10 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 67 



accord with that of Gregory, but the zoarium is only 2 mm. in diam- 

 eter. In exterior aspect it corresponds still more to Discosparsa 

 cupula D'Orbigny, 1852, from the French Turonian, but our zoarium 

 is not free, as it incrusts a shell. 



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

 Switzerland. 



Plesiotype.— Cat. No. 69841, U.S.N.M. 



BERENICEA PARVULA, new species 



Plate 28, figs. 8, 9 



Description. — The zoarium encrusts sponges, in a small flabelliform 

 lamella. The tubes are distinct, very convex, separated by a deep 

 furrow, smooth, very small. The peristomes when broken are ellip- 

 tical but intact are orbicular and oblique, alwa3^s thin. 



Measurements. — Diameter of orifice, 0.06 mm.; diameter of tubes, 

 0.12 mm.; distance of peristomes, 0.32 mm.; separation of peristomes, 

 0.40 mm. 



Affinities. — This species is still smaller than Berenicea gracilis 

 Milne-Edwards, 1838. It is distinguished again by the rectilinear 

 form of the tubes and by its separation always superior to the 

 distance. 



The convexity of the tubes, the fiabellate arrangement, the great 

 saliency of the peristome, and the still smaller zooecial dimensions 

 do not permit confusion with Berenicea pulchella De Loriol, 1863. 



Occurrence. — Lower Cretaceous (Aptian) : Faringdon, England 

 (very rare) . 



Holotype.—Csit. No. 69842, U.S.N.M. 



BERENICEA PULCHELLA De Loriol, 1863 



Plate 28, fig. 4 



1863. Berenicea pulchella De Loriol, Les invert^br^s du Neocomien inferieur du 

 Mont Saleve pres Geneve, p. 135, pi. 16, fig. 9. 



Measurements. — Diameter of orifice, 0.10 mm.; diameter of tubes, 

 0.16 mm.; distance of peristomes, 0.40-0.48 mm.; separation of 

 peristomes, 0.48 mm. 



Affinities. — The type at the Museum of Geneva is not very well 

 preserved; our determination, based solely on the small micrometric 

 measurements, is therefore a little doubtful. The studied specimens 

 were incrusting Meliceritites. 



Occurrence. — Lower Cretaceous (Aptian) : Faringdon, England 

 (very rare). Lower Cretaceous (Valangian): Sainte-Croix (Vautl), 

 Switzerland. 



Plesiotype.— Cut. No. 69845, U.S.N.M. 



