ACTINOPORA. 
15 
D. 4199. Three zoaria on a test of Echinocorys scutatus, Leske, with eleven 
other Bryozoa. Middle Chalk — zone of Micrastcr cortestudi)iarium. 
Chatham. Gamble Coll. 
4. Actinopora convexa (Homer), 1840. 
Synonymy. 
Defrancia convexo, Rdmer, 1840. Verst, nordd. Kr. p. 20, pi. v. fig. 18. 
>» von Reuss, 1846. Verst, bdhm. Kr. p. 65, pi. xiv. figs. 32rt:,^. 
Unituhigera ,, d’Orbigny, 1853. Bry. Cret. p. 759. 
Eiscopora mamillata, Woodward, 1833. Geol. Norfolk, p. 46, pi. iv. fig. 2. 
Diagnosis. 
Zoaiium thick and conical, with convex, upper surface, and 
depressed centre. Apertures in uniserial ridges, which are 
very close to one another. Selvage wide. 
Dimensions. 
50,460. 
PI. I. Fig. 7. 
Diameter of zoarium ... ... 3*5 mm. 
Thickness of zoarium ... ... '8 ,, 
Number of rays ... ... ... about 17 
Distribution. 
English : 
Upper Chalk : Norwich. 
Middle Chalk — Zone of Micrasfer cortestudinarium : Chatham. 
Foreign : 
Senonian : Gehrdeu, Germany. 
Cenomanian — Lower Planer : Schillinge, near Bilin, Bohemia {fide von 
Reuss) . 
Figures. 
PI. I. Fig. 7. A zoarium; X 10 dia. Upper Chalk (attached 
to an EcMmcoryH scutatiis). Loc. ? (probably south - east of 
England). Morris Coll. 50,460. 
Affinities. 
This species is allied to A. complanata, from which it differs by 
its conical thick zoarium. Both the first two figures given of this 
species are poor. 
LIST OF SPECIMENS. 
50,460. A zoarium attached to plate of Echinocorys scutatus, Leske. Upper 
Chalk. Loc. ? Morris Coll. Figd, PI. I. Fig. 7. 
D. 4261. A zoarium on echinid fragment (on slide). Middle Chalk — Zone of 
Micraster cortestndinaHum. Chatham. Gamble Coll. 
