ANTHOZOA. . 271 



The dimensions of the type specimen are : diameter of corallum 

 at base, 10 mm.; minimum diameter of corallum, 5.5 mm.; 

 diameter of corallum at summit, 8 mm. ; height of corallum, 

 14.5 mm. 

 ,,^^ Remwr'ks. — A single example of this coral has been observed. 

 It is a mo'Uld from which all the calcareous material of the 

 corallum has been removed by solution. During life it grew 

 attached to the inner surface of a dead pelecypod shell. The 

 species may be distinguished from other members of the genus by 

 its extremely broad basal attachment and by its remarkably deep 

 calice. 



Formation, and locality: — Navesink marl, Mullica Hill (169). 



Geographic distribution. — New Jersey. 



Family FUNG-IDAE. 



Genus Micrabacia Milne-Edwards and Haime. 



Micrabacia americana Meek and Hayden. 



Plate v., Figs. 14-17. 



i860. Micrabacia coronuia M. & H., Proc. Acad. Nat. Sci. Phil. 



(i860), p. 430 (Not M. coronuia M.-Ed. & Haime, 



1850). 

 1864. Micrabacia Ainericana Meek, Check List Inv. Foss. N. 



A., Cret. and Jur., p. 2. 

 1876. Micrabacia Americana Meek, Inv. Cret. and Ter. Foss. 



Up. Mo., p. I, pi. 28, figs. I a-d. 



Description. — "Corallum small, subplano-convex, or slightly 

 concave below, and convex with a rather deep central depression 

 above. Intercostal foramina of the mural disk, oval and numer- 

 ous. Rays or costse of the under sid.e straight, about 12 at the 

 middle, but bifurcating so as to number near 100 around the 

 periphery, apparently denticulate. Septa few at the center, 

 but increasing by the intercalation of smaller ones between, so as 

 to equal the number oif the costse, with which they alternate at 

 the periphery, very finely and sharply denticulate on the upper and 

 lateral edges." — Meek. 



