196 PALAEONTOLOGY OF THE SUEVHY. 



ECHINODEKM. 



ASTRODAPSIS, Cmrad. 



AsTRODAPSis Antiselli, PL 10, figs. 1 & 2. — Pentangular, suboval; disk with 5 broad angular 

 profound depressions ; ambulacra not greatly curved, open at the marginal extremities ; apex 

 central or subcentral, beneath flat, or slightly depressed, with 5 distinct furrows ; anus sub- 

 marginal. 



Locality . — Estrella . 



Masses of limestone appear to be composed chiefly of the fragments of this species, and con- 

 tain many entire, but apparently water-worn specimens. In this respect it resembles a Miocene 

 rock on the Patuxent river, Maryland. Length, If inches. 



