MARYLAND GEOLOGICAL SURVEY 419 



Family SCHIZOPORELLIDyE. 



Genus SCHIZOPORELLA Hincks. 



ScHizopoRELLA INFORMATA (Lonsdale). 



Plate CXIV, Figs. 6-10. 



Cellepora infonnafa Lonsdale, 1845, Quar. Jour. GeoL 5<oc. London, voL i, p. .505. 

 Reptocelleporaria inforinata d'Orbigny, 1852, PaL France, vol. v,ip. 433. 

 Reptocelleporaria inforinata Tuomey and Holmes, 1857, Pleiocene Fossils of South 



Carolina, p. 15, pi. iv, ligs. 11, 12. 

 Jieptocelleporaria informata Giibb and Horn, 18fJ2, Jour. Acad. Nat. Sci. Phila., 2nd 



ser., vol. V, j). 132. 



Bescriptiun. — Zoariuiii forming irregular, generally botryoidal or nod- 

 ulose masses by the superposition of layer after layer of zorecia ; average 

 size of masses between two and four centimeters. Zooecia often devel- 

 oped in direct sequence, and as they separate easily from their neighbors, 

 vertical fractures generally exhilnt a columnar structure. In each of 

 the layers they are arranged more or less irregularly, the degree of irreg- 

 ularity being as a rule in proportion to the relative unevenness of the 

 surface. Formally developed, they are oblong subquadrate or hexagonal 

 with the sides slightly rounded or obtusely angular, the relation of 

 length to breadth being as four is to three, or eight to five; average 

 length about 0.5 mm. When crowded they take any suitable sha])e, 

 some being wider than long, others much narrower than the normal 

 form. Orifice terminal, subcircular though always somewhat trans- 

 verse, in the same plane as the upper surface, surrounded by a distinct 

 though but little elevated peristome; proximal notch narrow, deep, 

 sharply defined. Surface of zorecia con\ex, very distinctly punctate, 

 except on a small spot a short distance beneath the orifice that is often 

 raised into a low tuljercle. Avicularia not often present, though a few 

 may be detected on most specimens examined, of medium size, divided 

 into two compartments, and situated on either side close to the proximal 

 angle of the orifice. 



Ovicells abundant in some specimens, rare or wanting in others, of an 

 unusual type, consisting of subglobular, punctate inflations covering a 

 whole zooecium; usually broken as shoAvn on Plate CXII, Fig. 10. 



The peculiarities of the ovicell distinguish this species from all others 

 of the genus known to us. Otherwise it is not far removed from 



