00 BULLETIN 00, UNITED STATES NATIONAL MUSEUM. 



The sulci are not always apparent on the dorsal. The peristome may 

 bear two small aviciilaria. The branches are sometimes quite close 

 together. 



Occurrence. — Middle Jacksonian: Wilmington, North Carolina 

 (very common), near Lenuds Ferry, South Carolina (very common). 



Upper Jacksonian (Ocala limestone) : Chipola River, east of Ma- 

 rianna, Jackson County, Florida (rare). 



Type.—C-dt No. 62600, U.S.N.M. 



Family HIPPOPODINIDAE Levinsen, 1909. 



The frontal is calcified. The ovicell is endozocecial. 

 We have extended the meaning of Levinsen's definition since we 

 include in this family all the species provided with an endozocecial 

 ovicell. Evidently we can not affirm that they all have the same 

 larva; but the identity of the ovicell implies that tlie larvae are at 

 least closely related. 



The known genera of this family, all represented in American 

 strata, are as follows: 



Cheilopora Levinsen, 1900. 

 Hifpopodina Levinsen, 1909. 

 Metrarabdotos Canu, 1914. 

 Watersipora Neviani, 1895. 



Genus CHEILOPORA Levinsen, 1909. 



1909. Cheilopora Levinsen, Morphological and Systematic Studies on the 

 Cheilostomatous Bryozou, p. 353. 



The frontal is a tremocyst with pores in quincunx not separable 

 from the olocyst subjacent and perforated with very small corre- 

 sponding pores. Two dietellae. " The distal wall has no expansion 

 partly separating the ovicell from the zoa^cium; multi})orous sep- 

 tulae; peristome present in the form of a liplike projection." 

 (Levinsen, 1909.) 



Genotype. — Cheilopora {Lepralia) siiicera Smitt, 1867. 



Range. — Aquia-Eecent. 



Cheilopora {Lepralia) Jalnosa Ulrich, 1901, and nine new species 

 represent this genus in the early Tertiary of America. 



Genus HIPPOPODINA Levinsen, 1909. 



1909. Ilippopodina Levinsen, Morphological and Systematic Studies on the 

 Cheilostomatous Bryozoa, p. 353. 



The apertura is provided with two cardelles. The frontal is a 

 tremocyst placed on a finely perforated and very thin olocyst. The 

 ovicell is endozocecial. "The horizontal part of the distal wall is 



