58 HENRY B. BRADY. 
and frequently terminating in a long, stout spine at the 
inferior end. Test thickest on the median line, and 
sloping away symmetrically to the sides; margin sub- 
acute. Segments numerous, about ten in each series ; 
long, curved, obliquely set. Shell stoutly built, sutures 
thickened, usually limbate and somewhat crenulate 
externally. Length, #4 inch (0°6 mm.). 
B. decussata, nov.—Test elongate, compressed ; broad and 
obliquely truncate at the superior extremity, and taper- 
ing to a rounded point at the inferior; margin thick, 
square, or slightly rounded, lobulate. Surface beset 
with low prominences or bosses, rounded or subangular 
in outline, arranged with some regularity in oblique 
rows, about four in each row, and entirely concealing 
the septation. Length, 5 inch (0°dmm.). 
B. Hantkeniana, nov.—Test depressed, equally convex on 
the two faces; varying in contour, from a relatively 
long form tapering to a point at the base, to broadly 
oval one with rounded ends. Composed of numerous, 
rounded, inflated segments, in two more or less regular 
alternating series, surrounded by a delicate keel of 
varying width and completeness. Surface often tra- 
versed by short, delicate, longitudinal coste. The long 
narrow specimens seldom have a continuous wing or 
keel, and they attain a length of about =. inch 
(0°9 mm.), whilst those of wider proportions with the 
broader more regular wing are less than 5 inch long 
(0°6 mm.) and about = inch (0°5 mm.) broad. 
B. Karreriana, nov.—Test elongate, tapering, broadest near 
the top, somewhat depressed ; inferior extremity pointed, 
often mucronate ; margin thick and rounded, lobulate. 
Surface of the test ornamented with numerous delicate, 
often branching, or otherwise irregular, longitudinal 
ribs. Segments inflated; aperture large, oblique. 
Length, +; inch (0°63 mm.). 
B. lobata, nov.—Test elongate, depressed, digitate; superior 
extremity obliquely truncate or rounded, inferior obtuse. 
Segments inflated, especially the later ones, their peri- 
pheral margins subangular. Surface of the later cham- 
bers more or less granulated. Sutures thickened, deeply 
sunk. Aperture a long oval slit contracted at the 
middle ; nearly central. Length ,); inch (0°4 mm.). 
B. Schwageriana, nov.—Test oblong, biconvex, broadest 
near the middle, tapering to a blunt point at the in- 
ferior extremity ; margin carinate. Keel widest near 
the middle of the shell, absent at the inferior end. 
