NORTH AMERICAN EARLY TERTIARY BRYOZOA. 273 



Range. Jacksonian-Recent. 



In the Eocene and the Oligocene we still recognize the single species Cellaria 

 reussi D'Orbigny, 1852, of the Priabonian of Vicentin, Italy. 



CELLARIA STRICTOCELLA. new species. 



Plate 40, figs. 7-10. 



Description. Zoarium articulated; the segments cylindrical and symmetrical. 

 The zooecia are elongated, narrow, confluent among themselves; the cryptocyst is 

 of little depth, concave, smooth. The aperture is transverse, elliptical, without 

 oral denticles. The ovicell is small, rectangular with an orifice of the same form. 



j. r |Aa=0.08 mm. . (Lz= 0.40-0.45 mm. 



Measurement*. Aperture Zooecia{ 7 noert0 



ua=0.10mm. Us=0.25-0.30 mm. 



Affinities. Most of the time there is no oral armature; but sometimes deeply 

 embedded lamellae are visible. 



The micrometric dimensions are greater in the middle of the segments than at 

 their extremities. 



This species differs from Cellaria reussi D'Orbigny, 1852, in the form of its 

 zooecia, which are not hexagonal and in their quincunx arrangement. 



It differs from Cellaria dimorpha, new species, in the absence of all zooecial 

 dimorphism. 



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

 Xorth Carolina (uncommon). 



Cotypes.Czt. Xo. 64010, U.S.KM. 



CELLARIA DIMORPHA, new species. 



Plate 40, figs. 11-13. 



Description. The zoarium is articulated ; the segments are large, symmetrical, 

 somewhat conical, formed of a dozen longitudinal rows of dimorphic zooecia. The 

 small zooecia are rectangular, elongated, confluent through their mural rim; the 

 cryptocyst is smooth, deep; the aperture is elliptical and transverse. Within the 

 interior of the aperture there are two oblique symmetrically arranged lamellae. 

 The ovicell is endotoichal; its orifice is circular and completed by a small canal 

 the point of which is below and directed toward the proximal ovicell of the neigh- 

 boring row. The large zooecia have the same characters as the small. 



Measurements. Aperture of fAa=0.10 mm. Aperture of|Aa=0.20mm. 

 small zooecia [Za=0.12 mm. large zooecia U= 0.24 mm. 



. fZs=0.50mm. T . fZ3=0.45-0.55 mm. 



small zooecia <, Large zooecia , _ 



lfe=0.20mm. 1^=0.26 mm. 



Affinities. This species is very curious; and for the genus its characters are 

 quite divergent. Unfortunately the different oral organs of ihe living species have 

 not been thoroughly studied. 



55899 19 Bull. IOC 18 



