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 
Plagioecia. 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 PROBOSCIDEA Milne-Edwards, 1838. 
Plate 108, figs. 1-15. 
1900. Entalophora proboscidea Neviani, Briozoi neogenici delle Calabrie, Paleontographia 
italiea, vol. 6, p. 242 (128) (regional bibliography). 
1909. Entalophora proboscidea Canu, Bryozoaires des Terrains Tertiares des environs d<* 
Paris, Annales de Paleontologie, vol. 5, p. 11S, pi. 15, figs. 11, 12. (illustrated 
paleontologic bibliography). 
1915. Entalophora proboscidea Canu, Bryozoaires fossiles des terrains du Sud-Ouest de la 
France, Bulletin de la Society geologique de France, ser. 4, vol. 15, p. 331 (regional 
bibliography). 
1915. Entalophora proboscidea Harmer, The Polyzoa of the Sib.oga 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. 
M easurements. — Width of the zooecia 0.40 mm. 
Distance betw'een 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 figures (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) ; 3f miles of Perry, Georgia (very 
common) ; Rich Hill, 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 
Wrightsville, Johnson County, Georgia (rare) ; 34 miles north of Grovania, Geor- 
gia (rare) ; 17 miles northeast of Hawkinsville, Georgia (very rare). 
Upper Jacksonian (Ocala limestone) : West bank Sepulga River, Escambifi 
County, Alabama (common) ; Chipola River, east of Marianna, Jackson County, 
