318 _ PALEOZOIC PALEONTOLOGY. 
ACTINOPTERIA sp. undet. 
Fragments of winged pelecypod shells are frequently met with in 
both members of the New Scotland beds and in the Becraft limestone, 
but none of the specimens observed are sufficiently well preserved for 
specific identification, although all are doubtless members of the genus 
Actinopteria. 
MYTILARCA ? sp. undet. 
+ 
Plate XXXIX., Wig. 4. 
An imperfect specimen of a pelecypod shell resembling members of 
the Silurian genus Mytilarca occurs in the lower cherty limestone 
member of the New Scotland beds near Hainesville. It is altogether 
too imperfect for identification or description, but may be referred 
provisionally to this genus. 
GASTROPODA. 
STROPHOSTYLUS GEBHARDI (Con.). 
Plate XXNIX., Figs. 1-3. 
1859. Platyceras gebhardi Hall, Pal. N. Y., vol. III., p. 312, pl. 56, 
figs. 5 a, b, 6, 7, 9, pl. 55, figs. 6 a—b. 
Description.—Shell deeply umbilicate below, consisting of three or 
four rather rapidly-expanding volutions, which are contiguous through- 
out or to near the aperture and are subcircular or subovate in cross- 
section. Apex of the spire lying nearly in the plane of the outer 
volution, the suture deeply impressed. Surface marked by fine, 
transverse lines of growth. 
The dimensions of a nearly-perfect specimen are: maximum di- 
ameter, 31 mm.; height of aperture, 22 mm.; width of aperture, 
21 mm. 
