CLAUSA. 
409 
Entalophora mkropora, d’Orbigny, 1851. Bry. Cret. pi. 624, figs. 1-3. 
Clausa ,, d’Orbigny, 1853-4. Ibid. p. 896, pi. 766, fig. 9. 
Heteropora ,, Pergeus, 1890. Eevision, p. 373. 
„ ,, Pergens, 1893. Bry. St. Pat. : Bull. Soc. beige Geol. 
vol. vi., Pr. Yb. p. 208. 
Entalophora punctata, d’Orbigny, 1851. Bry. Cret. pi. 623, figs. 4-7. 
Laterocavea ,, pars, d’Orbigny, 1853-4. Ibid. p. 993; non pi. 772, 
figs. 15-17. * 
Entalophora obliqua, d’Orbigny, 1851. Bry. Cret. pi. 623, figs. 18-21. 
Clausa ,, d’Orbigny, 1854. Ibid. p. 895. 
Heteropora ,, Pergens, 1893. Op. cit. p. 208. 
,, „ Canu, 1897. Bry. St. Cal. ; Bull. Soc. geol. Fr. ser. 3, 
vol. XXV. p. 747. 
Heteropora [Clatcsa) obliqua, Pergens, 1890. Eevision, p. 373. 
Diagnosis. 
Zoarium of cylindrical or compressed branches, which divide 
dichotomously. The branches end bluntly, and are not 
prolonged into barren, narrow stems without apertures. 
Apertures crowded, usually arranged in close spirals, and 
quincuncial, or somewhat irregular in distribution (in forms 
micropora and reticulata). External surface of the zoarium 
smooth or punctate, or marked by faint radial ribs. 
Dimensions. 
Diameter of branch . . . 
Diameter of zooecia . . . 
Diameter of aperture 
Fide Pergens. 
compressa micropora B.M., D.2711. 
— ... — ... *9 mm. 
- ... - ... -2 „ 
•08 ... -08 ... •08--1 „ 
Distkibution. 
England : 
Middle Chalk : Chatham. 
Foreign : 
Senonian — Maastrichtian : Meudon ; Sainte-Colombe, Manche ; Eoyan. 
Campanian: Eiigen. 
Santonian : Saintes, etc., Charente-Inferieure. 
Coniacian : Vendome, Loir-et-Cher ; Tours, Joue, and 
Luynes, Indre-et- Loire. 
Coniacian or Turonian ; Yillavard, Lavardin, Les Eoches, Souge, etc. , 
Loir-et-Cher. 
Turonian : Sainte-Maure, Indre-et-Loire ; St. Germain d’ Arce, Sarthe ; 
Merpins, Charente ; Montoire, Villardin, St. Eimay. 
Cenomanian : Le Mans and Janieres, Sarthe ; Yillers, Calvados. 
