NORTH AMERICAN EAKLY TERTIARY BRYOZOA. 219 



Occurrence. Middle Jacksonian (Castle Hayne limestone) : Wilmington, 

 North Carolina (rare). 



Cotypes. Cat. No. 63978, U.S.N.M. 



DIPLOPHOLEOS LINEATUM, new species. 

 Plate 82, fig. 15. 



Description. The zoarium incrusts shells. The zooecia are hexagonal, elon- 

 gated, confluent by means of their mural rims. The cryptocyst is deep, granular, 

 longer than the opesium; the polypidian convexity is projecting, crenulated along 

 its opesial border; the opesinlar indentations are deep, sometimes linear; the 

 opesium is elongated, semielliptical, narrowed above the opesiules by two promi- 

 nent denticles. The onychocellarium is small, fusiform, without distal canal; its 

 opesium is median, elliptical, crenulated. 



|7io=0.20 mm. I Zs 0.44mm. 



Measurements. Opesium i, nir . Zooecmm , 



(lo=0.12 mm. U.?=0.40-0.50mm. 



Zon=0.35 inm. 



The long linear opesia are rather rare; there are some perfectly round. The 

 opesial dimorphism is not apparent on the few specimens we possess and we 

 classify the species only by analogy. 



Affinities. This species differs from Diplopholcos fusiforrne in its small 

 onychocellarium and its linear opesiules. 



The opesial dimorphism is not very evident on the specimens found. 



Occurrence. Vicksburgian (Marianna limestone) : Near Claiborne. Monroe 

 County, Alabama (very rare) ; Salt Mountain. 5 miles south of Jackson, Alabama 

 (very rare). 



Vicksburgian (Byram marl) : By ram, Mississippi (rare). 



Holotype.Cs*,. No. 64252, U.S.N.M. 



Genus FLORIDINA Jullien, 1881. 



1881. Floridina JULLIEN, Note sur une nouvelle division des Bryozoaires Cheilostomes, 

 Bulletin Societe Zoologique France, vol. 6, p. 13. 



The retractor muscles of the polypide are attached in the median axis of the 

 zooecium. The opesiular indentations are symmetrical, very large, limited above 

 by the two very salient opesial processes and placed on each side of a much pro- 

 duced. semitubular, polypidian convexity. The zooecium is closed by an operculum 

 attached to the ectocyst; the opercular axis of rotation is located above the two 

 opesial processes. The onychocellaria are straight, without the small, distal canal. 

 rounded at their apex; the mandible is bimembranous. Ovicell endozooecial. 



The general aspect of the opesium is trifoliate. 



Genotype. Floridina (Mollia) antiqua Smitt, 1872. 



Range. Senonian-Eecent. 



Species of Floridina for the most part are found incrusting algae. 



