NORTH AMERICAN KARJLY TERTIARY BRYOZOA. 185 



In 1S47 Keuss discovered in the Vienna Miocene a species which he called 



In 18-47 Eeuss discovered in the Vienna. Miocene a species which he called 

 Vieentin. Italy, in 1S09. In comparing the excellent figure- of Waters with the 

 more reliable illustrations published by Keuss in 1874, it becomes probable that we 

 are dealing with two distinct species. In 1875 Manzoni believed he had discovered 

 the x<Ti<-i><>n-ll,ii'i<i t'H!i>tica Keuss, 1874, in the Italian Plaisancian: his imperfect 

 figure certainly led Sequenza and Xeviani later into error. Finally the latter 

 figured in 1900, still under this same name, a species undoubtedly distinct. The 

 great geological distribution given by various authors to Xcri/i>(tc<:llaria elliptica 

 appears then to be erroneous. 



In 1887 Pergens identified Keuss's species with Sc-rtt /><><< Uttria x< t'uposa Lin- 

 naeus, 1758. This was an erroneous identification which, followed by Miss Jelly, 

 introduced a grave error in her Synonymic Catalogue of Marine Bryozoa. In 1880 

 Hincks believed he had found the same species living in English waters, but Waters 

 thought that these specimens belonged to Scrupocellaria in* ///</'.* Xorman. 



Our specimens agree with the figures published by Waters in 1891. Under 

 the circumstances we believe it best to separate the Eocene species under the name 

 Scrupoccllaria elliptica Keuss, 1869. Future studies will be necessary before the 

 status and name of the Miocene species can be determined. 



Description. The small frontal avicularium is rather constant and is without 

 a pivot. The same features hold for the distal avicularium. The dorsal vibracu- 

 lum is transverse, conforming to the figure given by Waters. Immediately below 

 this is the radicular pore. The impression of the scutum is visible. The micro- 

 metric measurements are as follows: 



. [Z2=0.46-0.50 mm. . (#0=0.24-0.28 mm. 



Measurements. /ooecia , ( mesia , 



[fe=0.18-0.20 mm. \lo= 0.10-0. 1-2 mm. 



Occurrence. Middle Jacksonian: Wilmington, North Carolina (very rare); 

 near Lenuds Ferry, South Carolina (very rare). 



Geological distribution. Priabonian of Vicentin, Italy (Keuss. Waters), and 

 possibly in the Rupelian of Gaas, France (Keuss). 

 Csit. Xos. 03950, 63951, U.S.X.M. 



SCRUPOCELLARIA GRACILIS Reuss. 1869. 



Plate 32. figs. S, 9. 



I860. Scruiiwrllitriit (iracilis REUSS, Die fossilen Anthozoen nnd Bryozoen cler Schichten 

 gruppe von Crosaro. Deukscliriften Uer U. Akartemie der \\ issenscliaften, Wien. 

 vol. 29, p. 260, pi. 29, fig. 4. 



1891. Xi-rtiixirclliiriii iinicilis WATERS, North Italian Bryozon. Qunrtt-ri.v Journal Geological 

 Society, London, vol. 47, p. 0, pi. 1, figs. 12, 13. 



Comparison of our photograph with the figures published by Waters shows 

 (he great similarity of the American specimens with Serupocellaria gracilis. The 

 dorsal vibraculum is small and longitudinal. The figured segment bears no trace 

 of the scutum. At its base are zooecia which have undergone total regeneration. 



