92 
BERENICE A. 
The fact that d’Orbigny named this species regularis, and that he 
included within it the forms he had originally named D. densata 
and D. orhicula^ suggests a comparison with B. papillosa (Eeuss), 
as that species is regular, densely crowded, and orbicular. But the 
names in this case are not descriptive, for B. regular is has its 
zooecia less crowded and less regularly arranged, and the zoarium 
is flahelliform rather than circular. 
Pocta’s figure of his Diastopora concreta agrees with the 
characters of the central part of a zoarium of this ‘ species ’ ; but 
the dimensions he gives are much greater. 
The nearest Jurassic ally of this ‘ species ’ is Berenicea allaudi 
(Sauv.), in which the zooecia are somewhat shorter and broader, 
somewhat fusiform in shape, and more uniformly distributed. 
The specimens of this ‘ species ’ may be conveniently divided 
into three varieties, amhita, gamhlei, and elliptiea^ in addition to 
the typical form. 
LIST OF SrECIMEIIS. 
British. 
D. 2642. Indeterminable zoarium, labelled B. regularis by Tine (on elide). 
Middle Chalk. Chatham. Vine Coll. 
D. 4104. A young zoarium encrusting an Inoceramus fragment. Middle 
Chalk. Chatham. Gamble Coll. 
D. 4163. A young zoarium encrusting an Inoceramus fragment. Middle 
Chalk. Chatham. Gamble Coll. 
D. 2038. A zoarium on Terebratula biplicata. Bed Chalk. Hunstanton, 
Jesson Coll. (No. 28a). "With an indeterminable specimen named 
Proboscina toucasiana (Orb.) by Vine. The specimen is recorded 
as Piastopora regularis by Vine : Quart. Journ. Geol. Soc. 
vol. xlvi. p. 476. 
Foreign. 
D. 4593. A young, typical zoarium, encrusting an Escharine fragment (on 
slide). Turonian: Craie marneuse. ViUardin, Loir-et-Cher. 
Figd. PI. VII. Fig. 8. 
6a. Berenicea regularis (Orb.), var. ambita,^ nov. 
Synonymy. 
Eeptotubigera ramosa (non d’Orb.), var. disciformis, Vine, 1893. Eep. Cret. 
Polyz. : Bep. Brit. Assoc. 1892, p. 308. 
^ From ambiOy ‘ to border,’ from the smooth selvage round the zoarium. 
