78 
OSCULIPORIDiE. 
Dimensions- 
Lonsdale’s 
type. 
pi. xviiiB, 
fig. 3. 
D. 2940 . 
: Mid. Chalk : 
Chatham, 
j B.M. 
D. 407. 
PI. III. 
Fig. 7. 
Upper Chalk: 
Beachv Head. 
B.'M. 
D. 7105. 
Zoarium : 
length of branch 
mm. 
40 
mm. 
mm. 
diameter of branch 
up to 2 
' M 
' 2 
length of sub -branch ... 
2-15 
1-7 
— 
diameter of sub-branch 
up to 1*2 
'7 
— 
distance of siib -branches 
2 up to 20 
— 
; — 
Zocecia : 
diameter of aperture ... 
without a 
sub -branch 
•08--1 
1 
' -06--08 
•1 
Gonoecia 
distance of centres of 
adjacent apertures ... 
up to *2 
•1--15 
1 X 1-3 
•2 
Distribution. 
British : 
Upper Chalk — Zone of Micraster coranguiunm : Bromley, Kent ; Charlton, 
Kent ; Gravesend. 
Middle Chalk — Zone of 31. cortestudinarmm : Chatham. 
Lower Chalk — Zone of M. hreviporus : Dover. 
Chalk : Sussex ; Beachy Head ; Charing, Kent ; Dover ; Maidstone ; 
Offham’s Pit, Lewes ; St. Catherine’s Hill, Guildford; Stocker’s Head, 
near Charing, Kent. 
Foreign : ^ 
Senonian — Maastrichtian : Sainte-Colomhe, Manche. 
Campanian: Eiigen ; Meudon, near Paris. 
Coniaciau : Lisle, Loir - et - Cher ; Tours ; Fecamp, Seine- 
Inferieure; Phelippeaux, Chareute-Inferieure. 
Turonian — Angoumian : Lavardin, Loir-et-Cher ; La Colliniere (zone of 
Micraster hreviporus). 
Figures. 
PI. III. Fig. 7. Part of a branch, showing the whole of 
a pinnule and a goncecium ; X 10 dia. Chalk — zone of Micraster 
cortestudinarium : Chatham. Gamble Coll. D. 407. 
^ D’Orbigny gives a list of French localities, but there is nothing to indicate 
which of them yielded the typical ramulosus and which the pinnate form 
H. gamblei. 
