48 
HENRY B, BRADY, 
thick, composed of fine sand with but little cement. 
Cavity tubular, never of uniform diameter, but swollen 
at one or more points so as to form spurious chambers. 
Length about ;4; inch (10° mm.). 
This form is nearly allied to Astrorhiza granulosa 
(Marsipella granulosa, ‘Quart. J. Micr. Sci.,’ vol. 
xix, n.s., p. 36, pl. 3, figs. 8, 9), and is perhaps its North 
Atlantic representative ; but A. granulosa is of smaller 
dimensions, and the chamber-cavity consists of a 
narrow tube of even diameter throughout. 
A. angulosa, nov.—Test triangular (rarely quadrangular), 
depressed, biconvex, with rounded margin ; consists of 
a central chamber with radiating tubes, one passing to 
each corner, the open ends of which serve as apertures. 
Walls relatively very thick, and composed of loosely 
cemented fine sand. Diameter, 1 inch (3°6 mm.). 
A. angulosa appears to be a short, three-mouthed 
variety of A. granulosa, with which species it is found 
associated. . In both of these, as also in A. crassatina, 
the orifices are often partially blocked with sand-grains, 
and not unfrequently are stained reddish brown. 
RHABDAMMINA, Sars. 
Rhabdammina discreta, nov.—Test cylindrical, open at both 
ends ; consisting of a straight or nearly straight tube of 
indefinite length, spuriously segmented by slight con- 
strictions at irregular intervals. Walls thin, composed 
of angular sand-grains firmly cemented; interior smooth. 
Specimens nearly an inch (25° mm.) in length are not 
uncommon. 
BorE.iina, Carpenter. 
Botellina labyrinthica, nov.—Test arenaceous, cylindrical 
(probably growing attached by one end), straight, or 
slightly curved, somewhat irregular in external con- 
tour; one end round and more or less inflated, the 
other never hitherto found entire. The wall is of firm 
consistence and compactly built, except at the rounded 
extremity where it becomes a thin incomplete layer of 
sand grains with many interstitial openings. The 
interior, except near the rounded end, is subdivided 
irregularly by a labyrinth of coarse, sandy, spurious 
septa. The rounded terminal cavity forms an undi- 
vided chamber. Pieces hitherto obtained have seldom 
measured more than an inch (20° to 20° mm.), but it 
