470 
THE VOYAGE OF H.M.S. CHALLENGER. 
Station in the North Pacific, 2300 fathoms ; and at one in the South Atlantic, 
2200 fathoms It has also been dredged by Balk will and Wright in Dublin Bay, 45 
fathoms. 
Lagena hertwigiana, H. B. Brady (PL LYIII. fig. 36, a.b., woodcut, fig. 12). 
Lagena hertwigiana, Brady, 1881, Quart. Journ. Micr. Sci., vol. xxi., N. S., p. 62. 
Test pyriform, with delicate ectosolenian neck rising abruptly from the apex. Surface 
finely reticulated, each angular mesh with a conspicuous perforation in the centre. 
Sections show that the shell- wall is double, that the intermediate space is divided into 
cells or chamberlets by perpendicular walls, of which the external areolation marks the 
position, and that the larger perforations open into the cells. Length, ^th inch 
(0'34 mm.). 
The external features of Lagena hertwigiana are well depicted in fig. 36, to a scale 
of 75 diameters ; and the minute structure of the shell-wall is indicated by the annexed 
woodcuts, which represent longitudinal and transverse 
sections, magnified 200 diameters. The neck is a pro- 
longation of the inner or primary shell. In abraded or 
worn specimens the test presents a soft and spongy appear- 
ance, owing to the cellulated pithlike structure of the 
external or supplementary shelly growths. 
Morphologically, the cellulation of the shell- wall may be 
supposed to have its origin in the reticulated form of orna- 
ment, the raised network being closed-in by the formation 
of a thin exterior shelly lamina. 
A variety differing slightly from the figured specimen is 
occasionally met with, in which the perforations are arranged 
in nearly regular equidistant lines, precisely as may be 
seen in the later segments of Nodosaria intercellularis. 
This is probably directly related to the group of forms in 
which the reticulated ornament consists of longitudinal costae and transverse bars. 
The best examples of Lagena hertwigiana have all been obtained from one locality, 
off Baine Island, Torres Strait, 155 fathoms, where both varieties are found. Less 
characteristic specimens occur at Station 160, south of Australia, 2600 fathoms; and 
similar forms have been dredged by the Rev. A. M. Norman on the coast of Norway, 
south of Bukken, near Bergen, 150 to 200 fathoms. 
Fig. 12 . — Lagena hertwigiana. 
a. Longitudinal section of the shell. 
b. Transverse section. 
Magnified 200 diam. 
