32 PROCEEDINGS OF THE NATIONAL MUSEUM, vol.61. 



stome=0.3() mm. and transversal diameter=0.40 mm.). The bibli- 

 ography of this species given by Gregory in 1899 is absolutely false. 



Geological distribution. — Cretaceous (Coniacian) : Tours (Indre- 

 et-Loire), St. Paterne and Connerre (Sarthe), Villedieu (Loir-et- 

 Cher), and Les Phelippeaux (Charente), France. 



Cretaceous (Santonian) : Vendome (Coulommiers) and Bedocheau 

 (Charente), France. 



Cretaceous (Maastrichtian) : D'Archiac (Charente), France. 



Genus CAVARIA Hagenow, 1851. 



1851. Cavaria Hagenow, Die Bryozoen der Maastrichter Kreidebildung. 

 p. 53. 



Plagioeciidae in which the ovicell is globular, transverse, arranged 

 perpendicularly to the zooecial axis and aborting many of the tubes. 

 The tubes are cylindrical, with peristome, and with dorsal gemma- 

 tion on the basal lamella. The zoarium is cylindrical, hollow, often 

 with diaphragms irregularly placed in the interior. 



Genotype. — Cavaria pustulosa Hagenow, 1851. 



Range. — Maastrichtian, Danian. 



HistoHcal. — Hagenow applied the term Cavaria to zoaria, which 

 were hollow and had diaphragms in the interior. This characteristic 

 is very inconstant and may be often observed in Entalophora forms of 

 growth and more frequently in the Ascosoeciidae. Quite often, es- 

 pecially on little complete zoaria, this character is only partially de- 

 veloped. This zoarial form pi'obably corresponds to some kind of 

 symbiosis on a marine alga. 



The first species described by Hagenow is Cavaria ramosa., which 

 was chosen in 1887 by Marsson as the type of his genus Cavarinella, 

 referred by us to the Ascosoeciidae. Gregory was therefore in error 

 in 1899 when he chose this species as the type of the genus Cavaria. 

 Moreover, the section which he publishes does not conform to that of 

 Marsson. The second species, Cavaria pustidosa., here chosen as the 

 genotype, has afforded characters upon which we have established 

 the above diagnosis. Gregory in 1899 classed the genus in the 

 Ditstoporidae, which, however, is not a natural family. 



CAVARIA PUSTULOSA Hagenow, 1851. 



Plate 5, figs. 6-8. 



1851. Cavaihi pustulosa Hagenow, Die Bryozmni der Maastrichter Kreide- 



bildung, p. 54, pi. 6, tig. 2. 

 1887. Cavaria pustulosa Marsson, Die Bryozoen der weissen Sclireilikreide 



der Insel Riigen, Palaeontologische Abhandlungen, vol. 4, p. 18, pi 1, 



fig. 5. 



