64 BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



Length 0.85 mm., breadth 0.30 mm. Cat, No. 324638, U.S.N.M. 



Specimens referred to this species were very common in material 

 from U.S.G.S. No. 6036, Gatun formation, in dark-colored, fine- 

 grained sandy clay marl, from Monkey Hill, Mount Hope Station. 

 Many of the specimens become almost uniserial in the last-formed 

 portion. 



Genus SIPHOGENERINA Schlumberger, 1883. 



SIPHOGENERINA RAPHANUS (Parker and Jones) var. TRANSVERSUS, new variety. 



Plate 22, fig. S. 



Description. — Test subcylindrical, composed of comparatively few 

 chambers, the earlier ones spirally arranged, later and greater por- 

 tion of the test uniserial, sutures very prominently indented, be- 

 tween the longitudinal costae, aperture with a short cylindrical neck. 



Length, 1.25 mm. ; diameter, 0.54 mm. Cat. No. 324646, U.S.N.M. 



This variety differs from the typical form in the much greater 

 prominence of the transverse depressions marking the sutures, occa- 

 sionally as in the figure suggesting the depressions of S. dimorpha. 

 The specimens were frequent in material from U.S.G.S. No. 6010, 

 lower part of the Culebra formation, in dark clay, north of Pedro 

 Miguel Locks. 



Family GLOBIGERIMIDAE. 



Genus GLOBIGERINA d'Orbigny, 1826. 



GLOBIGERINA BULLOIDES d'Orbigny. 



GloMgerina bulloides d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 277, No. 1 ; 

 Modeles, No. 17, and No. 76; in Barker, Webb, and Berthelot. Hist. 

 Nat. Isles Canaries, 1839, pt. 2, Foraminiferes, p. 132, pi. 2, figs. 1-3, 

 28.— H. B. Beady, Rep. Voy. Challenger. Zoology, vol. 9, 1884, p. 593, 

 pi. 77 ; pi. 79, figs. 3-7. 



Description. — Test subglobose, spiral, visible portion composed of 

 but few chambers from below, usually three to five, all visible from 

 the dorsal side, sutures deep, chambers inflated, umbilicate below; 

 surface reticulate; aperture single, from each chamber, of good size 

 opening into the central umbilical cavity on the ventral side. 



Diameter, 0.60 mm. Cat. Nos. 324639-45. 



Specimens referable to this widely distributed species were ob- 

 tained from the following stations : In the Culebra formation, 

 U.S.G.S. No. 6009, from black clays and sandy beds at lower end 

 of Pedro Miguel Locks; 6010 in dark clay, north of Pedro Miguel 

 Locks; 6019/, in fourth limy bed from bottom, Las Cascadas sec- 

 tion, Gaillard Cut. In the Gatun formation, U.S.G.S. No. 60296, 



