpus, from the 

 same locality as the types may belong to the same species. The 

 inner surface is mostly concealed by the matrix. Outer surface 



