HEXEKOPOKA. 
197 
Surface pustular, 'vrith. irregular, indefinite tubercles or knobs. 
Mesopores large ; in single lines between the apertures, but not 
well marked off from the zooecia. 
Dimexsions. 
Height of zoarium 
Diameter of zoarium ... 
Thickness of wall at upper eud 
Diameter of apertures ... 
Diameter of mesopores 
Distribution. 
Upper Greensand : 'Warminster. 
mm. 
60 
26 
about 10 
•12--15 
•06--08 
Figures. 
PI. VIII. Fig. 4. Fig. Aa, zoarium frciii the side; nat. size. 
Fig. 4J, from above ; nat. size. Fig. 4^;, part of the surface ; 
X 10 dia. D. 3177. 
Affinities. 
This species is nearly allied to H. nodosa (d’Orb.), from which it 
differs by the regular arrangement of the tubercular elevations 
in that species ; and also by the somewhat different arrangement 
of the apertures, which appear in H. nodosa to be collected into 
groups. 
D. 3177. The type -specimen. Upper Greensand. Warminster, Wiltshire. 
J. Brown Coll. Figd. PI. VIII. Fig. 4. 
6. Heteropora korycanensis, Slovak, 1877. 
Stnonymy. 
Heteropora korycanemia^ Novak, 1877. Bry. bohm. Kr. : Denk. Ak. Wiss. Wien, 
vol. xxxvii. pt. ii. p. 114, pi. ix. figs. 6-9. 
Diagnosis. 
Zoarium dendroid ; of thick, irregular, cylindrical branches, 
with tubercular surface. The branches are mostly in one 
plane, and are usually elliptical in section. 
Apertures small, round, or subangular ; widely and irregularly 
spaced. 
Mesopores very numerous ; often in biserial circles around the 
apertures. 
Dimensions. 
Zoarium of branches, 3-10 mm. thick, 10-25 mm. long. 
