260 PALEOZOIC PALEONTOLOGY. 
LEPERDITIA GIGANTEA Nn. Sp. 
Plate XXIII., Fig. 14. 
Description.—Carapace very large, subreniform in outline. Dorsal 
margin straight, about three-fifths of the total length of the valves, 
its anterior extremity obtusely angular, its posterior extremity round- 
ing into the nearly semi-circular posterior margin. Ventral margin 
gently convex, anterior margin broadly rounded, nearly as high as the 
posterior margin. Hye tubercle distinct, situated at about the middle 
of the antero-dorsal quarter of the valves; behind the eye tubercle 
there is a broad, shallow, indistinct, flattened sulcus, which extends 
downward from the hinge-line nearly to the centre of the valve. The 
antero-dorsal angle is distinctly compressed, and the flattened area 
extends around the anterior margin as a marginal border. The pos- 
terior margin is also bordered by a more or less distinct, flattened 
border. Surface smooth. 
The dimensions of a large specimen are: length, 22.5 mm.; height, 
14 mm.; convexity of one valve, 6 mm. 
DESCRIPTIONS OF SPECIES IN THE MANLIUS LIMESTONE FAUNA. 
COEKLENTERATA. 
HY DROZOA. 
STROMATOPORA sp. undet. 
In the lower beds of the Manlius limestone some layers are almost 
completely composed of small, more or less subglobular or lenticular 
masses of a Stromatoporoid, which are usually not over 20 mm. or 30 
mm. in diameter. They are not preserved in such a way as to exhibit 
the minute structure, even in thin sections, so that any definite identifi- 
cation of the material, either generic or specific, is impracticable. 
