138 BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



near the base. The merus appears to be about twice as long as high 

 and is dilated at the middle. 



Measurements. Length of carpus and propodus, measured from 

 lowest point of articulation with merus to end of propodal ringer, 

 20.5 mm.; proximal width of propodus (approx.), 9.4 mm.: greatest 

 width of same, 10 mm. ; distal width of same, 8.7 mm. ; superior 

 length of same, 10.2 mm. ; inferior length of same, 13.2 mm. ; length 

 of propodal finger measured on cutting edge. 5.7 mm.; length of 

 dactylus, 5.7 mm. 



Paratype. (a) Left manus with part of the fixed finger, em- 

 bedded in a nodule and exposing the outer surface. Larger than 

 holotype. The lower margin of the manus has blunt serrations 

 resembling the stumps of spines; above the margin is a row of five 

 distant punctae; at the distal end there are two rows of granules 

 leading toward the upper part of the fixed finger. 



Paratype. (b) Carpus of left cheliped embedded in a nodule and 

 imprint of same, showing the distal and upper margins and a large 

 part of the outer surface. The distal margin is oblique and concave 

 and has a little rounded lobe at each end ; the upper margin is arcuate 

 and has a submarginal groove. 



CALLIANASSA LACUNOSA, new gpecies. 

 Plate 59. lijrs. 6-11. 



Type-locality. One-quarter mile south of Empire Bridge, Canal 

 Zone, Panama; from lower dark clay beneath lower conglomerate. 

 Lower part of Culebra formation. Oligocene series. D. F. Mac- 

 Donald and T. W. Vaughan, collectors. 1911. Station 60120, Two 

 specimens, each a left propodus of the first cheliped. Cat. No. 

 324278, U.S.N.M. 



Holotype. The palmar portion of a propodus, the fixed finger 

 broken off near its base ; the propodus is incomplete near the dactylus 

 and also at the proximal end; this end is, however, fairly complete 

 on the inner surface, so that the measurements may be stated with 

 approximate accuracy. Length, at the level of the sinus between 

 the fingers, 16 mm. ; greatest height, 15.6 mm. ; least height, 15.2 mm. ; 

 thickness, 6.6 mm. The upper margin is a little arched, the lower 

 nearly straight; they converge a little distally; they are very thin; 

 the top of this thin edge along the upper margin is set with oblong 

 tubercles, dorsal in position; the lower edge is smooth. The outer 

 surface has a row of 6 pits a little above the edge and fairly evenly 

 spaced ; they have a raised edge and are distally inclined, indicating 

 that they were sockets for hairs or bristles; 3 similar pits far apart 

 are close up under the upper margin; of the few scattered pits, 3 

 form a triangle at the distal end, the one near the base of the fixed 



