110 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.61. 



also the sections are not identical for there is no internal basal 

 lamella. 



Occurrence. — Miocene (Helvetian) : Doue-la-Fontaine (Maine-et- 

 Loire), France. 



Geological distribution.— Tortonian of Austria Hungary (Reuss). 

 Plaisancian of England (Busk). 



Plesioty pe.—Csinu collection and Cat. No. 68956, U.S.N.M. 



TRETOCYCLOECIA (HETEROPORA) PELLICULATA Waters. 1879. 

 Plate 13, figs. 9, 10. 

 1910. Heteropora pelliciilata Robertson, Cyclostoiuatous Bryozoa of the 

 West Coast of North America, University of California publications, 

 vol. 6, p. 258, pi. 25, figs. 51-55 (bibliography). 

 1920. Heteropora pelUculata Canu and Bassler, North American Early 

 Tertiary Bryozoa, Bull. 106 U. S. National Museum, p. 681, figs. 222, 

 J, K, L (sections). 

 In 1920 we published thin sections of this species, and we are now 

 able to illustrate its ovicell, showing it to belong to the genus Treto- 

 cycloecia. At the extremity of the tubes the walls are vesicular; 

 the vesicles are small and visible in tangential sections. The tubes 

 are cylindrical with peripheral gemmation. 



The ovicell is that of Tretocycloecia, but more irregular. We still 

 have no knowledge of the anatomical details of this species, and it is 

 hoped that living specimens will soon be dredged, so that we will 

 be able to complete our studies of this remarkable genus in which 

 the fossil representatives are very numerous. 



Occurrence. — Recent: Japan, Australia, New Zealand, etc. Our 

 specimens are from Neah Bay, Washington. 

 Plesiotypes.—Csit No. 7377, U.S.N.M. 



TRETOCYCLOECIA SABAUDICA, new species. 



Plate 18. figs. 5-9. 



Description. — The zoarium is large, free, reticulate, with short, 

 cylindrical branches growing in all directions. The tubes are cylin- 

 drical; the peristome is thin and little salient. The mesopores are 

 numerous and often closed by a calcareous lamella. The ovicell is 

 large, orbicular, little convex, surrounding a large number of tubes. 



Occurence. — Cretaceous (Greensand) : Chamboy (?France). Type 

 collected by Carl Rominger many years ago at a now unlocated local- 

 ity marked Chamboy. 

 ' Holotype.— Cat. No. 68958, U.S.N.M. 



Genus ALVEOLARIA Busk, 1859. 



1859. Alveolaria Busk, Monograph Fossil Polyzoa of the Crag, Publica- 

 tions Paleontographical Society, London, vol. 14, p. 128. 

 The tubes are cylindrical; mesopores are absent. The zoarium is 

 an aggregation of cup-shaped bodies adjacent to each other by their 



