142 
DISCOSPAESA. 
Discosparsa simplex (d’Orbigny), 1851. 
Stnontmt. 
Liastopora simplex, d’Orbigny, 1851. Bry. Tret. pi. 641, figs. 5-8. 
Discosparsa ,, d’Orbigny, 1854. Bry. Cret. p. 823. 
„ ,, Pergens, 1890. Revision, p. 337. 
Lichenopora tubercnlata, d’Orbigny, 1851. Bry. Cret. pi. 646, figs. 1-4. 
Discosparsa ,, d’Orbigny, 1854. Ibid. p. 824. 
,, ,, Staring, 1860. Bod. Xederl. vol. ii. p. 402. 
Diastopora „ Hamm, 1881. Bry. mastr. Ob. -Sen. p. 25. 
Diagnosis. 
Zoarium small, fairly thick, with short conical ha-^^e. Upper 
surface tumid, with central depression. Hever.se surface 
covered by a basal, concentrically marked layer. 
Zooecia large and short. Peristomes arranged subquincuncially. 
Dimensions. 
Diameter of zoarium 
Height of zoarium 
Diameter of zooecia 
Diameter of aperture 
B.M., D. 4256. 
2 ’6 ram. 
Fig. 9i. 
Disteibijtion. 
British : 
Middle Chalk: Chatham. 
Foreign : 
Senonian — Maastrichtian : Fecamp, Seine-Inferieure ; St. Germain, 
near Paris ; Ciply ; and Mons. 
Coniacian ; Tours and Luynes, Indre-et-Loire. 
