Measurements. 



NORTH AMERICAN EARLY TERTIARY BRYOZOA. 721 



DESMEPLAGIOECIA (ACTINOPORA) TENUIS Reuss. 1869. 



Plate 155, figs. 1-6. 



3SG4. Dcfrancia iimiiosticha REUSS, Ueber Anthozoen und Bryozooii der Mainzer Tertiiir- 

 beckens, Sitzungsbericlite der k. Akademie der Wissenschaften, Wein, vol. 50, p. 11, 

 pi. 3, fig. 1. 



1809. Discospnrsa tennis REUSS, Palaontologische Studien tiber die alteren Tertiiirschichten 

 der Alpen, Crosaro, Denkschriften der k. Akademie der Wissenschaften, Wien, 

 vol. 29, p. 280, pi. 34, figs. 9, 10. 



1869. Discosparsa regvlaris REUSS, Idem, p. 280, pi. 34, fig. 11. 



1887. Discosparsa tennis PERGENS, Note preliminaire sur les Bryozoaires fossiles de 

 environs de Kolesvar, Bulletin de la Socit(? royale Malacologique de Belgique, 

 vol. 22, p. 37. 



1892. Diastopora. tennis WATERS, North Italian Bryozoa, Cyclostomata, Quarterly Jour- 

 nal of the Geological Society of London, vol. 47, p. 154. 



Description. The zoarium is free, discoidaJ, pedunculate or not. The fascicles 

 are salient, very close together, arranged radially, almost continuous. The tubes 

 are indistinct; the peristome is orbicular Or quadrangular. The ovicell is very 

 long, convex, parallel to the zoarial margin. The zone of growth is narrow. The 

 lower face is concave, striated concentrically. 



Diameter of the peristome 0.13 mm. 



Separation of the fascicles '. 0.13 mm. 



Diameter of the zoaria 3.00-6.00 mm. 



Affinities. Our determination has been based on the figures and not upon 

 German specimens. In aspect our figures are similar to those of Defrancia mo-no- 

 sticha Reuss, 1864, but the American zoaria are larger. We see no difference from 

 Discosparsa tennis Reuss, 1869. 



This species differs from Desmeplagioecia brevis in its fascicles, which are con- 

 tinuous and not interrupted, and in its free zoarium. It differs from Desme- 

 plagioecia tenuissima in its larger zoarial diameter. 



Occurrence. Vicksburgian (Marianna limestone) : One mile north of Mon- 

 roeville, Alabama (common). 



Geological distribution. Priabonian of Vicentin (Reuss, Waters) and of 

 Kolosvar (Pergens) ; Rupelian of Germany (Reuss). 



Plesiotypes.Cat. No. 65459, U.S.N.M. 



DESMEPLAGIOECIA (ACTINOPORA) TENUISSIMA, new species. 



Plate 126, figs. 8-10. 



Description. The zoarium is discoidal, free or incrusting shells, eccentric. 

 The fascicles are very thin, arranged radially, very salient, discontinuous. The 

 tubes are invisible; the peristome is thin, orbicular, or rectangular. The ovicell is 

 very long, thin, little convex. The zone of growth is thick and rather wide. 



Diameter of peristome 0.08 mm. 



Measurements. 



Separation of the fascicles 0.12-0.15 mm. 



Diameter of the zoaria 0.7 mm. 



55899 20 Bull. 106 46 



