DEVONIAN FAUNAS. 317 
MERISTELLA LAEVIS (Van.). 
Plate XXXVIII., Figs. 11-18. 
1859. Merisia levis Hall, Pal. N. Y., vol. IIl., p. 247, pl. 39, 
figs. 1-4. 
Description.—Shell subovate in outline, a little longer than wide. 
Pedicle valve strongly convex, greatest prominence at about the middle, 
with a shallow mesial sinus toward the front; the beak prominent, in- 
curved. Brachial valve less convex than the pedicle, strongly convex 
on the umbo, with an ill-defined mesial fold towards the front. Sur- 
face of both valves smooth or marked only by obscure, concentric lines 
and by a few stronger, concentric lines of growth. 
The dimensions of a large specimen are: length, 28 mm.; width, 
2% mm.; thickness, 18 mm. 
Remarks.—This species attains its largest size in the Becraft lime- 
’ stone; its average size becoming less and less in the lower and lower 
beds, down to the Coeymans limestone. In the shaley member of the 
New Scotland beds the species is common, but the shells are almost 
universally crushed and distorted, so that they are usually propor- 
tionally broader, and resemble M. arcuata. 
MOLLUSCA. 
PELECYPODA. 
CYPRICARDINIA SUBLAMELLOSA Hall. 
1859. Cypricardinia sublamellosa Hall, Pal. N. Y., vol. IIL, p. 267, 
pl. 50, fig. 1. 
A fragment of an elongate, pelecypod shell, marked by concentric 
wrinkles, may represent this species. It occurs in the lower cherty 
limestone member of the New Scotland beds near Hainesville. 
