90 
OSCULTPORID^. 
Diagnosis. 
Zoarium with long dichotomous branches, bordered by numerous 
short, sharply truncate pinnules, which give the branches 
a serrate aspect. The lower pinnules are opposite and are 
nearly at right angles to the branches ; their length is about 
the same as the width of the branch ; they are sometimes 
forked. The distal pinnules are alternate, and are shorter, 
pointed, and sub-triangular. 
The reverse surface is well rounded and covered by crowded 
pores. The obverse surface rises into a sinuous ridge, which 
gives off the short, blunt lateral processes. 
Dimensions. 
B.M. D. 7281. 
Figd. PI. III. 
Fig. 8. 
60,472. 
Height of zoarium ... 
29 mm. ... 
50 mm, 
Maximum width of the frond 
20 „ ... 
69 ,, 
Diameter of stem near base 
2-5 „ ... 
3-5 „ 
Length of lateral processes 
•> 
^ 9 9 • • • 
1-2 ,, 
Diameter of lateral processes 
•5-1 „ ... 
•5-1-5 ,, 
Average distance of middle of lateral processes 
1-3-1-6 ,, 
1-5-2 „ 
Diameter of zooecia ... 
-r , , ... 
— 
Diameter of apertures 
•1 M ... 
— 
Figures. 
PI. III. Fig. 8. A zoarium. Upper Chalk: Gravesend. Fig. 8a, 
the whole zoarium; nat. size. Fig. 8J, obverse face of one branch; 
X 6 dia. Fig. Sc, the reverse face of a branch ; x 6 dia. Harford 
Coll. D. 7281. 
Distribution. 
British : 
Upper Chalk — Zone of 3Iicraster coranguinum : Gravesend. 
Middle Chalk — Zone of M. cortestudinarium : Chatham. 
Foreign : 
Senonian — Campanian: Seine- Inf erieure (Bucaille). 
Coniacian: Vendomeand Villedieu, Loir-et-Cher; Ste. Christophe, 
Tonrs, and YaUieres-le-Grand, Indre-et- Loire; Phelippeaux, 
C harente- Inf erieure . 
Turonian — Angoumian : Lavardin, Loir-et-Cher. 
? Cenomanian : St. Calais {Jide Canu). 
Afeinities. 
This species is allied to gamllei, Greg., but differs by the 
hi- serrate form of its branches. The branches bear short, crowded. 
