DEVONIAN FAUNAS. B57 
tremely fine radiating striae and usually by a few lamellose lines of 
growth. 
The dimensions of the most-nearly perfect specimen observed are: 
length, 12 mm:; width, 19 mm.; thickness, 8.5 mm. 
Remarks.—This species is very abundant at Locality 6 A, near Mon- 
tague post-office. The pedicle valves are by far the most abundant, 
only a few brachial valves having been observed. One of these, an 
interior, preserves the primary lamelle of the brachidium, each with 
a short jugal process near the centre of the valve, pointing towards 
the pedicle valve, but not joined together to form a jugum, the brachi- 
dium being similar to that of the genus Spirifer. In some cases the 
brachial valve appears to be nearly flat throughout, or has a slight, 
general convexity. The species differs from either of the other mem- 
bers of the genus in its greater size and in its strongly-plicated shell. 
ANOPLOTHECA FLABELLITES (Con.). 
Plate XLIX., Figs. 1-2. 
1859. Leptoceha flabellites Hall, Pal. N. Y., vol. I1I., p. 449, pl. 
103 B, figs. 1 a-f, pl. 106, figs. 1 a-f. 
Description —Shell semi-elliptical, subcircular or subovate in out- 
line, usually broader than long; the cardinal extremities rounded. 
Pedicle valve convex, most prominent towards the beak, sloping rather 
abruptly to the cardinal margin and more gently to the lateral mar- 
gins, more or less depressed medially toward the front in a narrow 
sinus, with a single plication in the bottom; beak pointed, rather 
strongly incurved, with a circular foramen in the apex; delthyrium 
closed in its lower part by a pair of deltidial plates. Brachial valve 
flat, with a low, narrow mesial fold in the anterior half, marked by 
two plications; the cardinal margins diverging from the beak at a 
variable angle of from 110° to 150°. Surface of each valve marked 
by from twelve to sixteen simple, rounded or subangular, radiating 
plications, of which two somewhat larger ones, with a smaller one 
between, occupy the median portion of the pedicle valve, the smaller 
median one being depressed between the larger ones toward the front 
into a narrow and more or less prominent sinus. On the brachial 
valve the two median plications are somewhat elevated above the 
