NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
317 
Occurrence . — Upper Jacksonian (Ocala limestone) : Chipola River, east of 
Marianna, Jackson County, Florida (very rare) ; Old Factory, 11 miles above 
Bainbridge, Georgia (very rare). 
Ilolotype. — Cat. No. 64036, U.S.N.M. 
Genus ASPIDELECTRA Levinsen, 1909. 
Bibliography (Zoological) . — 1903. Nokman, Notes on the Natural History of East Finmark, 
Annals Magazine Natural History, ser. 7, vol. 12, pi. 8, fig. — 1909.' Levinsen, Morphological 
and Systematic Studies Cheilostomatous Bryozoa, pi. 160. 
“ The proximal part of the zooecium with one or two thick, projecting, hollow 
spines; the frontal shield perforated by slits: each distal wall with two multi- 
porous septular disks, and the distal half of each lateral wall with a single septula, 
the aperture in the frontal shield with an opercular valve; no avicularia ; no 
ovicell.” (Levinsen.) 
Fig. 88. — Genus Aspidelectra Levinsen, 1909. 
A-E. Aspidelectra melolontha Busk, 1852. A, B. Zooecium, X 20, and zoarium, natural size. 
(After Hindis, 18S0.) C. Lateral view of a zooecium, X 40. D. Lower side of the zoarium, X 
12. (C, D after Levinsen, 1894.) E. Structure of the costules. (After Norman, 1903.) 
Genotype. — Aspidelectra ( Lepralia ) melolontha Busk. 1852. 
Levinsen thought that this genus belonged to the Electrinidae. It is not rep- 
resented in the American Eocene, and we cite it to show how heterogeneous the 
Cribrilinidae are, and to suggest the importance of the ontogenetic works which 
might be undertaken on this subject. 
Family ACROPORIDAE Canu, 1913. 
The zooecia are indistinct and their frontal is thickened. The ascopore, per- 
forating the frontal, opens into the zooecia below the operculum. The ovicell is 
hyperstomial, deeply immersed and invisible exteriorly. The apertura is buried 
at the bottom of a long peristomie. There are some frontal avicularia and some 
peristomial avicularia. 
The characteristics of this family are not yet sufficiently studied; the recent 
specimens are rare and the sections made of the fossil forms are often difficult to 
interpret. 
