DESCRIPTIVE CATALOGUE OF RECENT FORAMINIFERA. 303 



PLANISPIRINA CELATA Costa. 



(Plate 47, fig. 5.) 



Contour long oval with projecting ends, somewhat compressed, the 

 two sides unequally convex, the margins thick and rounded; surface 

 rough, and texture sandy; aperture small and arched. Length, about 

 1.25 mm. ($ inch). Transverse section shows the arrangement of 

 chambers to be the same as in the last described species. 



Localities. The vicinity of Aspinwall, west coast of Cuba, coast of 

 Brazil, and coast of Oregon (stations 2144, 2352, 2760, 3080), 100 to 

 1,000 fathoms. 



Subfamily IPEIN^raOFLrDinST^K. 



Test planospiral or cyclical, sometimes crozier- shaped, bilaterally 

 symmetrical. 



Genus CORNUSPIRA. 



CORNUSPIRA FOLIACEA Philippi. 

 (Plate 48, fig. 1.) 



A very thin, flat shell, consisting of a tube without partitions or con- 

 strictions, minutely narrow at first, but gradually and rather rapidly 

 becoming larger and more compressed, the tube evenly coiled upon 

 itself in a perfectly flat spiral; surface wrinkled transversely; aperture 

 a long narrow slit formed by the abrupt termination of the flattened 

 tube. 



Localities. Gulf of Mexico, and off Marthas Vineyard (stations 2352, 

 2377, 2383, 2550), 210 to 1,180 fathoms. 



CORNUSPIRA INVOLVENS Reuss. 



(Plate 48, fig. 3.) 



A simple coiled tube, minute in the earlier convolutions, growing 

 larger and stouter in the later turns without becoming flattened as in 

 C. foliacea just described. Diameter, 0.625 to 1.5 mm. (/- to -$ inch). 



Localities. Caribbean Sea, Straits of Yucatan, and coast of Georgia 

 (stations 2150, 2352, 2416), 276 to 463 fathoms. 



CORNUSPIRA CARINATA Costa, species. 



(Plate 48, fig. 2.) 



A simple planospiral coil, intermediate in form between C. foliacea 

 and C. involvens. The tube increases gradually in size and its outer 

 margin is marked by a narrow keel. Diameter, about 1.5 mm. (^ inch.) 



Locality. Gulf of Mexico (station 2394), 420 fathoms. 



Genus PENEROPLIS. 



Chambers undivided ; arrangement either planospiral throughout or 

 spiral only at the commencement, subsequently becoming rectilinear 

 or cyclical. 



