96 
BERENICE A. 
Distribution. 
Middle Chalk : Chatham. 
Affinities. 
This variety has the same dimensions as B. regularise var. gamhlei, 
which is its nearest ally ; the two varieties differ in zoarial form 
and thickness, and in the greater regularity in the distribution of 
the peristomes in var. elliptica. The zoarium resembles that of 
B, disciformise Hag., hut differs owing to the more crowded 
apertures and larger zooecia. 
Figures. 
PI. YII. Fig. 9. A discoid zoarium on an echinid fragment; 
X 10 dia. Middle Chalk: Chatham. Gamble Coll. D. 3896. 
LIST OF SPECIMENS. 
D. 3896. Var. elliptica, encrusting an echinid fragment (on slide). Middle 
Chalk. Chatham. Gamble Coll. Figd. PI. VII. Fig. 9. 
D. 3927. A zoarium of var. elliptica, encrusting a fragment of Echinocoryt 
(on sHde) . Middle Chalk. Chatham. Gamble Coll. 
D. 3901. A zoarium of var. elliptica, encrusting a fragment of Echinocoryt 
(on slide). Middle Chalk. Chatham. Gamble Coll. 
D. 3926. Three young zoaria of var. elliptica (on slide). Middle Chalk. 
Chatham. Gamble Coll. 
D. 3920. Two small zoaria of var. elliptica on echinid fragments (on sHde). 
Middle Chalk. Chatham. Gamble Coll. 
D. 3890. A large zoarium of var. elliptica, encrusting a fragment of Eehino- 
eorys (on slide). Middle Chalk. Chatham. Gamble Coll. 
6. Berenicea acanthina, nov. 
Synonymy. 
Zoarium irregular in form ; the young colony is flahelliform. 
Zooecia small; very irregularly arranged; crowded, with highly 
raised, well separated peristomes, which give the zoarium 
a rough, spiny aspect. 
• 
Dimensions. 
Diameter of zoarium ... 
• • • 
2x5 mm. 
Distance of peristomes 
.. 
•25--6 „ 
Diameter of zooecia ... 
... 
•1--15 „ 
Diameter of aperture ... 

•05--07 „ 
Distribution. 
Upper Chalk : Bromley. 
Middle Chalk : Chatham. 
