58 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 6t 



The young zoaria are berenicoid, like the one we have figured. 

 Waters discovered the oviceil and has sent us a drawing, which we 

 reproduce. The oviceil is an ovoid capsule with limited outlines, 

 interrupting the fascicles. It belongs to the group of the Cytisidae, 

 although somewhat smaller. 



, This species has been chosen as the type of the genus Actinopora 

 D'Orbigny, 1853, by Gregory, 1909. The fascicles are multiserial. 

 Canu, 1917, discovered the oviceil oi Actinopora cojnplanataKoemeTf 

 1840 { = organisans D'Orbigny, 1851). It is of the type Plagioecia. 

 The fascicles are uniserial. 



Under these circumstances it is necessary, then, to maintain in 

 the Cytisidae (or Theonoidae) the multiserial species (genus Actino- 

 pora) and in the Plagioeciidae the uniserial species (genus Discotubi- 

 gera) . 



We still maintain the genus Desmeplagoecia, as it is not certain 

 that all of the Discotubigera have the same oviceil. 



Occurrence. — Lower Cretaceous (Valangian) : Sainte-Croix and 

 Villers-le-Lac, Switzerland. 



Plesiotype.— Cat. No. 69906, U.S.N. M. 



Genus MULTITUBIGERA D'Orbigny, 1853 



1853. Multihibigera D'Orbigny, Paleontologie francaisc. Terrain Cretace, vol. 5, 

 p. 767. 



Theonoidae with a compound zoarium composed of many confluent 

 Actinopora. 



Genotype. — Multituhigera gregaria D'Orbignj^, 1850. Cretaceous. 



MULTITUBIGERA CAMPICHEANA D'Orbigny. 1853 



Plate 6, figs. 4-8 



1853. Multituhigera campicheana D'Orbigny, Paleontologie francaise. Terrain 

 Cr^tac^, vol. 5, p. 768, pi. 763, figs. 10-13. 



The oviceil is a small ovoid capsule with definite outlines, inter- 

 rupting an intermediate fascicle between two other complete ones. 

 It is analogous to that of Actinopora stellata Koch and Dunker, 1837; 

 it belongs to the group of the Cytisidae, although a little smaller. 

 The zoaria of this genus are formed of confluent Actinopora. 



The general form is quite variable. Very often the zoarium is 

 flabelliform and formed of two incomplete subcolonies united by 

 their dorsal. Again the zoarium remains flabeUiform and formed 

 of three disks of Actinopora. Finally, the zoarium may form an 

 irregular mass measuring as much as 3 centimeters in diameter and 

 containing as many as eight confluent subcolonies. In all these cases 

 the base is an edge more or less thin which does not permit one to 



