210 
PEEGEN SELLA. 
Apertures in the median series in rows of from three to four ; 
the rows are crowded. Apertures in the lateral series in 
rows of from three to eight ; the apertures are small and 
closely packed. 
Distribution. 
Senonian — Maastrichtian : Maastricht and Bemelen, in Maastrichtcr 
Kreide. 
Figuees. 
Fig. 19. Part of the obverse face of a zoaiium, showing the 
junction of the lateral and median series of apertures; X 10 dia. 
Maastrichter Kreide : Maastricht. Van Breda Coll. D. 3379. 
Fig. 19. 
Pergensella geniculata (Hag.). 
Fig. 20. 
Fig. 20. Base and lower part of a zoarium, x 7 dia. 
Maastrichter Kreide : Maastricht. V an Breda CoU. D. 3380. 
LIST OF SPECIMENS. 
D. 3379. Three branches (on slide). Maastrichter Kreide. Maastricht. 
Van Breda Coll. One specimen figm'ed as Fig. 19. 
D. 3380. One specimen with base (on slide). Maastrichter Kreide. Maastricht. 
Figured as Fig. 20. 
D. 3378. Eight branches. Maastrichter Kreide. Maastricht. Van Breda 
Coll. 
d). 3523. Three branches. Maastrichter Kreide. Maastricht. Van Breda 
Coll. 
D. 6431. Six branches (on slide). Maastrichter Kreide. Bemelen. Busk 
Coll. 
D. 1375. A branch (on slide). Maastrichter Kreide. Maastricht. Vine Coll. 
