GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 157 



CALAPPA FLAMMEA (Herbst). 



Plate 61, figs. 4 and 5. 



Cancer flammeus Hekbst, Naturg. ol. Krabben u. Krebse, vol. 2, 1794, p. 

 161. pi. 40, fig. 2 ; vol. 3. pt. 3, 1803, p. 19. 



Locality. — Near Mount Hope, Panama Canal Zone, in ditch 

 through swampy ground about one-fourth mile from present sea 

 beach, 6 to 8 feet above high tide; Pleistocene series; D. F. Mac- 

 Donald, collector. April, 1911. Station 5850. Cat. No. 324237, 

 U.S.N.M. 



Represented only by one dactylus or movable finger belonging to 

 the stronger chela. The milling of the stridulating ridge on the 

 inner surface just below the upper edge is more strongly marked than 

 in most of the recent specimens examined. 



Measurements. — Extreme length, 15 mm.; width just distal to the 

 upper marginal tooth, 4.7 mm. 



Distribution of Recent material. — From North Carolina to Colom- 

 bia and Venezuela. 



CALAPPA ZURCHERI Bouvier. 



Calappa surcheri Bouvier, Bull. Mus. Hist. Nat. Paris, vol. 5, 1899, p. 190, 

 text-fig. 



Panama. Lower Miocene. 



Not represented in the Museum collection. 



CALAPPELLA, new genus. 



Carapace very little broader than long, without clypeiform ex- 

 pansions, but with a spine at the junction of the antero-lateral and 

 postero-lateral borders, and a spine at each end of the posterior 

 border. 



Front small, projecting forward beyond the orbits. 



Orbits small, directed forward. 



In the narrow front and small orbits, this genus resembles Calappa, 

 but in its narrow carapace armed with 4 slender spines, it differs 

 from that genus as well as from all other Calappinae. 



Type of the genus. — C alappella quadrispina, new species. 



CALAPPELLA QUADRISPINA, new species. 



Plate 58, figs. 1 and 2. 



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

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

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

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



