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THE VOYAGE OF H.M.S. CHALLENGER. 
chamber apparently retains an independent existence. The cavity of the test is 
undivided, and the interior surface is quite smooth. 
Specimens of this or a closely allied organism nearly an inch in length have been 
dredged on the west coast of Scotland. They have thinner tests than those figured in 
Plate XXVI., the walls are somewhat flexible, the shape tolerably regular, long, and 
tapering; and the superior extremity, which is tubular and much drawn out, is 
divided into a number of minute branches, each terminating in an aperture, exactly 
as shown in the larger arms of Astrorhiza limicola (PI. XIX. fig. 1). 
Pelosina variabilis only occurs at two Challenger Stations, namely, in the South 
Pacific, east of New Zealand, 1100 fathoms, and far north in the North Pacific, 2050 
fathoms. Specimens were found in the soundings taken during the Austro-Hungarian 
North-Polar Expedition, off Franz-Josef Land, 125 fathoms. The large individuals 
described in the last paragraph were dredged by Mr. Robertson, off Cumbrae, 50 to 60 
fathoms ; and similar or perhaps larger examples have been collected by the Rev. A. M. 
Norman on the western shores of Scotland and on the coast of Norway. 
Pelosina rotundata, H. B. Brady (PI. XXV. figs. 18-20). 
Pelosina rotundata, Brady, 1879, Quart. Journ. Micr. Sci., vol. xix. N. S., p. 31, pi. iii. figs. 4, 5. 
Test consisting of a single, flask-shaped, or pyriform chamber with a produced 
membranous neck. Walls of the body thick, composed of Globigerina ooze or other 
soft mud. Diameter, jVth inch (1'8 mm.). 
This may perhaps be only a local variety of Pelosina variabilis, but it is usually of 
comparatively small dimensions, and consists invariably of a single globular or pyriform 
chamber. The walls are relatively very thick, and are composed of soft, greyish-white, 
muddy material, with scarcely any incorporating cement. It naturally follows that the 
central cavity occupies but a very small proportion of the entire bulk of the test. 
Pelosina rotundata has been found at the following localities : — in the North 
Atlantic, south of Rockall Bank, 640 fathoms, and west of the Azores, 1675 fathoms ; 
in the South Atlantic, south of Pernambuco, 350 fathoms ; and at a single Station in the 
North Pacific, 2050 fathoms. 
Pelosina cylindrica, n. sp. (PL XXVI. figs. 1-6). 
Test elongate, cylindrical, straight or slightly curved ; diameter nearly uniform from 
end to end, extremities rounded. Walls thick and soft, formed of fine mud and embedded 
shell fragments ; interior surface quite smooth. Aperture simple, situated at the centre 
of one end of the test. Length, \ inch (12 mm.). 
