528 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
Affinities . — We have not found the ovicell of this extremely rare species and 
its generic determination naturally remains somewhat doubtful. 
We have already mentioned the presence of analogous avicularian zooecia in 
Porella planulata and in Metropemella gramdipora. 
The great narrowness of its zooecia absolutely characterizes this species and 
does not permit it to be confused with any other. 
Occurrence . — Middle Jacksonian; Near Lenuds Ferry, South Carolina (very 
rare) ; Baldock, Barnwell County, South Carolina (very rare). 
Ilolotype — Cat. No. 64177, U.S.N.M. 
CHEILOPORA GRANDIS, new species. 
Plate 68, figs. 3-5. 
Description . — The zoarium is unilamellar and creeps over algae. The zooecia 
are very large , ogival, separated by a salient thread ; the frontal is somewhat convex 
and perforated with numerous tremopores. The apertura is oval, elongated; two 
triangular cardelles separate a large semilunar anter from a smaller convex poster. 
On each side of the apertura are two salient avicularia with pivot, symmetrically 
placed. 
Measurements . — Apertura 
Venations . — As in all the species which are attacked by gigantism, a disease 
which the bryozoa as well as other organisms suffer, as shown by Larger, this 
also is quite variable in its micrometric measurements. Very often the zooecia are 
elongated, and the width oscillates between 0.70 and 0.80 mm. The length, some- 
what more constant, is never lower than 1 mm. On the dorsal face of the zoarium 
the zooecia have exactly the form of a more or less elongated lozenge. 
We are ignorant of the ovicell, but the generic determination does not offer 
any doubt. 
Affinities . — This species differs from Cheilopora saillans in its much larger 
micrometric dimensions and in its unilamellar zoarium. 
It differs from Cheilopora transversa in its elongated and nontransverse aper- 
tura. 
Occurrence . — Middle Jacksonian: Wilmington, North Carolina (common); 
3J miles north of Grovania, Georgia (rare) ; 4J miles southeast of Marshallville, 
Georgia (very rare). 
Cotypes. — Cat. No. 64174, U.S.N.M. 
CHEILOPORA SAILLANS, new species. 
Plate 68, figs. 9-11. 
Description . — The zoarium is free, bilamellar, formed of two lamellae, back 
to back, and more or less separable. The zooecia are distinct, elongated, lozenge- 
shaped, separated from each other by a thick, very salient thread; the frontal is 
somewhat convex and formed of a tremocyst on a thin perforated olocyst. The 
[Afl'=0.30mm. y . (Ls=l. 00-1.25 mm. 
l/d= 0.27 mm. OOeCia |/?=0.70-1.25 mm. 
