THE HEDERELLOIDEA — BASSLER 61 



The zooecial diameter is similar to that in H. raaschi, but the 

 bilinear arrangement and quite different method of branching will 

 serve to distinguish H. curta. 



Occurrence. — Onondaga (Upper Jeffersonville hmestone-Spirifer 

 acuminatus bed): Falls of the Ohio. 



Holotype.— U.S.N. U. No. 54089. 



HEDEROPSIS LONGITUBA. new species 



Plate 14, Figure 8 



This species is readily recognized by its long zooecial tubes and by 

 the well-marked carina or longitudinal septum on their basal wall. 

 The zooecia bud alternately from the main axis at such a low angle 

 that for a portion of their length they remain in contact and then 

 diverge shghtly. The tubes are unusually long, 4 mm. in length and 

 0.66 mm. in diameter with 1 or 2 in 5 mm. As usual the main axis 

 persists for some distance before ending as a zooecium and giving rise 

 to another tube, which continues as the axis. The zooecia also are 

 rather rounded and tend to become detached from the substratum. 

 In budding they frequently cross the main axis or otherwise depart 

 from normal regularity. However, in normally growing zoaria definite 

 branching occurs at intervals of about 6 mm. The apertures are 

 terminal, broadly elliptical, with the median carina plainly visible 

 within them. 



Occurrence. — Onondaga (Upper Jeffersonville limestone-S'jpinyer 

 acuminatus bed): Falls of the Ohio. 



Holotype.—V.S.N.M. No. 87889. 



Genus REPTARIA Rolle, 1851 



Reptaria Roll:^, in Leonhard and Bronn, Neues Jahrbuch, p. 810, 1851. — Hall 

 and Simpson, Pal. New York, vol. 6, p. 25, 1887. — Miller, North Amer. 

 Geol. Pal., p. 320, 1889. — Simpson, 14th Ann. Rep. State Geol. New York, 

 1894, p. 599, 1897.— Grabau, Bull. Buffalo Soc. Nat. Sci., vol. 6, p. 178, 1899.— 

 Nickles and Bassler, U. S. Geol. Surv. Bull. 173, p. 21, 1900. — Prantl, 

 Acta Musei Nationalis Pragae, vol. 1 (B), p. 80, 1938. 



Ptilioneila Hall, Trans. Albany Inst., vol. 10, p. 599, 1883 (abstract, p. 195, 1881). 



Bryozoon Barrande, Syst. Sil. Centre Boheme, Cephalopoda, vol. 11, pi. 248, 

 1868. 



In this genus the cyhndrical annulated zooecia are all alike in shape 

 and length and arise alternately from the basal part of the preceding 

 one at a low angle and with such regularity as to remain in contact 

 almost their whole length, and furthermore the branches divide so 

 uniformly that the zoarium altogether has a featherlike aspect. 

 The regularity of budding gives the impression that the zooecia arise 

 from a central line, but this is not true, since well-preserved examples 



