ART. 22. CYCLOSTOMATOUS BRYOZOA CANU AND BASSLER. 59 



in the same locality (Royan) have been compared with those in the 

 Museum of Natural History of Paris ; they are ovicelled. The ovicell 

 is placed laterally on the zoarium. It is limited, smooth, very 

 globular. 



This species differs from Osculipora tmncata Goldfuss, 1827, in 

 which the branches are also cylindrical, in its transverse (and not 

 cylindrical) fascicles which are closer together. It differs from 

 Osculipora repens Hagenow, 1851, in its cylindrical branches, its 

 fascicles much closer together, and its ovicells placed laterally. The 

 branches are not always as slender as those studied by D'Orbigny, as 

 we have some which are very vigorous. 



Occurrence. — Cretaceous (Campanian) : Montmoreau (Charente), 

 France. 



Cretaceous (Maastrichtian) : Royan (Charente Inferieure), France. 



Plesiotype.—Csinu collection and Cat. No. 68982, U.S.N.M. 



DIPLODESMOPORA, new genus. 



Greek, Diplos, double; desmos, fascicle. Alluding to the double 

 row of tubes in the fascicles. 



The ovicell is limited, globular, smooth, margined, placed later- 

 ally. The tubes are funnel shaped, fasciculated, with peristomes 

 in linear fascicles ; they grow by dorsal gemmation. The zoarium has 

 no basal lamella, but it has a thick dorsal covering formed of nemato- 

 pores with thick walls. 



Genotype. — Biplodesviopora opposita., new species. Coniacian, 

 Maastrichtian. 



Affinities. — Exteriorly this genus much resembles Bituhigera D'Or- 

 bigny, 1851, in which, however, the ovicell is not known. It differs 

 from it in its widened tubes (club shaped and not cylindrical) and 

 in the presence of nematopores instead of tergopores. The presence 

 of nematopores gives a conical aspect to the zone of growth, a char- 

 acter which does not exist in Id/manea. 



In its biserial fascicles and its nematopores Diplodesmopora re- 

 sembles the genus Osculipora D'Orbigny, 1849, but differs fioiii it in 

 its widened and not cylindrical tubes. 



Certain branches are exactly like those of Idinonca or Idmidronca. 

 These zoarial forms are quite common and observable in different 

 families. The ovicell is totally different from that of the genus 

 Idmonea as it is now maintained. Moreover the dorsal nematopores 

 are adventitious tubes absolutely contrary to the firmatopores of 

 Idmidronea. They are buried in the epitheca, but they are open 

 and visible in the zone of growth at the end of the branches. 



The genus differs from Truncatula Hagenow, 1851, which is also 

 provided with nematopores by its tubes with peristomes and grouped 

 in fascicles and not in pinnules. 



