NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
179 
AETEA ANGUINA ? Linnaeus, 1758. 
Plate 32, figs. 2. 3. 
175S. Sertularia anguina Linnaeus. Systema Naturae, ed. 10, p. 816. 
1889. Aetea anguina Jelly, Synonymic Catalogue Marine Bryozoa, p. 3 (cites general bib- 
liography). 
1913. Aetea anguina Canu, Memoires de l’lnstitut Egyptien, vol. 6, p. 190 (cites paleonto- 
logic bibliography). 
A-C. Aetea anguina Linnaeus, 1758. A. Portion of a zoarium, X 30, illustrating structure. 
(After Robertson, 1905.) ad, adherent portion; gr, groove; mem. ap, membraneous aperture; 
op, operculum ; pd, polypide ; scp, septum ; tu, tubular part of the zooecia ; zoe, zooecium. B. 
Sketch, X 85, showing the ovicell ( ov ) at the end of the tubular projection; the retractor 
muscles (m) attached just below the tentacles, and also attached at the other end near the com- 
mencement of the basal expansion where the ovaria ( oa ) also occur. C. Front view, X 250. 
showing the operculum and tentacular sheath (ts) to which the muscles are attached. (B, C 
after Waters, 1913.) 
D-H. Aetea recta Hincks, 1862. D. Drawing, X 25, showing ovicell at end of tubular part 
of zooecia. E, F. Two sketches of ovicells, X 85. G. Sketch, X 85, showing that the ovarium 
fills up most of the lower portion of the zooecium, and the tubular prolongation which is bent back 
carries an ovicell. H. Sketch, X 25, showing the position of the polypide in the zooecium. (D-H 
after Waters, 1897.) 
On the fossils we seldom find more than the creeping portions of the zooecia, 
which give the appearance of a network of false stolons; the free part then lying 
on the substratum becomes fossilized very rarely. We have found two zoaria which 
in the thickness of their zooecia appear to correspond to Aetea anguina. Moreover, 
