Morgan Expeditions. 120 
Abundant in the Devonian sandstone of Ereré, Prov. of 
Para, Brazil, with Spirifera Pedroana, Streptorhynchus 
Agassizii, ete. 
Nuculites Ererensis, sp. nov. 
Shell small, elongate, nearly twice as long as high, sub-elliptical in 
outline, the margins forming quite a regular elliptical curve, broken by 
the slight upward extension of the beaks. Dorsal margin oblique and 
nearly straight. Beaks situated about one-third the length from the 
anterior margin, small, only slightly incurved, and apparently not reach- 
ing to the hinge line. The convexity of the valves is moderate, being 
greatest just below the umbonal region. The septum extends downwards 
for about three-fifths the height of the valves, and intersects the antero- 
posterior diameter at a little less than one-third its length from the front. 
Length, 138™™; height, 8™™; depth of single valve, nearly 3™™. 
This species of Muculites is readily distinguished from 
the last one above described, NW. Nyssa of Hall, by its 
elongate form and nearly elliptical outline, and by the 
absence of any flattening along the middle. Only two 
specimens have yet been obtained. These are both inter- 
nal moulds of the left valve, and the surface markings are 
not preserved upon them. 
Found, with Spirifera Pedroana, ete., in the Devonian 
sandstone of Ereré, Prov. of Para, Brazil. 
Genus GRAMMYSIA, De Verneuil. 
Grammysia (Pholadella?) parallela. 
Grammysia parallela, Hall. Lamell. Shells of the U. Held., Ham. and 
Chem. Groups, etc., 1869. (Preparatory for the Paleontology of N. Y.) 
Shell small, elongate, about two-thirds as high as long, with the greatest 
height at the beaks. Valves moderately convex, the surface arching 
strongly from the beaks to the ventral margin, but being rather more ab- 
ruptly curved in the upper portion. The beaks are situated at about one- 
fourth or one-fifth the length of the shell from the anterior extremity, and 
project but little above the hinge margin; they are small, rather strongly 
arcuate and turned somewhat abruptly forward, with the apices acute and 
contiguous. Dorsal margin straight and extending directly backward. 
The anterior margin extends obliquely forward in its upper half, forming 
at the beaks an angle of about 135° with the dorsal margin, and is slightly 
