622 
APPENDIX A. (LONSDALE ON CORALS.) 
2. The lamellae of the outer area sprang very generally from the boundary wall, the narrow being almost 
rudimentary, but the broad ranging with slight flexures across the zone, and sometimes into the central 
structure. Though conjointly exceedingly thin, the two plates could readily be detected in polished, 
transverse sections ; and in longitudinal fractures (fig. 2, 2 a mag.), the separated feathered surfaces were 
as clearly displayed in these comparatively minute columns as in the gigantic G'auinia of Ireland. There 
was, however, this difference ; in Stylastrrea the inner surface of the plates extended to the wall of the co- 
lumn, while in Caninia it was confined to a limited intermediate zone. The surface was traversed by 
strong, waved lines, inclined upwards and outwards. The interstitial plates, prolongations, in part at least, 
of the central laminas, were, as exposed in vertical sections, highly inclined, vesicular and numerous, but 
not so close or small as in Lhwyd s coral ; and in transverse sections they exhibited variously combined, 
curved or arched lines, also less numerous or closely disposed than in that fossil, on account apparently 
of the rudimentary character of the alternate or narrow lamellae. 
The exterior of the columns (fig. 2) was very irregular in outline, conforming, as before stated, to all in- 
equalities of upward development ; and not unfrequently one column overlapped, in part, an adjacent facet. 
The sides were crossed by fine, waved lines and prominent ridges, indicative of renewed or disturbed 
growth ; and they were traversed vertically by broad ribs of variable strength and persistence. 
With respect to the mode of producing additional columns, the remarks already given (p. 620 and 
fig. 2 b) contain all the information acquired from the examination of this specimen, except that stages of 
gradual completion of internal structure in the divided columns were noticed (fig. 2 c), and that the re- 
productive developments took place very irregularly, and in general at considerable intervals. No signs 
of a triple or quadruple partition were detected. 
Locality and Formation. — Kossatchi-Datchi, south of Miask, eastern side of the Ural Chain. Carboni- 
ferous limestone. ( Stylastreea inconferta thus affords an additional interesting link between the carboni- 
ferous fauna of Western Europe and that of the borders of Asia.) 
DiPIIY PH YLLXJM. 
This generic designation is proposed for certain corals which exhibit an aggregate of characters be- 
lieved to be sufficiently peculiar to warrant the fossils possessing them being considered the type of a new 
genus. The peculiarities were first observed in a specimen from the carboniferous limestone of the 
neighbourhood of Kamensk, on the Siberian side of the Ural Mountains, and more recently in a fossil of 
not rare occurrence in the equivalent formation near Bristol. The genera with which these corals are 
most nearly allied, as respects either structural details or mode of reproduction, are Lithodendron, Cya- 
thophyllum, Stylastrsea and Caryophyllia of Ehrenberg. In the following notice, allusion is constantly 
made to the English specimens also, as they exhibited prominently, in some instances, characters which 
were but slightly indicated in those from Kamensk ; and the reader is requested while perusing it to con- 
sult the figures of the latter fossil given in Plate A. (figs. 4 to 4 c). 
The points of resemblance between the corals under consideration and well-known species of Litho- 
dendron, are, in some states, so considerable, that the Bristol fossil may have been occasionally referred to 
one of them. In the mode of growth, both Lithodendron and the proposed genus agree by having deve- 
loped ramified masses, with the stems more or less distant from each other, but occasionally united when 
the interval was small. Internally both genera exhibit, in the zone surrounding the central area, a great 
uniformity of structure, allowance being made for specific diversities, and the variations which occur in 
different portions of the same specimen. The lamellae in both are also bi-plated. As regards the central 
area, it was composed in the Kamensk specimens of convex or flat diaphragms ; but in neither longitu- 
dinal or transverse sections obtained by fracture, and subsequently polished, were any signs detected of 
