412 
CLAUSA. 
D. 4662. A fragment of var. micropora (on slide). Turonian : Craie marneuse. 
Villardin Station, Loir-et-Cher. Purchased 1898. 
D. 4664. A branched fragment of var. micropora (on slide). Turonian: Craie 
marneuse. Villardin, Loir-et-Cher. Purchased 1898. 
D. 3767. A fragment of var. obllqtia (on slide). Coniacian or Turonian : 
Souge, Loir-et-Cher. Gamble Coll. 
2. Clausa francqana, d’Orbigny, 1853. 
Synonymy. 
Clausa francqana, d’Orbigny, 1853. Bry. Cret. pi. 766, figs. 13-15. 
,, ,, d’Orbigny, 1854. Ih'xd. p. 898. 
,, ,, Pergens, 1890. Revision, p. 375. 
Seteropora ,, Vine, 1893. Compl. Rep.: Rep. Brit. Assoc. 1892, p. 311. 
,, ,, Bucaille, 1890. Bry. Cret. Seine-Inf.: Bull. Soc. Sci. uat. 
Rouen, vol. xxv. p. 512. 
Diagnosis. 
Zoarium of thin, cylindrical branches, which divide dichoto- 
moiisly. The branches end in long, thin prolongations, which 
are much narrower than the branches and have no apertures. 
The zoarium is ornamented by radial ribs. 
Peristomes of medium height. 
Apertures usually distant in an ojien spiral ; but in older parts 
of the zoarium they are crowded and arranged in a compact 
spiral. 
Dimensions. 
Diameter of branch 
Diameter of zooecia 
Diameter of apertures 
D. 433. 
1 mm. 
•25-35 „ 
•08--1 „ 
Distribution. 
England : 
Upper Chalk : Bromley ; Gravesend. 
Middle Chalk : Chatham. 
Foreign : 
Senonian?: North of France. 
Turonian : Strehlen, Saxony, in Upper Planer. 
PiGURES. 
PI. XIII. Pig. 8. Part of a branch with bare proximal end ; 
X 10 dia. Upper Chalk : Kent. Simmons Coll. 40,363. 
