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 five visible on the superior face 5 walls conspicuously perforated. 

 Diameter, 1 mm. (^ inch), more or less. 



Localities. Found in tropical and subtropical latitudes. Specimens 

 from the same stations Us the two preceding. 



GLOBIGERINA DIGITATA Brady. 

 (Plate 70, fig. 2.) 



Early segments spiral, regular, same as G. bulloides; 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 yEQUILATERALIS Brady. 

 (Plate 70, fig. 3.) 



Segments subglobular, increasing rather rapidly in size, arranged in 

 a flat 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. (- 3 L Q 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. Ko 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. 



