DESCRIPTIVE CATALOGUE OF RECENT FORAMINIFERA. 323 



inflated into various and irregular forms, the peripheral extremity often 

 bearing several short digital outgrowths; apertures multiple, large, 

 often live visible on the superior face; walls conspicuously perforated. 

 Diameter, 1 mm. (■£§ inch), more or less. 



Localities. — Found in tropical and subtropical latitudes. Specimens 

 from the same stations as the two preceding. 



GLOBIGERINA DIGITATA Brady. 

 (Plate 70, fig. 2.) 



Early segments spiral, regular, same as G. bulloidcs; last three seg- 

 ments of the final convolution elongated and rounded at the ends like 

 the fingers of a glove, spreading radially. 



Locality. — A single specimen from the Gulf of Mexico (station 2377), 

 210 fathoms. 



GLOBIGERINA /EQUILATERALIS Brady. 



(Plate 70, fig. 3.) 



Segments subglobular, increasing rather rapidly in size, arranged in 

 a fiat coil of about one convolution and half another, all the segments 

 being equally visible on both sides; aperture a large arched opening 

 on the inner face of each segment; walls conspicuously perforated; 

 surface rough with the short stumps of broken spines. Diameter, about 

 0.8 mm. (/o inch). 



Locality. — Specimens dredged off the Windward Islands (station 

 2751), 687 fathoms. 



Genus ORBULINA. 



Test having the form of a single spherical chamber with two sorts of 

 perforations, large and small. 



ORBULINA UNIVERSA d'Orbigny. 

 (Plate 69, fig. 1.) 



Typically in the form of a perfect sphere with thin walls inclosing a 

 single chamber; occasionally two or three chambered shells are found; 

 walls sometimes laminated, profusely perforated with both very fine 

 and comparatively large orifices. No general aperture. Diameter, 

 about 0.8 mm. (^ inch). 



Localities. — The most common of all the species of foraminifera. 

 Found in every sea. 



Genus HASTIGERINA. 



Test regularly nautiloid, involute; shell wall thin, finely perforated; 

 armed with long serrate spines. Aperture a large crescentiform opening 

 at the base of the last chamber. 



