DEVONIAN FAUNAS. 
(SX) 
Or 
Me) 
MERISTELLA LATA (Hall). 
Plate XLVII., Figs. 15-20. 
1859. Merista lata Hall, Pal. N. Y., vol. IIL., p. 431, pl. 101, figs. 
3 a-™M. 
Description—Shell transversely subelliptical, subrhomboidal, -or 
longitudinally suboval in outline, usually wider than long. Pedicle 
valve strongly convex, its greatest elevation near the middle, with a 
rounded mesial sinus of moderate depth toward the front, the beak 
incurved over that of the opposite valve. Internally the muscular 
impressions are large and strongly-defined. Brachial valve nearly as 
convex as the pedicle, often somewhat flattened laterally, with an 
ill-defined mesial fold toward the front. Surface of both valves 
marked by fine, concentric striz and by a few stronger, sublamellose 
lines of growth. 
The dimensions of an average specimen are: length, 30 mm.; 
width, 34 mm. 
Remarks.—This species is never well preserved in the Oriskany 
formation of New Jersey, and usually occurs in the form of internal 
casts of the pedicle valve. Such specimens may always be easily 
recognized by the broad and strongly-elevated cast of the muscular 
impression. The species is a common one and may usually be de- 
tected wherever fossils are present in this formation. 
MOLLUSCA. 
PELECYPODA. 
ACTINOPTERIA INSIGNIS Clarke ( 7). 
Plate L., Fig. 2. 
1900. Actinopteria insignis Clarke, Mem. N. Y. St. Mus., No. 3. 
vol. III., p. 35, pl. 4, figs. 10-13. 
Several imperfect examples of a winged pelecypod shell having 
the size and characteristics, so far as they can be determined, of 
