ART. 22. (YCLOSTOMATOUS BEYOZOA — CANU AND BASSLEE. 43 



Affinities.— Thi& species differs from Plagioecia compressa D'Or- 

 bigny, 1852, not only in the nature of the ovicell, but also in the 

 absence of a median furrow on the tubes ; the zoarial aspect is identi- 

 cal and confusion between the two species is always possible without 

 attentive obsen^ation. 



Very often the distance and separation of the peristomes are very 

 close measurements. Here on the contrary they are quite different, 

 the visible length of the tubes being very large. It is the same in 

 Diaperoeda laxipora D'Orbigny, 1852. D. turonica differs however 

 from this species in its larger peristome (0.12 instead of 0.10 mm.) 

 and in its less zooecial length never attaining 0.70 mm. 



There are some specimens affecting the zooecial arrangement of 

 Reticulipora: this is the result of the distorting of the lamellae, the 

 growth being always exterior. 



Occii7'rence.—Cveti\c(>o\\ii (Turonian) ; Ruille Ponce (Loir-et- 

 Cher), France. 



Coti^pes.—Cnmi collection and Cat. No. 68922, U.S.N.M. 



DIAPEROECIA LAXIPORA D'Orbigny, 1853. 



1853. Mcscntenijora hi.ciijora d'Okhigmy. Pnleontologie franoaise, Terrain 



Cretace, vol. 5, p. 812, pi. 756, iigs. 14-17. 

 1890. Mescnteripora laxipora Pergens, Revision des Brj'ozoaires du Cretac§ 



fiRui'es i>ar D"Orl)if:ny, Bulletin de la Societe beige de Geologie, vol. 3. 



p. 869. 



I Diameter of peristomes 0.10 mm. 



Distance between peristomes. 0. 70-0. 80 mm. 

 Separation of peristomes .40 mm. 



Affinities.-— We have discovered the ovicell of this species and find 

 it is identical with that of Diaperoccia turonica, but with somewhat 

 smaller dimensions ; we do not believe it is of any use to figure it. 



This species is perfectly characterized by its great zooecial length, 

 ^wice the separation of the peristomes. The zooecia are little dis- 

 tinct; however, it is not rare that they are bordered laterally by a 

 thin salient thread which causes them to resemble those of Diaperoe- 

 cia turonica. Confusion between the two species is not possible be- 

 cause of the great micrometric differences. 



Occurrence. — Cretaceous (Santonian) : Eomorantin (Loir-et-Cher), 

 France. 



Geological distrihution.—Conmcmn of France (D'Orbigny). The 

 Maestrichtian locality of Royan is cited in the Paleontologie fran- 

 raise, but Canu has not found this species there. 



DIAPEROECIA SAILLANS, new species. 



Plate 8, figs. 12. 



/description. — The zoarium is flabelliform or orbicular; ana m- 

 (■nists bryozoa (Cosci no pleura). The tubes are large, little visible in 



