NORTH AMERICAN EARLY TERTIARY BRYOZOA. 



179 



AETEA ANGUINA ? Linnaeus, 1758. 



Date 32. figs. 2. 3. 



S. Hi-i-titliii-iii inif/niiiii I.INXAKI s. Sysii'iiiM Naturae. eel. H>. p. Mil. 

 1880. Actcn iiiiiiiiiini JF.LI.V. Synonymi.- Catalogue Marine Bryozoa, p. 3 (cites general bib- 



liography). 



1913. Aftt-u inifjnina CANT, Menmires de 1'Iiistitut Kgyptien, vol. 0. p. 100 (cites paleonto- 

 logic bibliography). 



H 2S 



H X2S B 85 



FIG. 47. Family Aeteidae Smitt, 18G7. 



A-C. Acted uiif/iiina Linnaeus, 1758. A. Portion of a zoarinm, X 30, illustrating structure. 

 (After Robertson, 1905.) ad, adlieiviit pdriimi: ;ir. groove; HICIII. ii/i. rueinliraneous aperture: 

 op, operculum ; pd, polypide ; scp, septum: tit. tubular part of the zooecia ; .coe, zooecinm. B. 

 Sketch, X 85, showing the ovicell (ori ar the end of the tubular projection; the retractor 

 muscles (nn.) attached just below the tentacles, and also attached at the other end near the com- 

 mencement of the basal expansion where the ova Ha ( "</ ) also occur. C. Front view. X 250. 

 showing the operculum and tentacular sheath ( /.< I to which the muscles are attached. (B, C 

 after Waters, 1913.) 



D-H. Aetea recta Hincks, 1862. P. lirawing. X 2.~i. 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 

 tills up most of the lower portion of the /.ooprhiiu. and the tubular prolongation which is bent back 

 carries an ovicell. H. Sketch, X 25. slum-ing the position of the polrpide in the zooecium. i 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 -\< tea <tiin(iia. Moreover. 



