REPORT ON THE FORAMINIFERA. 
277 
is No. 299, lat. 33° 31' S., long 74° 43' TV., between the Island of Juan Fernandez and 
the western coast of South America, depth, 2160 fathoms. It occurs also, but in nothing 
like the same profusion, at the next Station, a little further west, depth 1375 
fathoms. The figured North Atlantic specimens are from the “ Porcupine ” Station No. 37, 
depth, 2435 fathoms. I have notes also of the occurrence of the species in two other 
localities in the North Atlantic, at depths of 630 fathoms and 1125 fathoms respectively ; 
at two points between the Cape of Good Hope and the Kerguelen Islands, 1570 fathoms 
and 1375 fathoms; at two in the South Pacific, namely, off Kandavu, Fiji Islands, 210 
fathoms, and close to the equator, 2425 fathoms ; and at one Station in the North 
Pacific, 2900 fathoms. 
Rliizammina indivisa, n. sp. (PL XXIX. figs. 5-7). 
Test free, cylindrical, flexible ; consisting of an unbranched chitino-arenaceous tube, 
often tapering towards the ends. Apertures terminal. Length, |rd inch (8 mm.), more 
or less. 
Flexible unbranched tubes, the investment of a Rhizopod to all appearance closely 
allied to the species last described, not unfrequently present themselves in dredged 
material, especially in Globigerina ooze from moderate depths. Our knowledge of these 
forms is as yet very slight, and all that can at present be done is to describe their 
salient characters, and to furnish a name by which they may be identified. Some 
spp.c iru e.us of the sort referred to are figured in PI. XXIX. figs. 5-7. 
The test is cylindrical and seldom straight ; it generally tapers towards the 
extremities, one or both of which may occasionally be found with a constricted mouth, 
but more frequently in preserved specimens the ends are broken or collapsed. The 
chitinous envelope is of brownish colour, and comparatively slender, but it is encrusted 
with Globigerince or other foreign bodies, often to a considerable thickness. The exterior 
of the test is always rough, and sometimes transversely wrinkled, as in fig. 7. 
Characteristic specimens of Rhabdammnia indivisa, coated with Globigerince, occur 
in the Faroe Channel, 540 fathoms ; others, encrusted with siliceous or calcareous sand, 
off the Cape of Good Hope, 150 fathoms ; off Kandavu, Fiji Islands, 210 fathoms ; and 
elsewhere. 
There are yet other membranous tests, such as those represented in PI. XXIX. figs. 
1-3, of which it is impossible to say more than that, when fresh, they appear to be filled 
with dark-coloured granular protoplasm, and are therefore in all probability Rhizopods 
nearly related to Rliizammina. The tests consist of delicate, slightly-coloured, chitinous 
or membranous tubes, from -^^th to ^th inch (0T to 0*8 mm.) in diameter, and of 
indefinite length, sometimes naked and sometimes surrounded by a thin loose coating of 
mud which is easily removed, the membrane itself being transversely marked or 
(ZOOL. CHALL. EXP. PART XXII.— 1883.) Y 36 
