100 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.61. 



The tubes are cylindrical, with vesicular walls; they ramify at all 

 heights. The shorter are closed by a calcareous membrane and are 

 thus transformed into dactylethrae little numerous and appeariufr 

 between the tubes in the tangential sections. 



The vesicular walls of the tubes are absolutely similar to those 

 which Waters, 1904, has figured for H. claviformis of recent seas. 



Occurrence. — Lower Cretaceous: Albian of Grandpre (Ardennes) 

 (D'Orbigny) ; Aptian of Ervy, France (Canu collecti 



Plesiotype. —i^'iit. No. 68960. U.S.N.M. 



;ion . 



LEIOSOECIA PARVICELLA Gabb and Horn, 18G0. 



1860. Multicrescl^ parviceUa Gabb and Horn, Descriptions of new Creta- 

 ceous corals from New Jersey, Proceedings, Academy of Natural 

 Sciences, Philadelphia, p. 367. 



1860. Multicrescis parviceUa Gabb and Horn, Descriptions of new species 

 of American Tertiary and Cretaceous fossils, Journal Academy of 

 Natural Sciences, Philadelphia, ser. 2, vol. 4, p. 401, pi. 69, figs. 36-38. 



1862. Multicrescis parviceUa Gabb and Horn, Monograph of fossil Polyzoa 

 of Secondary and Tertiary formations of North America, Journal Acad- 

 emy of Natural Sciences Philadelphia, ser. 2, vol. 5, p. 178. pi. 21, fig. 70. 



1907. Heteropora parviceUa Ui.rich and Bassler, Cretaceous Paleontology 

 of New Jersey, Geological Survey, New Jersey, Paleontology, vol. 4, p. 

 327, pi. 23, figs. 1, 2. 



1920. Leiosoeeia parviceUa Canu and Bassler, North American Early Ter- 

 tiary Bryozoa, Bull. 106, U. S. National Museum, p. 824, fig. 273. 



Although figured in our work of 1920, this species was not de- 

 scribed, and we therefore take the present opportunity to give a few 

 notes concerning it. 



The tubes are cylindrical, with peripheral gemmation (by bifurca- 

 tion), very irregular. The ovicell is globular, salient, orbicular, sur- 

 rounding five or six aborted tubes ; the walls are smooth. 



This species is so irregular that we have not been able to obtain 

 a good longitudinal section, so that we do not know exactly the na- 

 ture of the adventitious pores ; according to the fractured specimens 

 and tangential section, they appear to be mesopores of equal length. 



Occurrence. — Cretaceous (Vincentown) : Vincentown, New Jersey. 



Pledotype.—C2it. No. 68950, U.S.N.M. 



LEIOSOECIA OCCLUSA, new species. 

 Plate 22, figs. 16, 17. 



Description. — The zoarium is free, claviform; it seems exteriorly 

 to be formed by many superposed subcolonies. The walls of the 

 tubes are thin ; the apertures are large and polygonal. The ovicell is 

 orbicular, deeply embedded, a little convex. An epitheca partially 

 closes certain zones of apertures. 



