DESCRIPTIVE CATALOGUE OF RECENT FORAMINIFERA. 279 



Section shows a simple tube, without initial globular cavity, coiled upon 

 itself in about twenty convolutions. Diameter, 0.75 to 3 mm. (- 3 V to & 

 inch). 



Localities. Off coast of Maryland, south of Marthas Vineyard, Gulf 

 of Mexico, coast of Brazil (stations 2171, 2243, 2383, 2385, 2580, 2760), 

 63 to 1,180 fathoms. 



AMMODISCUS TENUIS Brady. 

 (Plate 23, tig. 1.) 



A flattened disk, slightly, if at all, concave on the two faces, formed 

 of a simple unconstricted tube of nearly uniform diameter coiled upon 

 itself, each convolution slightly embracing the preceding. Differs from 

 the last described species chiefly in the uniform size of the tube, and in 

 the smaller number of convolutions. Diameter, about 2 mm. ( -^ inch). 



Localities. Off Cape Hatteras, off Nantucket Shoals, Gulf of Mexico, 

 Panama Bay (stations 2115, 2352, 2385, 2395, 2805), 50 to 850 fathoms. 



AMMODISCUS GORDIALIS Jones and Parker. 



(Plate 24, fig. 1.) 



Small, unsyminetrical in form, most often imperfectly lenticular; 

 formed of a single tube of nearly uniform diameter coiled upon itself in 

 varying directions. The degree of variation from the flat spiral differs 

 with each specimen. Color light brown. Diameter, about 0.5 mm. 

 (Jo inch). 



Localities. Off Nantucket Shoals, southeast of Marthas Vineyard, 

 and off coast of Oregon (stations 2041, 2568, 3080), 100 to 1,800 fathoms. 



AMMODISCUS CHAROIDES Jones and Parker. 



(Plate 24, fig. 2.) 



Small, subglobular, formed of a narrow tube of uniform diameter 

 coiled regularly in a series of superimposed layers, often terminating in 

 a partial or complete convolution wound around the globular coil in a 

 rectangular or diagonal direction; color brown; surface smooth and 

 polished; aperture the open end of the tube. Diameter, 0.4 mm. (- 

 inch). 



Localities. Off Nantucket Shoals and coast of Oregon (stations 2041, 

 3080), 90 and 1,600 fathoms. 



Genus WEBBINA. 



Test adherent; consisting either of a single tent-like chamber, or of 

 a number of such chambers connected by adherent stoloniferous tubes. 



WEBBINA CLAVATA Jones and Parker. 

 (Plate 24, fig. 3.) 



Test consists of either (1) the half of an oval or pear-shaped chamber, 

 adherent to a bit of shell or other object which closes the flat side of 

 the chamber, with a tubular prolongation of indefinite length also 



