Maryland Geological Survey 541 



characterization of them is therefore restricted to exterior features, but 

 the species is recognizable from its small and easily branching corallum. 

 Species of Heliophyllum occur elsewhere in the Chemung fauna but forms 

 of the expression of H. scrutarium are not known to the writer. 



Length of corallite 10-30 mm.; diameter 8-10 mm. 



Occurrence. — Jennings Formation, Chemung ? Member. On Side- 

 ling Hill Creek, Allegany County. 



Collection. — Maryland Geological Survey. 



Subclass HEXACOROLLA 



Order MADREPORIA 



Suborder TABULATA 



Family FAVOSITIDAE 



Genus FAVOSITES Lamarck 



Favosites sp. 

 Plate XLV, Fig. 9 



Description. — Fragments of a rather slender branching form of Fav- 

 osites occur as casts in the sandstone and consequently only the aspect 

 of their exterior is evident. As corals are unusual in sediments of this 

 age these specimens are worthy of note inasmuch as the characters shown 

 suffice to permit their recognition when found elsewhere. In general the 

 specimens may be compared to the branching middle Devonian species 

 Favosites arbusculus Hall (Hamilton, New York), but the stock and 

 branches are more slender. This stock is essentially cylindric, tapers 

 very slowly, undulates in growth and branches with irregularity. The 

 cell apertures are oblique, polygonal and almost devoid of interstitial 

 cellules. 



Diameter of corallum 6-8 mm.; diameter of corallites about 1 mm. 



Occurrence. — Jennings Forjiation, Chemung ? Member. On Side- 

 ling Hill Creek, Allegany County. 



Collection. — 'Maryland Geological Survey. 



