10 
THEONOIDJE, 
PlGUEES. 
PL I. Pig. 3. A zoariura of var. gaudryana. Orb., attached to 
a plate of EchinocoryB scutatus, Leske ; x 10 dia. Upper Chalk: 
south-east of England. Morris Coll. D. 4582. 
Pig. 11, p. 9. Three confluent colonies ; X 3 dia. Maas- 
trichter Kalk : Maastricht. Yan Breda Coll. D. 3427. 
Affinities. 
This ‘species’ is most nearly allied to A. hrongniarti (Orb.), 
from which it differs by having long, narrow biserial, instead of 
short, triangular, triserial to multi serial rays. The species has 
three main varieties — var. nov. regularise with a broad selvage ; 
var. flabellata (d’Orb. as sp.), with an excentric radial centre ; 
var. gaudryana (d’Orb. as sp.), with lower and more numerous rays 
than in the typical form from Maastricht. 
The Lichenopora cretacea of Defrance is clearly an Actmopora, 
and from its dimensions (4-6 mm.), and from the distribution 
assigned to it (Meudon, Maastricht, and N’ehou), it is more 
probably Actinopora disticha than A. hrongniarti ^ which is very 
rare at Maastricht; but Defrance’s description is inadequate, and 
does not even mention whether the rays are biserial or uniserial. 
Hence his name cannot be adopted. The remaining species which 
Defrance included in Lichenopora are the Eocene L. turhinata, the 
type of the genus Lichenoporae and L. crispa, which is referred 
by d’Orbigny to Discocavea. • 
Por possible relations to MuUituhigera gregaria see p. 23. 
LIST OP SPECIMENS. 
British. 
D. 4582. A zoarium of var. gaudryana, attached to a plate of Echinocorys 
scutatus, Leske (on slide). Upper Chalk. Loc. ? Morris Coll. 
Figd. PI. I. Fig. 3, as showing especially well the arrangement 
of the central zooecia. 
B. 4583. A similar zoarium of var. gaudryana, attached to an echinid plate (on 
sHde). Upper Chalk. Loc.? Morris ColL 
50,465. Two zoaria of var. gaudryana, attached to fragments of Echinocorys 
scutatus, Leske. Upper Chalk. Loc. ? Morris Coll. 
50,458. Two zoaria of var. gaudryana, attached to echinid plates (on slide) . 
Upper Chalk. England. Loc. ? Morris Coll. 
D. 4266. A zoarium with highly raised radii, intermediate between the typical 
var. disticha and var. gaudryana. Middle Chalk — zone of Micr aster 
cortestudinarium. Chatham. Gamble Coll. 
