684 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
certain of the determination the originals should be examined, but this has not been 
possible. 
This species differs from Heteropora ovalis in its orbicular orifices and in its 
zoarial apophyses. 
Occurrence . — Claibornian (Gosport sand) : One mile southwest of Rockville, 
Clarke County, Alabama (rare). 
Lower Jacksonian (Moodys marl) : Jackson, Mississippi (very rare). 
Plesiotype . — Cat. No. 65433, U.S.N.M. 
Fig. 223. — Forma Multicrescis D’Orbigny, 1852. 
A-G. Multicrescis variaMlis D’Orbigny, 1852. A. Different forms of the zoarium, natural 
size. B. A zoarium, X 4, showing the superposed layers of tubes. C. Portion of the surface 
much enlarged. (A-C after Novak, 1877.) D. A claviform zoarium, X 5. E, F. Two aspects of 
the surface enlarged, showing the zooecia varying in size according to that of the mesopores. G. 
Portion of transverse section through a zoarium. ( D-G after D’Orbigny, 1852.) 
H. Multicrescis tuberosa Romer, 1889. Part of vertical section, X 7, showing the beginning 
of an upper layer. (After Gregory, 1909.) 
Genus MULTICRESCIS D'Orbigny, 1852. 
1852. Multicrescis D’Okbigny, Paleontologie frangaise, Description des animaux invertebres, 
Terrain Crdtace, vol. 5, p. 1073. 
The zoarium is massive or branched and composed of successive thin layers of 
zooecia. 
Genotype. — Multicrescis variabilis D’Orbigny, 1852. 
Range. — Neocomian-Helvetian. 
