374 PALEOZOIC PALEONTOLOGY. 
median septum represented by a shallow groove in the casts. ‘The 
muscular scars are not well shown in any of the New Jersey speci- 
mens, but seem to resemble quite closely Hall’s figures of this species. 
Brachial valve not observed. 
The dimensions of an average specimen are: length, 15 mm.; 
width, 23 mm.; convexity, 5 mm. 
Remarks.—Because of the apparent crenulations of the hinge-line 
in the internal casts of this species, the specimens resemble members 
of the genus Stropheodonta, but these crenulations doubtless repre- 
sent the bases of cardinal spines. Internal casts of C. arcuatus from 
New York, illustrated by Hall, show similar crenulations. The con- 
stricted line in the internal casts is exactly as in the illustrations of 
typical specimens of C. arcuatus, and the muscular impressions are 
unlike any species of Stropheodonta, being closely similar, so far as 
they can be distinguished at all, to Hall’s illustration of C. arcuatus. 
SCHIZOPHORIA sp. cf. 8. STRIATULA (Schl.). 
Plate LII., Figs. 9-10. 
Several imperfect internal casts of a species of Schizophoria have 
been collected at Newfoundland. They are all too poorly preserved 
for certain identification, but have the general form of S. striatula or 
S. propinqua. The pedicle valve, however, seems to be too depressed 
for the latter species, and they may be doubtfully referred to 8S. 
striatula. 
AMPHIGENIA ELONGATA (Van.). 
Plate LIL, Figs. 6—7. 
1867. Amphigenia elongata Hall, Pal. N. Y., vol. IV., p. 383, pl. 
58 A, figs. 21-24, pl. 59, figs. 1-11. 
Description.—Shell subelliptical or subovate in outline, the length 
greater than the width, but the proportions variable. Pedicle valve 
the most convex, but in some individuals the two valves are nearly 
equally convex. The surface of the internal casts is smooth or is 
marked by rather coarse, more or less distinct, concentric lines of 
