16 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. «1. 



oeciostome. Rare and slender in the Cenomanian, it is vigorous and 

 abundant in the Turonian. 



Geological distHhution. — Cretaceous (Cenomanian) : Le Mans 

 (Sarthe), Montlouet (Maine-et-Loire), France. 



Cretaceous (Turonian): Les Janieres and St. Calais (Sarthe). 

 Ruille Ponce (Loir-et-Cher) and Parnay (Indre-et-Loire), France. 



Cotype8.—C2imx collection and Cat. No. 68907, U.S.N.M. 



MECYNOECIA MICROPORA D'Orbieny. 1853. 



Plate 2, fig. 1. 



1853. Laterotubigera micropora d'Oebignt, Paleontologic frangaise, Ter- 

 rain Cr^tace, p. 719, pi. 754, figs. 12-14. 



1889. Spiropora macropora var. micropora Peegens, Revision des Bryo- 

 zoaires du Cretac6 figures par D'Orbigny, Memoirs de la Society Beige 

 de G^ologie de Pal6ontologie et d'Hydrologie, Bruxelles, vol. 3, p. 365. 



1890. Spiropora macropora var. micropora Pkbgens, Nouveaui bryozoaires 

 Cyclostomes du Cr6tac6, Bulletin de la Soci^tS Beige de G6ologie, vol. 

 4, Mgmoires, p. 205. 



Aflnities. — In 1890 Pergens identified Laterotuhigera mia'opora 

 D'Orbigny, 1853, with Semilaterotubigera annulata of the same 

 author. This was an error which was occasioned by the the great 

 confusion which existed in the tubes of specimens in D'Orbigny's col- 

 lection and the poor illustrations of the French author. Considera- 

 tion of the ovicells permits us to clear up this confusion. 



The peristome is orbicular (and not transverse) ; it measures only 

 0.14 mm. in dimension (and never 0.18 or 0.20 mm.). The trans- 

 versal diameter is only 0.20 mm. (and not 0.26 mm.). The oviccll 

 is an elongated and quite large sac, of which unfortunately we have 

 not observed the oeciostome. 



This is the smallest of the species in which the tubes are grouped 

 in transversal rows. 



Geological dlst7ibution. — Cretaceous (Coniacian) Villedieu (Loir- 

 et-Cher), Tours and St. Paterne (Indre-et-Loire), and Fecamp 

 (Seine inferieure), France. 



Plesiotypes.— Cat. No. 68908, U.S.N.M. 



MECYNOECIA (?) ANNULOSA Michelin, 1847. 



Plate 2, fig. 2-10. 



1896. Spiropora annulosa Gkegoey, Catalogue Jurassic Bryozoa in British 

 Museum, p. 146, pi. 8, fig. 5 (Bibliography). 



1898. Spiropora annulosa Canxj, liltude sur les ovicelles des Bryozoaires du 

 Bathonian d'Occaigues. Bulletin de la SociC't6 g§ologlque de France 

 ser. 3, No. 26. p. 281, figs. 16, 17, 18, 19, 20. 



1914. Entalophora {Spiropora) annulosa Waters, The marine fauna of 

 British East Africa and Zanzibar, Proceedings of the Zoological So- 

 ciety of London, p. 842. 



