CLAUSA. 
415 
D. 4565. 
D. 4566. 
D. 4169. 
D. 699. 
D. 723. 
D. 4569. 
D. 4941. 
D. 4070. 
A branched zoariimi with well-preserved narrow distal end and rather 
high peristomes (on slide). Middle Chalk. Chatham. Vine Coll. 
A branch (on slide). Middle Chalk. Chatham. Vine Coll. 
A branch with Entahphora linearis, Orb. (on flint). Middle 
Chalk. Chatham. Gamble Coll. 
Three branches (on slide) . Middle Chalk. Chatham. Vine Coll. 
One branch (on shde) . Middle Chalk. Chatham. Vine Coll. 
Longitudinal section (on slide). Middle Chalk. Chatham. 
Gamble Coll. 
A fragment with basal part of stem (on slide). Middle Chalk. 
Chatham. Gamble Coll. 
Eight fragments (on slide), with Clausa carantina ; Nos. 1, 2, 4, 
and 5. Middle Chalk. Chatham. Gamble Coll. 
3. Clausa irregularis (d’Orbigny), 1850 {pars 1851 
and pars 1854). 
SY^^OXTM^. 
Eatalophora irregularis, d’Orbigny, 1850. 
,, ,, d’Orbmnv, 1851. 
Clausa 
non Sparsicavea 
non 
Prod. Pal. vol. ii. p. 267. 
Bry. Cret. pi. 624, figs. 9-12. 
d’Orbigny, 1851. Ibid. pi. 617, figs. 5-7. 
Bucaille, 1890. Bry. Cret. Seine-Inf. : Bull. Soc. Sci. 
nat. Rouen, vol. xxv. p. 511. 
d’Orbigny, 1853-4. Bry. Cret. p. 897, pi. 766, figs. 10-12. 
d’Orbigny, 1854. Ibid. p. 949. 
Marsson, 1887. Bry. Riig. : Pal. Abb. vol. iv. p. 26, 
Hetcropora 
y y 
non , , 
yy 
pi. ii. fig. 6. 
,, Pergens, 1890. Revision, p. 373. 
,, Pergens, 1893. Bry. St. Pat. : Bull. Soc. beige Geol. 
vol. vi., Pr. Vb. p. 208. 
,, Vine, 1893. Compl. Rep. : Rep. Brit. Assoc. 1892, 
p. 311. 
,, Canu, 1897. Bry. St. Cal. : Bull. Soc. geol. Fr. ser. 3, 
vol. xxv. p. 747. 
crassa von Hagenow, 1851. Bry. Maastr. Kr. p. 46, pi. v. 
figs. 12, 13. 
,, Marsson, 1887. Bry. Riig. : Pal. Abb. vol. iv. p. 26, 
pi. ii. fig. 5. 
,, Ubaghs, 1888. Compt. Rend. Exc. : Bull. Soc. beige 
Geol. vol. i., Mem. p. 233. 
Diagnosis. 
Zoarium of cylindrical, dichotomous branches, with distant, 
irregularly arranged apertures. Peristomes raised to medium 
height. The superficial ornamentation is faint. Dactylethim 
in a circle round the peristomial portion of the zooecia. 
