1878.] 17 [Rathbun. 
Lingula Rodriguezii Rathbun. 
Bull. Buffalo Soc. Nat. Sci., 1, no. 4, p. 260, 1874. 
Found, with Discina lodensis, in the Devonian shales of Ereré. 
(Morgan Ex., 1870.) | 
Lingula Stauntoniana Rathbun. 
Bull. Buff. Soc. Nat. Sci., 1, no. 4, p. 259, fig. 3, 1874. 
Moderately abundant in the Devonian shales of Ereré, associated 
with Discina lodensis, etc. (Morgan Ex., 1871; Geol. Comm., 1876.) 
Lingula Gracana Rathbun. 
Bull. Buff. Soc. Nat. Sci., 1, no. 4, p. 259, fig. 2, 1874. 
Rare in the Devonian shales of Ereré, associated with Discina lo- 
densis. (Morgan Ex., 1870; Geol. Comm., 1876.) 
Discina lodensis Hall. 
Orbicula lodensis Vanuxem, Geol. Rept. Third Dist. N. Y., p. 168, 
1842; Hall, Geol. Rept. Fourth Dist. N. Y., p. 223, 1843. Discina 
lodensis Hall, Paleont. N. Y., 1v, p. 22, 1867; Rathbun, Bull. Buff. 
Soc. Nat. Sci., 1, no. 4, p. 257, 1874. Compare Discina media Hall, 
Eazont. N. Y.,1v, p. 20, 1867. 
This species is very abundant in the dark shales of the Devonian 
of Ereré, and the collections obtained from there, represent it in its 
various stages of growth, from the very young to the adult shell. 
(Morgan Exs., 1870 and ’71; Geol. Comm., 1876.) 
Productella meecuruensis, sp. nov. 
Shell small and slightly asymmetrical in shape; length and breadth 
nearly equal, giving an irregularly subcircular outline to the shell, 
which is somewhat flattened posteriorly; hinge line straight and 
slightly shorter than the width of the shell; cardinal extremities not 
preserved in the single specimen obtained. 
Ventral valve very convex (but rather less so than is usually the 
case in this genus), quite strongly curved from side to side, and 
strongly and nearly regularly curved from the beak to the front, 
the point of greatest prominence of the valve being, however, 
slightly posterior to the middle. Beak rather small, but strongly 
arched and regularly rounded, and projecting some distance behind 
the hinge line. The convexity of the umbo broadens with moderate 
rapidity forward, leaving the portions of the valve bordering the 
cardinal extremities slightly and irregularly flattened. The want of 
symmetry in the ventral valve results from the beak and more promi- 
nent line of curvature lying a little nearer the right margin than 
the left. Dorsal valve unknown. 
PROCEEDINGS B. S. N. H.— VOL. XX. 2 DECEMBER, 1878. 
