Monthly Mlcroscopican 
Journal, Feb. 1, 1869. J 
North Atlantic Deposits. 
109 
Gen. Cadium. Bailey. Shell, siliceous, hyaline, entire, oval, or 
lageniform. 
G. marinum. var. a. (Wall,) Shell, lageniform, but with the 
neck recurved, so as to place the anterior aperture in a vertical 
plane ; aperture, about ^rd the diameter of the body of shell ; length, 
about Troth of an inch ; meridional grooves about 5 in ' 001 of an 
inch; striae, 15 in "001 of an inch. Plate III., Fig. 5, 
Var. /6. (Wall,) Shell, lageniform ; neck, not bent ; aperture, at 
a right angle to the long axis of shell ; posterior extremity in both 
these varieties, with a minute tubercular or mammiliform elevation. 
Fig. 6. 
The shell of Cadium differs essentially from that of the Fora- 
minifera in being purely siliceous, which the shells of the Forami- 
nifera never are; and from those of the Folycystina in being, 
although purely siliceous, entire and imperforate save at its anterior 
and posterior apertures. The anterior aperture is circular, frequently 
somewhat thickened. The meridional grooves are striated, the 
grooves never extending beyond the base of the neck of the flask- 
like shell. 
Hab, North Atlantic, at depths varying from 371 to 2000 
fathoms. 
G, caudatum. n. s, (Wall.) Body of shell, oval, produced 
anteriorly into a lengthened neck, which is more or less recurved, 
so as to place the aperture in a nearly vertical position ; posterior 
extremity, surmounted by a delicate hollow and gradually tapered 
caudiform process (sometimes twice as long as the body of the 
shell) forming curve, the direction of which is towards the anterior 
aperture ; surface of shell, sometimes quite plain, sometimes marked 
as in G. marinum ; length of oval body, from -ai^th to ^ri) th of an 
inch. Fig. 9, 
In this example the anterior aperture is slightly expanded, and 
sarcode mass is seen rolled up into a spherical mass, as if encysted.* 
In Fig. 8, the anterior aperture is of the same diameter 
throughout. 
In Fig. 10, it is greatly expanded, and forms a saucer-shaped 
cavity. 
In both these specimens the caudiform appendage has apparently 
been broken off close to the body. 
Figs. 11 and 12 represent smaller varieties of the simple 
lageniform type and that with the recurved neck— the latter show- 
ing the anterior aperture in a front view. 
Gen. Protocystis. (Wall.) Shell, sihceous, entire, hyahne ; sub, 
globular ; surface of shell fitted with minute circular depressions. 
* This condition may, however, be due, with equal probability, to the death of 
the animal, and its subjection to a vastly increased pressure on subsiding to the 
bottom. 
