752 SYSTEMATIC PALEONTOLOGY 



HEMIASTER sp. 



Description. A few imperfect and fragmentary specimens of a He mi- 

 aster have been found in the indurated layers of the Matawan formation 

 on the Chesapeake and Delaware Canal. Two specimens show quite 

 clearly the anterior ambulacral furrow with part of the adjacent anterior 

 path. These forms may belong to the species Hemiaster welleri from the 

 Matawan of New Jersey. 



Occurrence. MATAWAN FORMATION. One and one-half miles east of 

 the Maryland-Delaware Line, Chesapeake and Delaware Canal, Delaware. 



Collection. Maryland Geological Survey. 



COELENTERATA 



CLASS ANTHOZOA 



subclass HEXACORALLA 

 order MADREPORARIA 



Suborder APOROSA 



Family TURBINOL1DAE 



Genus TROCHOCYATHUS Milne Edwards and Haime 



TROCHOCYATHUS ( ?) VATJGHANI sp. nov. 

 Plate XLVIII, Figs. 5, 6 



Description. Corallum cuneiform, with no recognizable scar of attach- 

 ment; viewed from the side it is subtriangular in outline and a little 

 elongated in the direction of the height; cross-section lenticular with dull 

 acute angles at the ends. 



Theca well developed. Corresponding to the septa are strong, sub- 

 acute, tuberculated ribs with deep intercostal depressions; new ribs are 

 intercalated as new septa are formed; on the sides bordering the acute 

 edges are tuberculated bands broadest below, narrowing to the serrated 

 edge above. 



Septa about thirty-six, of which about twenty-four extend inward to 

 the columella. The septa are in three or four cycles, but the different 



