66 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.61. 



TRUNCATULA SUBPINNATA D'Orbigny. 1854. 



Plate 25, figs. 3-5. 



1854. Truncatula siibpinnata d'Oebigny, Paleontologie frangaise, Terrain 



Cretacd, vol. 5, p. 1055, pi. 796, figs. 6-9. 

 1889. Trvncatula stihpinnata Pergens, Revision des Bryozoaires du Cretac6 



figures par d'Orbigny, M6moires de la Soci6t6 Beige de G^ologie de 



Pal§ontologie et d'Hydrologie, vol. 3, p. 385. 



/Structure. — We have found very beautiful specimens which have 

 permitted us to study the structure. The nematopores are often 

 closed by a calcareous pellicle, they are large, elongated, and parallel 

 to the zoarial axis. Tlie ovicell is globular, margined, and smooth. 



In transverse section the tubes are much smaller toward the dorsal ; 

 they are then enlarged and with dorsal gemmation; the dorsal is 

 thick and perforated with nematopores. 



In longitudinal section the tubes are club shaped with dorsal gem- 

 mation. The nematopores are long, with thick walls; they form a 

 thick zoarial Avail by their consolidation. 



The apertures are little visible on the frontal ; they open chiefly on 

 the dorsal and along the entire length of each pinnule. The zoarial 

 base is a small flat disk twisted like a crank. 



Afflmties. — This species differs from Truncatula ijinnata Roemer, 

 1840, in its smaller zoarial dimensions and in its dorsal ribs, in its 

 nematopores larger and arranged parallel to the zoarial axis (and not 

 obliquely) and in its more globular ovicell. 



It differs from Truncatula tetragona Michelin, 1846, in its small 

 zoarial dimensions, its less numerous nematopores arranged parallel 

 to the zoarial axis. 



Occurrence. — Cretaceous (Cenomanian) : Le Mans (Sarthe), 

 France. Cretaceous (Turonian) ; Duneau and Connere (Sarthe), 

 France. 



Plesiotypes.—CiMm collection and Cat. No. 68988, U.S.N.M. 



TRUNCATULA TETRAGONA Michelin, 1846. 



Plate 26, figs. 8-11. 



1846. Idmonea tetragona Michei.in, Iconographie zoophytologiqne, p. 219, 



pi. 53, fig. 19. 

 1854. Truncatula tetragona d'Orbigny, Paleontologie frangaise, Terrain 



Cretacg, vol. 5, p. 1056, pi. 796, figs. 10-14. 

 1889. Truncatula tetragona I'ergens, Revision des Bryozoaires du Cretacft 



figures par d'Orbigny, Memoires de la Soci4t4 Beige de G6ologie de 



Paleontologie et Hydrologie, vol. 3, p. 385. 

 1897. Trunca.tula tetragona Canu (not Canu 1900 and 1903), Bryozoaires 



du Turonian de St. Calais, Bulletin Soei6t6 Geologique de France, ser. 



3, vol. 25, p. 748. 

 1909. Homoeosolcn tetragonus Gregory, Catalogue Fossil Bryozoa in Brit- 

 ish Museum, Cretaceous, p. 72 (not synonymy). 



