CHAZY LIMESTONE. 
15 
CORALS AND CRINOIDEA OF THE CHAZY LIMESTONE. 
Plate IV. 
18. 1. RETEPORA INCEPTA. 
Pl. IV. Figs. 1 a, b. 
A thin expanded leaflike coral, apparently composed of branches uniting laterally and 
often irregularly ; fenestrules oval or sometimes slightly angular, unequal in size ; branches 
or reticulations even, roundish, scarcely expanded ; no pores visible. 
This species presents the common appearance of others of the genus, except that the 
above fragment shows no axis or central point of expansion, and in this respect resembles 
a fragment of Gorgonia. In the irregular arrangement of the fenestrules, it differs from 
any of the species yet noticed. 
Fig. 1 a. Specimen of the natural size. 
Fig. 1 b. An enlarged portion of the same. 
Position and locality. In the semi-oolitic limestone near the lower part of the mass at 
Chazy, and in a similar limestone near Galway, Saratoga county. 
19. 2. RETEPORA GRACILIS (n.sp.). 
Pl. IV. Figs. 2, 2 a. 
Expansion slender, diverging ; fenestrules oblong-oval; branches or interfenestral spaces 
slender, flexuous, slightly striated; no pores visible. 
This species differs from the last in its more slender appearance, the greater length of 
the fenestrules, and the smaller interfenestral divisions. The crust or expansion is less firm 
and solid. The nature of the stone almost effectually prevents the discovery of any pores 
upon the substance of the coral. The rock in which this and the preceding species occur 
is a semicrystalline greyish limestone, exhibiting in some parts a tendency to an oolitic 
structure. 
Fig. 2 a. Natural size of the fragment. 
Fig. 2 b. Enlarged portion, showing the form of the fenestrules. 
Position and locality. This species occurs in the lower part of the Chazy limestone, below 
the position of the Maclurea gigantea, at the village of Chazy, Clinton county. 
{State Collection.) 
