100 
BEEEXICEA. 
8. Berenicea polystoma (Homer), 1839. 
Synonymy. 
Cellepora polystoma, Romer, 1839. Verst, nordd. Ool. Geb., App. p. 14, 
pi. xvii. fig. 6. 
Mosacilla ,, Rdmer, 1840. Verst, nordd. Kr. Geb. p. 19. 
Diastopora ,, d’Orbigny, 1850. Prod. Pal. vol. ii. p. 86. 
,, ,, von Hagenow, 1850; In Geinitz, Quadersandst. p. 234. 
,, ,, Pergeus, 1890. Revision, p. 333. 
Berenicea ,, d’Orbiguy, 1854. Bry. Cret. p. 863. 
Diastopora gracilis {non Edw.), Michelin, 1840. Icon. Zoopb. p. 5, pi. i. fig. 9. 
,, ,, {non Edw.), d’Orbigny, 1851. Bry. Crct. pi. 635, figs. 6-9. 
? Diastopora eretacea, Vine, 1885. Fourth Rep. Polyz. : Rep. Brit. Assoc. 1884, 
p. 167. 
,, congesta {non Orb.), Vine, 1893. Rep. Cret. Polyz.: Rep. Brit. 
Assoc. 1892, p. 329. 
Diagnosis. 
Zoarium circular, small, thick ; depressed in the centre. 
Zooecia cylindrical, rather thin ; not sinuous, but may curve 
upward at the distal end. Walls plain. The central zooecia 
are visible throughout; hut on the margins they are very 
crowded. 
Peristomes well raised ; irregularly arranged ; crowded. 
Dimensions. 
D’Orbigny’ s specimen 
Distance of apertures iu Pergens). B.M.,D.2987. B.M.,D.960. 
same longitudinal series ... ‘3-’5 mm. ... *2-‘4 mm. ... •3-'5 mm. 
Diameter of zooecia *15 ,, ... •15-*2 ,, ... *12-’15 ,, 
Diameter of apertures ’08 ,, ... •07-‘l ,, ... '08 ,, 
Disteibution. 
England : 
Middle Chalk: Chatham. 
Foreign : 
Rhodanian : Vassy, Bettancourt-la-Ferree and Baudrecourt, Haute- 
Marne ; Fontenoy and Auxerre, Tonne. 
Necomanian : Schoppenstedt, Hannover, in Hilsconglomerat ; Sainte 
Croix, A^aud ; Grandpre, Ardennes. 
PlGTJEES. 
PI. Y. Fig. 5. Middle Chalk: Chatham, k. zoarium, X 10 dia. 
Vine Coll. D. 2987. 
