HETEEOPOEA. 
187 
Dimensions?. 
Goldfuss, 
pi. X. 
fig. 3a. 
T^-pe of 
cryptopora, 
fide, Hag. 
Goldfuss, 
pi. X. 
fig. 3c. 
tenera, 
Hag. 
crassa. 
Hag. 
Specimen 
from 
Derry, 
fide 
Portlock. 
B.M. 
D. 6366. 
mm. i 
mm. 
mm. 
mm. 
mm. 
Height of zoarium 
17 
11 
12-5-25 
15 
Diameter of stem 
3-4 
4-5 
4 
12-5 
4-7 
, , apertures 
; •04--05 
•05 
•16' 
•04? 
•1 
, , mesopores 
I -025 
j 
•025 
•05 
j dia. of 
the 
apertures 
•03--04 
No. of apertures 
per sq. mm. 
' about 35 
i 
1 
about 30 
about 1 0 ‘ 
about 25 
Disteibution. 
British : 
? Chloritic chalk : Tamlaght, co. Derry, Ireland [fide Portlock). 
? Cenomanian; Blackdown, Devon [fide Downes). 
Foreign : 
Senonian — Maastrichtian : Maastricht and Fauquemont ; Calcaire de Kun- 
raed [fide Uhaghs). 
Campanian: Riigen. Zoueoi Belemnitellamucronata'. Stafversvad, 
Hemmingslycke, and Mdrhy ; beds with Actinocamax mamil- 
latus, Ignaberga, Balsberg, V. Olinge, Ifo, and Barna- 
kallegrottan, Sweden. 
? Coniacian : Tours [fide Canu). 
? Albian : Les Croutes, Dep. de TAube [fide Leymerie). 
PHauterivian : Vassy [fide Cornuel). 
Figijees. 
Fig. 47, p. 186. A zoarium from the side ; X 2 dia. Maastrichter 
Kalk : Fauquemont. Busk Coll. D. 6366. 
Fig. 48, p. 186. Part of the surface of the same specimen; 
XlSi^dia. Maastrichter Kalk : Fauquemont. Busk Coll. B.6366. 
Fig. 49, p. 188. Part of a vertical section through the end 
of a branch of another specimen ; X 1 0 dia. Maastrichter Kalk : 
Fauquemont. Busk Coll. D. 6366b. 
’ These figures taken from von Hagenow’s figure may be too great; 
von Hagenow’s fig. 12d is said to be magnified only 15 diameters, but this may 
be an error. Otherwise the apertures are twice as large as in H. tenera. 
