CORALLINE LIMESTONE. 
327 
It is difficult to characterize a species when only the mutilated interior of the shell exists, 
though the form of the muscular impression is in this case almost. sufficient to distinguish the 
species. 
Fig. 4 a. The interior of the ventral valve, with the dental laminae worn off. 
Fig. 4 b. An enlargement from the surface of this specimen. 
Fig. 5 a. The impression of the dorsal valve, with some portions of the shell remaining. 
Position and locality. In the Coralline limestone at Schoharie. 
(Collection of John Gjcbhard junior.) 
685. 2. STROPHODONTA TEXTILIS (n. sp.). 
Pl. LXXIV. Fig. 6a-d. 
Semioval, wider than high ; hinge line slightly extended beyond the width of the shell; sur¬ 
face marked by numerous close flat striae, which are crossed by fine concentric striae, giving the 
surface a finely textile appearance - } hinge line crenulated. 
The specimen figured is the ventral valve, on which the shell is preserved near the base and 
partially elsewhere, but broken away along the hinge line. The casts of the muscular im¬ 
pression are also preserved. 
Fig. 6 a. The ventral valve described. 
Fig. 6 b. The hinge line enlarged, showing impressions of the crenulations. 
Fig. 6 c. A farther enlargement of a portion of the same, showing the crenulations. 
Fig. 6 d. A portion of the surface enlarged, showing the fiile concentric striae. 
Position and locality. In the Coralline limestone at Schoharie. 
(Collection of John Gebhard junior.) 
686. 10. SPIRIFER- sp. 
Pl. LXXIY. Figs. 7,8 a-d. 
These specimens all have the external portion of the shell exfoliated. They are closely allied 
to S. crispus; but two of them are of a much larger size than this species usually attains. 
There are evidences also of four or five costae, which scarcely rise above the surface. In one of 
them still remain some marks of concentric striae, but not sufficient to decide positively the 
relations of the species. The specimens are all attached to the rock, and in two of them the 
outlines are somewhat obscured by it. 
This is evidently closely allied or identical with S. crispus , and not with the species in the 
tentaculite limestone above, which has sharper plications and more distinct concentric striae, as 
well as longitudinal striae between them, as in S. sulcatus of the Niagara group. 
