NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
195 
We have added Heterocella Canu, 1907, to this family because it is not yet ad- 
visable to create a distinct family for it. 
Genus NELLIA Busk, 1852. 
1852. NelUa Busk, Catalogue Marine Polyzoa, British Museum, Cheilostomata, pt. 1, p. IS. 
The zoaria are jointed. The zooecia are without spinous processes; the distal 
wall has at its inner corner a single septula ; the ovicells are in almost their whole 
D *73 
Fig. 51. — Genus Nellia Busk, 1852. 
A-H. Nellia oculata Busk, 1852. A, B. Segment, X 20 and a zooeeium X 40. (After Smitt, 
1872.) C. Fragment, X 40. The two proximal zooecia to the left without ovicell. An avicularian 
chamber is seen through one of the lateral walls of the middlemost zooeeium. D. A zooeeium with 
ovicell, X 75. An uncalcified transverse belt is present. E. A longitudinal section through an 
ovicell, X 40. F. An avicularium with pit for the insertion of the radical fiber, X 200. (G-F, 
After Levinsen, 1909.) G, H. Stalk growing from stolon, X 25. The growth is from a spreading 
stolon from which, at intervals sub-colonies grow, commencing with short calcareous nodes joined 
by chitinous tubes, X 25. (After Waters, 1913.) av, avicularia ; ov, ovicell; op, operculum; opi, 
opesia ; pr, radicular pore ;, rd, radical fiber. 
extent immersed into the proximal part of the ordinary zooeeium and project only 
very little on the surface of this. The avicularia are attached by a wide base or 
partially immersed with calcareous transverse pivot. (After Levinsen, 1909.) 
12 tentacles. 
Genotype. — N ellia oculata Busk, 1852. 
Range. — Jacksonian-Becent. 
The genus Nellia of Busk is not the genus FarcimAa of Pourtales. The type 
of the latter, Farcvmia cereus Smitt, 1872, requires further examination. 
