152 BULLETIN" 103, UNITED STATES NATIONAL MUSEUM. 



CALLIANASSA CRASSA, new species. 



Plate 61, figs. 1-3. 



Type-locality. — Gatun section A, bed A (bottom of section). 

 Lower part of Gatun formation. Miocene series. D. F. Mac- 

 Donald, collector. Station 6003. Two dactyli of the left cheliped. 



Types.— Cat. No. 324276, U.S.N.M. 



Measurements. — Length of dactylus, 16.3 mm. ; height, 6.2 mm. 



Hole-type. — Outer and upper surfaces exposed, outline of tip ob- 

 scure. Viewed from the outside the upper outline is arcuate and the 

 tip bent down below the prehensile edge, which is nearly horizontal. 

 Viewed from above, the outer line is much curved and the inner line 

 nearly straight. On the prehensile edge there is a shallow basal 

 sinus, followed by a very low, broad tooth; rest of margin faintly 

 sinuous. The surface shows a number of granules, some large, others 

 small; the large ones are about 7 on the outer surface and 5 on the 

 upper surface; of the former, 2 are submarginal, one of them being 

 above the lobe, the other half way to the tip; the other 5 external 

 granules are disposed on the distal half; the 5 superior granules are 

 arranged in 2 rows, one row of 3 toward the inner surface, and the 

 other row -of 2 granules toward the outer surface ; the proximal of 

 these is double. On the middle of the outer surface there is a patch 

 of about 50 small granules. The chalky-white outer layer of the shell 

 has crumbled away except near the edges, so that one can not tell 

 whether the granules were apparent on that surface. Color of sur- 

 face now exposed dull light bluish. 



Paratype. — About two-thirds as large as the holotype, and with 

 both ends of the finger missing. Granules as follows: 3 large above 

 the lower margin, 2 as in the holotype, the other above the basal 

 sinus; on the inner surface are 3 similarly spaced but placed more 

 distad. On the upper surface there is a row of 4 toward the inner 

 surface, and below the second one from the proximal end are 2 near 

 together. The small granules are more separated than on the holo- 

 type and are distributed chiefly on the upper half of the outer- 

 surface. 



CALLIANASSA, species. 



Plato 59, fig. 5. 



Locality. — Panama Canal Zone. Top part of limy sandstone be- 

 low upper conglomerate, near foot of stairs, Gaillard Cut. Upper 

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

 and T. W. Vaughan, collectors. 1911. Station 6012c. Cat. No. 

 324277, U.S.N.M. 



Material.— Manus of left cheliped of a small specimen. Outer sur- 

 face visible. Very convex from top to bottom, a deep groove next to 

 the edge articulating with the carpus; upper and lower margins ill- 

 defined. 



