DESCRIPTIVE CATALOGUE OF RECENT FORAMINIFERA. 281 



TROCHAMMINA PROTEUS Karrer. 



(Plate 25, fig. 3.) 



Test formed of a continuous tube, increasing slightly in diameter 

 from the beginning, constricted at frequent and irregular intervals, 

 coiled into the form of a disk, the convolutions being nearly in the 

 same plane, or sometimes contorted into irregular forms. Diameter, 

 1.25 mm. (^ inch). 



Localities. Off west coast of Cuba, coast of Yucatan, Gulf of Mexico, 

 Windward Islands, and coast of Brazil (stations 2352, 2355, 2394, 2750, 

 2760), 400 to 1,000 fathoms. 



TROCHAMMINA LITUIFORMIS Brady. 

 (Plate 26, fig. 1.) 



Consists of a simple tube, constricted at irregular intervals, coiled 

 upon itself at the beginning either in planospiral convolutions or 

 irregularly, subsequently becoming linear and more or less bent or con- 

 torted; surface smooth, color light brown ; aperture terminal. Length, 

 5 mm. (J inch) or less. 



Localities. Gulf of Mexico and coast of Brazil (stations 2352, 2394, 

 2395, 2760), 350 to 1,000 fathoms. 



TROCHAMMINA CORONATA Brady. 

 (Plate 26, fig. 3.) 



Test large, thick, biconcave, composed of numerous inflated segments 

 arranged in a close spiral of three or more convolutions; walls dis- 

 tinctly arenaceous, even, but not smooth; sutures depressed; color 

 pale brown or buff; aperture simple, terminal. Diameter, about 2 mm. 

 (A inch). 



Locality. Gulf of Mexico (station 2395), 347 fathoms. 



TROCHAMMINA CONGLOBATA Brady. 



(Plate 26, fig. 2.) 



A tumid, subglobular shell, formed of a thin, irregularly segmented 

 tube coiled upon itself in a constantly varying plane; segments much 

 inflated, often transversely wrinkled; aperture the open, slightly con- 

 stricted end of the tube; color brownish white. Diameter, about 1 mm. 

 (A- inch). 



Locality. Gulf of Mexico (station 2395), 347 fathoms. 



TROCHAMMINA RINGENS Brady. 

 (Plate 27, fig. 1.) 



Test nautiloid, composed of a series .of segments, rather rapidly 

 increasing in size, arranged in planspiral convolutions, the final whorl 

 completely inclosing the previous ones; contour ovoid, compressed, 



