_&. B. VINE ON CRETACEOUS LICHENOPORID®. 853 
R, pustulosa, d’Orb. ; but whether it is distinct from the Upper-Green- 
sand form * described by d’Orbigny, I cannot say. 
In longitudinal section of the layers ot Zt. pustulosa, and only in 
certain places favourable for observation, some of the zocecia are 
seen to be small horn-like tubes (fig. 1, B), wide at the top and 
thinning towards the proximal end. ‘The ends of these tubes are 
attached apparently to a laminar layer, but in no sense identical 
with that which is generally represented surrounding the zoarium of 
species of Discoporella. The use of the word “laminar” then must 
be regarded as a convenient term, rather than as a structurally 
correct one, whenever it may be applied in descriptions of Paleozoic 
or Mesozoic Polyzoa. 
In describing Lichenopora hispida, Mr. Hincks says (op. cit. p. 474), 
“The composite form seems to owe its origin to successive buddings 
from the margin, the cluster of distinct disks thus produced 
gradually coalescing so as to constitute a massive zoarlum with a 
mamillated surface.” 
It will be seen from the above remarks, and from the figures sup- 
plied, that the structure of the Lower Greensand F. pustulosa differs 
in many ways from that of Lichenopora hispida, Flem., 2. pustulosa, 
Waters, and the varicty of L. hispida (var. a meandrina, Peach) ; but 
the mode of zoarial aggregation seems to be the same in all the 
fossil and recent forms of the Lichenoporide. In the identification of 
species, however, it is necessary to state whether the forms described 
as Lichenopora are allied to the more ancient, or to the more recent 
forms. | 
The species which I am about to describe is unlike any recent 
Lichenopora known to me, and also unlike any described form found 
in either the Cainozoic or Mesozoic rocks ; I am obliged, therefore, 
to describe it as new. 
LICHENOPORA PAUCIPORA, D. Sp. 
Fig. 2.—Lichenopora paucipora, Vine, zoarium from above. 
Enlarged 20 diameters. 
Zoarium stipitate, with a disk-like capitulum slightly cupped ; 
stipitate column coarsely ribbed, arising from a contracted cellular 
base, having a diameter of about one sixteenth of an inch, height of 
* See Waters, op. cit. p. 278. . 
@s0.G.0., Nov 160; OL 
