NORTH AMERICAN EARLY TERTIARY BRYOZOA. 461 



Variations. On the same zoarium the zooecia are not regularly arranged ; 

 they radiate from false ancestrulae, forming thus so many subcolonies that they 

 result in zooecial deformation. The line of areolae is often double or triple in the 

 lower part of the zooecia (fig. 3). The separating thread is little salient (fig. 1) 

 or very thick (fig. 4). In the latter case of great pleurocystal calcification the 

 areolae are quite large. 



The area of the ovicell is formed of a thin olocystal layer covered by a pleuro- 

 cystal layer ; it is very fragile and is very easily broken. 



Affinities. This species differs from Smittina collum in the absence of an 

 avicularium on the peristome. 



Smittina grandifossa differs from Smittina coronata in its larger dimensions 

 (Lz=l.QO mm. and not 0.50 mm.) and in its smooth and not granular pleurocyst. 



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

 Carolina (common). 



Cotypcs. Cat. No. 64124, U.S.N.M. 



SMITTINA CORONATA, new species. 



Plate 59, fig. 11. 



Description. The zoarium is unilamellar and creeps over algae. The zooecia 

 are somewhat elongated, distinct, hexagonal, separated by a salient thread; the 

 frontal is little convex and bordered laterally by a row of triangular areolae ; the 

 olocyst perforated laterally supports the granular pleurocyst, bordered with short 

 interareolar costules. The peristome is thin and little prominent; the peristomice 

 bears a pseudo-rimule, at the base of which is the lyrula. The ovicell is hyper- 

 ' stomial, placed on the distal zooecia, completely surrounding the apertura ; it is 

 formed of a porous area surrounded by a collar or crown, salient and smooth. 



,, T> , \hpe=0.15 mm. . \Lz=0.55-O.Q5 mm. 



Measurements. Feristomice , Zooecia , 



(lpe~0.la mm. [/s=0.4o mm. 



Affinities. This species differs from Smittina grandifossa in its smaller micro- 

 metric dimensions (Lz=0.55 mm. and not 1.00 mm.) and in the granulations of the 

 pleurocyst. 



It differs from Smittina collum in its smaller dimensions, in the absence of an 

 oral avicularium, and in the presence of the pleurocystal granulations. 



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

 Carolina (rare). 



Holotypc.Cat. No. 6412G, U.S.N.M. 



SMITTINA ANGULATA Reuss, 1865. 



Plate 60, figs. 1-16. 



1865. Cumulipora angulata REUSS, Die Foraminiferen, Anthozoen und Bryozoen des 

 deutschen Septarienthones, Denkschriften der k. Akademie der Wissenschaften, 

 Wien, vol. 25, Abth. 1, pi. 8, fig. ]2. 



Description. The zoarium is large, massive, irregular, with lobed branches, 

 multilamellar, hollow; it incrusts large algae or shells. The zooecia (in the more 



