822 



BULLETIX 106, UNITED STATES NATIONAL MUSEUM. 



Affinities. In its multiserial fascicles this species much resembles Lichenopora 

 verrucosa Philippi, 1843. It differs from it in the greater width of its fascicles, 

 which are continued almost to the zoarial margins. The orifice of the cancelli is 

 less excavated. 



In 1877 Manzoni did not appear to admit the identity of the Oligocene species 

 with the Miocene; we do not see, however, any essential difference. Our specimens 

 from Monroeville, Alabama, are very well represented by the figures given for the 

 Miocene form, although generally the central area is much smaller. 



We have not discovered the ovicell, nor the spinules. The species is perhaps not 

 a Lichenopora^ and it will be necessary to await the collection of a large number of 

 specimens before placing it definitely. 



Occurrence. Vicksburgian ( Marianna limestone) : One mile north of Monroe- 

 ville, Alabama (very abundant) ; Salt Mountain, 5 miles south of Jackson, Ala- 

 bama (common) ; near Claiborne, Monroe County, Alabama (rare). 



Geological distribution. Rupelian of Germany (Eeuss) ; Chattian of Germany 

 (Keuss) ; Tortonian of Austria-Hungary (Keuss). 



Plesiotypes.G&t. No. 65-474, U.S.N.M. 



FIG. 270. Orosopora, new genus. 



A. Ovicelled specimen, X 2r>, of Desmeplagioecia (Lichenopora) linetata MacGillivray. 

 (After Waters, 1888.) (Introduced by error.) 



B. Portion of ovicelled zoariuni, X 12, of Orosopora (Lichenopora) ciUata Busk, 1875. 

 (After Waters, 1887.) 



OROSOPORA, new genus. 



Greek : oros, signifying border. 



The ovicell is placed near the zoarial margin and not at the center of the 

 zoariuni. 



Genotype. Orosopora (Lichenopora) ciliata Busk, 1875. 



Range. Recent. 



Genus TROCHILIOPORA Gregory, 1909. 



1909. Trochilioiiora GREGORY, Catalogue Fossil Bryozoa in Department of Geology, British 



Museum, Cretaceous Bryozoa, vol. 1, p. 265. 



Lichenoporidae with a single top shape or capitate zoarium, composed of a 

 constricted stem and expanded head. Apertures in vertical series on the margin of 

 the head. (After Gregory.) The lower face bears cancelli. 



Genotype. TrochiHopora humei Gregory, 1909. Santonian. 



