EARLY TERTIARY CHEILOSTOME BRYOZOA. . 19 



zooecium, as in the family Adeonidee. These dietellae are invisible 

 externally, and they become apparent only in tangential sections of 

 some depth. 



PERIPOROSELLA TANTILLA, new species. 



Plate 2, figs. 3. 4. 



The zoarium is free, formed by two lamellae joined together and 

 inseparable. The zooecia are generally indistinct, very elongated, 

 rectangular ; the mural rim is broad, flat, enlarged at the base. The 

 opesium is elliptical, somewhat enlarged distally, and very finely 

 denticulated. The ovicell is deep, but placed above the large distal 

 septula ; it projects but little exteriorly. The avicularia are inter- 

 zooGcial, rare, elliptical, without pivot, but with two lateral denticles; 

 numerous dietellae in each zooecium. 



This type of structure is different fi'om all others on account of its 

 dietellae, its method of gemmation, its ovicell, and even its avicularia. 

 It certainly belongs to a family which our present zoological knowl- 

 edge will not yet permit us to suspect. 



Occurrence. — Middle Jacksonian: Wilmington, North Carolina 

 (common). Near Lenuds Ferry, South Carolina (rare). 



EutaAv Springs, South Carolina (rare). 



Type.— C^t. No. 62577, U.S.N.M. 



Genus ELLISINA Norman, 1903. 



1903. ElUsina Norman, Natural History of East Fiumark, Aunals aud 

 Magazine Natural History (7), vol. 11, p. 596. 



The zocecia are furnished with avicularia, ovoid or triangular, 

 situated on the hinder portion of the zooecium. The ovicell is well 

 developed, tj^pically with a flattened area on its front. In the type- 

 species the pore-chambers (dietellae) are very large; one distal; the 

 position of the remaining chambers is very unusual, the two front 

 lateral pairs project outside the side walls, which is the reverse of 

 the usual rule. 



Genotype. — Menibranipdra laxata Hincks, 1882. (Norman.) 

 Range. — Senonian-Recent. 



ELLISINA LAXA, new species. 



Plate 2, fig. 7. 



Description. — The zoarium incrusts pebbles and especially shells. 

 The zooecia are large, distinct, broad, ogival; the mural rim is very 

 thin, little salient, curved, finely striated. The opesium is very large 

 and of the same form as the zooecium. The avicularium Is triangular, 

 interzocecial, transverse, and without pivot. 



,, , r, • [Zs=0.75-0.95 mm. 



Measurements. — Zooecia , r. rr^ r^n^ 



I fe=0.50-0.75 mm. 



