Maryland Geological Survey 543 



Diameter of branches at calyx 2 mm.; at base 1 mm.; length of 

 branches 5-7 mm. 



This genus differs from AnJopora in that the branches are not attached 

 inferiorly to other objects but are in large part free. This is probably 

 the same species as one usually described as Cladochonus sp. which occurs 

 in the Ithaca of New York. Very abundant in the Ithaca fauna, rare 

 in the Chemung of Maryland. 



Occurrence. — Jennings Formation, Chemung Member. EUerslie, 

 1316. WooDMONT Member, Ithaca Fauna. Hancock 690, 994; Han- 

 cock-Harrisonville Eoad, 2 miles northeast of Hancock, 736, abundant; 

 Berkeley Springs, West Virginia, 755, 825, abundant. 



Collection. — Maryland Geological Survey. 



ECHINODERMATA 



Class ASTEROIDEA 



Subclass ENCRINASTERIAE 



Genus PALAEASTER Hall 



Pal^aster clarki n. sp.' 

 Plate XLVI, Figs. 3, 4 



Description. — This species is represented in the collections by a single 

 specimen affording a pretty sharp cast of both sides of a very regular and 

 complete individual. In general structure and appearance the species is 

 quite similar, especially on the oral surface, to Palceastev eucharis Hall 

 of the sandy Hamilton shales of central New York, but the latter is a 

 much larger form. 



The disk is small, rays long and slender, thecal plates all prominently 

 developed. The ambulacral surfaces are represented only by a narrow 

 linear depression beneath which the ambulacral plates are concealed. 

 These depressions are bordered by thickened and somewhat elevated 

 quadrangular or pentangular adambulacra. The marginal plates are in 



' Thus nanied, as a supererogatory tribute to Prof. W. B. Clark. 



