78 PALEOZOIC PALEONTOLOGY. 
Sv) 
MOLLUSCA. 
PELECYPODA. 
PTERINEA FLABELLA (Con.). 
Plate LII., Fig. 12. 
1884. Pterinea flabella Hall, Pal. N. Y., vol. V., pt. I., p. 93, pl. 14, 
figs. 1-21, pl. 15, figs. 1, 4-6, 8-10, pl. 83, figs. 11-12. 
In the Newfoundland locality several imperfect specimens of a large 
species of Pterinea have been observed, which seem to represent the 
common Hamilton species, P. flabella, of New York. In none of the 
specimens can the complete form of the shell be observed, but the 
shell is oblique, with a broad and nearly-flat posterior wing, the an- 
terior auriculation being destroyed in all of the specimens observed. 
The body portion of the left valve is subovate in outline and is marked 
with very coarse, rounded coste, with alternate finer ones, besides in- 
distinct, concentric lines of growth, these markings being identical 
with those of authentic specimens of P. flabella from the New York 
Hamilton shales. The height of the best-preserved specimen in the 
collection is about 40 mm. 
ACTINOPTERIA DECUSSATA Hall. 
Pilate oie. Ale 
1884. Actinopteria decussata Hall, Pal. N. Y., vol. Vey) Pte le go eas 
pl. 17, figs. 24, 28, pl. 18, figs. 1-15, pl. 20, fig. 19, pl. 84, 
fig. 4. 
Description.—Shell very oblique, with anterior and posterior wings ; 
the hinge-line straight, extending from beneath the beak to the ex- 
tremity of the posterior wing. The body of the left valve subovate in 
outline, anterior and basal margins regularly curved, the posterior 
margin from a little above the base, nearly straight to the beak; an- 
