COELENTERATA 



Class ANTHOZOA 



Subclass TETRACORALLA 



Family ZAPHRENTIDAE 



Genus ZAPHRENTIS Rafinesque 



Zaphrentis martlandicus n. sp. 

 Plate XLV, Figs. 1, 2 



Description.- — Corallite simple, slightly curved, conical, diameter in- 

 creasing a little more rapidly toward apex. Exterior showing indistinct 

 septal furrows and slight irregular annular constrictions. Calyx shallow 

 in proportion to length of corallite, width usually exceeding depth; its 

 bottom wide, often flat, sides erect, edges thin. Septa about 80 in 

 larger specimens, alternating in length, usually but not always reaching 

 center, appearing as ridges upon bottom of calyx. Fossette deep, on con- 

 vex side of calyx. Tabulae unknown. 



Length of corallite 55 mm.; diameter of calyx 27 mm. 



This species differs from Z. chemungensis in (1) larger size, (3) 

 more distant septa, (3) calyx proportionally much shallower. It is known 

 only by casts of calyx and exterior, hence its generic position is not 

 assured. Although its interior structure is not known, the perfect pres- 

 ervation of the interior of its calyx renders it worthy of a specific name. 



Occurrence. — Jennings Formation, Chemung Member. National 

 Road on Polish Mountain, 2706,' abundant. 



Collection. — Maryland Geological Survey. 



* The numbers after localities indicate the stratigraphic altitude above the 

 base of the Jennings formation. 



