164 
CEISIXA. 
DrSTRIBUTEOX. 
England : 
Upper Chalk : Kent. 
Middle Chalk : Chatham. 
Upper Greensand : Cambridge. 
E OREIGN : 
Senonian — Maastrichtian : ^tendon ; Sainte - Colomhe, Manche ; 
Fecamp ; Chateaudun, Eure-et-Loire ; Royan. 
Santonian: Saintes ; L’Arche de Leves, Chartres. 
Coniacian : Villedieu, Villavard, Les Roches, and Vendume, 
Loir - et - Cher ; Sainte - Pateme and Tours, Indre - et - 
Loire. 
Tiironian; Moutier, Charente ; Les Roches, Loir-et-Cher. 
Cenomanian : Le Mans, Sarthe ; lie Madame, Charente-Inferieure, in 
Calcaire a Caprines ; Kank, Bohemia, in Korycaner 
Schichten. 
Figure. 
PL YIII. Fig. 7. Part of a zoanura of var. triangularis^ Tritli 
a gonoecium at the upper end ; seen from the side ; X 1 4 dia. 
Middle Chalk : Chatham. Vine Coll. D. 973. 
Affinities. 
This Piyozoan resembles Crisina {Retecava) geometrica (Hag.) by* 
the pores traversing the epitheca on the reverse side ; it differs 
from that ‘species,’ hoTrever, by the shape of the transverse 
section and absence of the reverse axis. Hence it is left in 
Crisina. 
The C. normaniana is kept distinct by Pergens, although according 
to his measurements it agrees identically vrith C. cenomana, except in 
the size of the aperture ; hut the normaniana appears to he a worn 
basal portion of a zoartum, so that neither the size of the existing 
aperture nor the median space is more than an individual character. 
LIST OF SPECIMEXS. 
British. 
D. 973. Two fragments of var. triangularis ; one has a lateral gonoecium. 
Middle Chalk. Chatham. Tine Coll. Figd. PI. VIII. Fig. 7. 
D. 444. Fragments (on slide) : var triangularis. Middle Chalk. Chatham. 
Gamble Coll. 
D. 3982. Thi’ee fragments (on slide) : var. triangularis. Middle Chalk. 
Chatham. Gamble CoU. 
D. 2697. A distal end of branch, with hiserial apeiiaires : var. triangularis. 
Middle Chalk. Chatham. Tine Coll. 
