REPORT ON THE FORAMINIFERA. 
279 
This singular little organism occurs amongst tlie Nullipore debris of shallow water in 
the South Pacific, in company with other parasitic Rhizopods, such as Placopsilina, 
Planorbidinci, and Truncatulina. Instances of Foraminifera, either free or adherent, 
with distinctly reticulating test are exceedingly rare ; but it is not difficult to understand 
how the inosculation of the passages takes place. The branches commonly bifurcate at 
their extremities, and each fresh branchlet after growing about a thirtieth of an inch, 
more or less, divides again in the same way ; so that however irregular the growth, the 
sarcode projecting from the different apertures must occasionally meet, and when this 
occurs the ends coalesce ; the investment being formed as growth proceeds, a more or 
less reticulated condition of necessity results. The test is finely arenaceous, and it 
appears to be really tubular ; that is to say, it is not a mere tent-like covering without a 
floor proper to itself, like that of Webbina. It grows in little patches a quarter of an 
inch or more in diameter, of white or yellowish- brown colour. The ends of the branches 
are seldom perfect, owing to their fragile nature, but when they have been accidentally 
protected and remain complete they present smooth, slightly contracted, rounded 
apertures formed of clear shell-substance uncoated with sand. 
The best specimens of Sagenella fronclescens have been found on Nullipores and frag- 
ments of shell dredged off the Admiralty Islands, at a depth of from 16 to 35 fathoms. 
A similar, perhaps identical, organism occurs off Tongatabu, Friendly Islands, 18 fathoms ; 
but the specimens lack distinctive characters. 
Botellina, Carpenter. 
Botellina, Carpenter [1869] Butschli, Brady. 
As only a single species has hitherto been assigned to the genus Botellina, and our 
knowledge of the type is still far from complete, no attempt need be made to separate 
generic from specific characters. 
Botellina labyrinthica, H. B. Brady (PL XXIX. figs. 8-18). 
Botellina, sp., Carpenter, 1869, Proc. Roy. Soc., voh xviii. p. 444; — 1870, Descr. Cat. of Objects 
from Deep-sea Dredgings, p. 4, No. 3. 
Botellina labi/rinthica, Brady, 1881, Quart. Journ. Micr. Sci., vol. xxi. N. S., p. 48. 
Test arenaceous ; cylindrical, straight or slightly curved, somewhat irregular in out- 
line ; one end round and more or less swollen (the natural condition of the other end not 
certainly known). Wall of the test of firm consistence and compactly built, except at 
the rounded extremity, where it becomes a thin and incomplete layer of sand-grains with 
many interstitial openings. Interior of the tube subdivided irregularly by a labyrinth of 
coarse sandy partitions, except the rounded terminal cavity, which forms an undivided 
chamber. Length, judging from the broken specimens, 1 inch (25 mm.) or more ; 
diameter about -|th inch (3 mm.). 
