NORTH AMERICAN EARLY TERTIARY BRYOZOA. 607 



This fossil species bears the largest oral avicularium (0.18 by 0.15 mm). 

 Occurrence. Middle Jacksonian : Wilmington, North Carolina (common) ; 

 Rich Hill, Crawford County, Georgia (very common). 

 Cotypes.C&t. Nos. 64214. 64215, U.S.N.M. 



HOLOPORELLA GRANULOSA, new species. 



Plate 16, figs. 1-9. 



Description. The zoarinm is massive and formed of small globular masses 

 fixed to bryozoa or to shells, which it surrounds completely. The superficial 

 zooecia are little erect, oblique, large, elliptical; the frontal is convex, surrounded 

 by widely spaced areolae and formed of a granular pleurocyst placed on the olocyst. 

 The apertura is large, semilunar, with a concave, proximal border; the peristome 

 bears laterally one to two lateral avicularia. The ovicell is hyperstomial, recum- 

 bent, transverse, small, somewhat salient, granular, widely open above the apertura. 

 The deep zooecia have a normal apertura and a very salient, peristomial avicularium. 

 The incomplete zooecia are rare. The interzooecial avicularia are rather large, 

 oval, little salient, without pivot. 



,, 1^/7=0.15 mm. 



Measurements. Apertura \ , 



iz=o.rr mm. 



Variations. The zooecia in contact with the substratum (fig. 5) are oriented; 

 on the lower face of the zoarinm the zooecia are visible, irregular ; their walls have 

 two or three calcareous layers. The granular pleurocyst is detachable from the sub- 

 jacent olocyst (fig. 81 and the two calcareous formations are often visible. In the 

 interior (fig. 6) the apertura is oblique and without cardelles. The ovicell is of 

 the same nature as the frontal (fig. 4). The interzooecial avicularia (figs. 3, 7) 

 are quite remarkable in the absence of pivot. 



Affinities. By its zooecial aspect this species much resembles Holoporetta 

 descostilsii Savigny-Audouin, 1826, of recent seas. It differs simply in the presence 

 of peristomial avicularia. 



Occurrence. Claibornian (Gosport sand) : Claiborne, Alabama (rare) ; Gopher 

 Hill, Tombigbee River, Alabama (rare) ; 1 mile southwest of Rockville. Clarke 

 County, Alabama (very common). 



Claibornian (Cook Mountain formation) : Moseleys Ferry, Caldwell County, 

 Texas (rare). 



Claibornian (Lisbon formation) : Wautubbee Hill, Clarke County. Mississippi 

 (very common). 



Lower Jacksonian (Moodys marl) : Jackson, Mississippi (common). 



Cotypes. Cat, No. 63858, U.S.N.M. 



HOLOPORELLA CRASSICOLLIS, new species. 

 Plate 76, figs. 11. 12. 



Description.- The zoarium is unilamellar and incrusts shells. The zooecia are 

 little erect, almost always oriented ; the frontal is smooth and convex. The aperlura 



