212 
SULCOCAVA. 
Sulcocava lacnjma, d’Orbigny, 18-53-4. Bry. Cret. p. 1022, pi. 789, figs. 9-12. 
,, ,, Pergens, 1890. Revision, p. 368. 
,, stdcata, Vine, 1893. Compl. Rep. : Rep. Brit. Assoc. 1892, p. 310. 
Diagnosis. 
Zoarium of laterally compressed branches, which divide dichoto- 
mously. The obverse face is carinate. 
Zooecia a central unpaired series along the obverse face ; latendly 
there are alternate rows of from three to six apertures. The 
front walls of the zooecia arc depressed. The zooecia are 
separated by longitudinal furrows. 
Apertures elliptical, crowded, in regular alternate rows. 
Dimensions. 
Diameter of biMnch *3 x *5 mm. 
Diameter of zooecia ... ... ... ... *12 ,, 
Diameter of aperture •08--1 ,, 
Distiubution. 
England : 
Middle Chalk : Chatham. 
Foreign : 
Senonian — Maastrichtiau : Royan, Charente-Iuferieure. 
Coniacian: Veudome and Varenues, Loir-et-Cher ; Tours, 
Joue, Luynes, and La Ribochere, Indre-et- Loire. 
Fig. 21. Fig. 22. 
Sulcocava cristata, Orb. 
Figtjees. 
Fig. 21. Part of a branch, X 26 dia., from the side. Middle 
Chalk : Chatham. Yine Coll. D. 714. 
Pig. 22. Longitudinal section of another branch, showing 
tabulae; X 12 dia. Middle Chalk: Chatham. Gamble Coll. 
D. 3974. 
