726 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



The known species of the zoarial form known as Entalophora are classified 

 when the ovicell is known in the three genera Diaperoecia, Mecynoecia, and 

 Plagioccia. Those which belong to Plagioecia have compact fronds of hollow 

 zoaria, incrusting roots of algae, and in which the primitive berenicoid form is 

 thus modified by the substratum. The species belonging to the genus Diaperoecia 

 are relatively rare and have an aspect of regularity unknown in the other genus. 

 The species belonging to the genus Mecynoecia are the most common. For the 

 forms without ovicell we maintain as heretofore the zoarial genus Entalophora. 



MECYNOECIA PEOBOSCIDEA Milne-Edwards. 1838. 



Plate 108, figs. 1-15. 



1900. Entalophora proboscidea NEVIANI, Briozoi neogenici clelle Calabrie, Paleontographia 



italica, vol. 6, p. 242 (128) (regional bibliography). 

 1909. Entalophora proboscidea CANU, Bryozoaires des Terrains Tertiares des environs d" 



Paris, Annales de Paleoutologie. vol. 5, p. 118, pi. 15, figs. 11, 12. (illustrated 



paleontologic bibliography). 

 1915. Entalophora proboscidea CANTJ, Bryozoaires fossiles des terrains du Sud-Ouest de la 



France, Bulletin de la Societe geologique de France, ser. 4, vol. 15, p. 331 (regional 



bibliography). 

 1915. Entalophora proboscidea HARMER, The Polyzoa of the Sibo/ja expedition, p. 108, pi. 



10, fig. 12 (recent bibliography ) . 



Diameter of the aperture 0.16 mm. 



Diameter of the peristome 0.16-0.20 mm. 



Width of the zooecia 0.40 mm. 



Distance between the peristomes 1.20-1.40 mm. 



Length of the peristomie 0.30-0.40 mm. 



Variations. This species is quite variable like all the common species, but its 

 micrometric measurements are rather constant and it is very difficult to discover 

 important varieties. The ovicell is not very constant in its form as may be noted 

 from the published figure? (fig. 225). Probably under the name of Entalophora 

 proboscidea, there are many species of which it will be necessary to discover the 

 constant characters. 



Occurrence. Midwayan (Clayton limestone) : Mabelvale, near Little Rock, 

 Arkansas (very common). 



Middle Jacksonian: Wilmington, North Carolina (very common); near 

 Lenuds Ferry, South Carolina (very common) ; 3 miles of Perry, Georgia (very 

 common) ; Rich Hill, 5 miles southeast of Knoxville, Crawford County, Georgia 

 (very common) ; one-half mile southeast of Georgia Kaolin Co. mine, Twiggs 

 County Georgia (rare) ; 12 miles southeast of Marshallville, Georgia (very com- 

 mon) ; Baldock, Barnwell County, South Carolina (very rare) ; 18 miles west of 

 Wrights ville, Johnson County, Georgia (rare) ; 3i miles north of Grovania, Geor- 

 gia (rare) ; 17 miles northeast of Hawkinsville, Georgia (very rare). 



Upper Jacksonian (Ocala limestone) : West bank Sepulga River, Escambia 

 County, Alabama (common) ; Chipola River, east of Marianna, Jackson County, 



M c asi ire me n ts. 



