APPENDIX A. 
(LONSDALE ON CORALS.) 
633 
polished section ; 3 a, the side section magnified to show the arrangement of the transverse plates 
and the existence of foramina, (p. 611.) 
Fig. 4. Diphyphyllum concinmm. — 4, general characters of an undivided stem, natural size; 4a, exterior 
of a divided stem, natural size ; 4 b, interior of a divided stem to show the perfect bi-partition of the 
central structure and the uninterrupted continuation of the outer vesicular band or zone, natural 
size ; 4 c, magnified portion of the interior to exhibit the analogy with the centre of Cyathophyllum. 
(p. 624.) 
Fig. 5. Lithodendron unnulatum. — 5, group of stems to show the mode of occasional union, natural size; 
5 a, vertical section to explain the nature of the central plates, (p. 599.) 
Fig. 6. Caninia Ibicina. — 6, illustrates the characters of the lower portion of a stem, natural size ; to the 
left of the upper part the outer or vesicular zone is in contact with fragments of the lamelliferous 
zone ; a little lower the vesicular zone is greatly diminished, and near the bottom the figure shows 
correctly that the structure of the coral was there limited to the lamelliferous zone, and the central 
area composed of transverse diaphragms ; the siphon-folds were not noticed in this specimen ; 6 a, 
6 b, fragment of also a lower or bi-areal portion, but with the siphon folds preserved, natural size, 
and magnified; 6c, a baseal termination, consisting of lamelhe in nearly close contact, with faint 
indications of a central structure, natural size ; 6 d, portion of upper part of 6 c magnified to exhibit 
the siphon and concentric laminae, (p. 617.) 
Fig. 7. Tryplasma tequabilis. — 7, gives, under various conditions, the vertical rows of foramina which 
perforated the lamellae, natural size ; 7 a, an oblique transverse section, showing near the outer walls 
foramina in the substance of the lamellae, and towards the centre rows of detached circles, indicating, 
it is believed, that the foramina terminated on the edge of the lamellae in tubuli, natural size. 
Fig. 8. Tryplasma articulata. — This coral, believed to be the Cyathophyllum articulatum of M. Hisinger, 
a Gothland fossil (Lethaea Suecica, pi. 29. fig. 4), is given to prove, that the peculiar characters ex- 
hibited by Tryplasma tequabilis occur in another coral with a sufficient amount of differential structure 
to warrant the establishing of a second species, and therefore the proposing of the sub-genus. 
Fig. 8 illustrates the general structure shown by a vertical section of the natural size, and 8 a gives 
a magnified view of the foramina ; 8 b, 8 c, exhibit, in the natural size and magnified, superior termi- 
nations of the columns, with tubular projections along the edges of the lamellae. 
Fig. 9. Chcetetes radians. — In fig. 9 the parallel, curved lines mark the position and range of the bands 
of diaphragms ; 9 a, is given to illustrate the production of additional columns by vertical plates 
developed within the area of pre-existing columns ; the figure exhibits accurately the characters of 
the plates in transverse and perpendicular sections ; it shows also the nature of the diaphragms. 
Fig. 10. Chatetes Petropolitanus. — Fig. 10 gives the general but irregular distribution of the diaphragms 
over the whole surface, and not limited to bands as in Chatetes radians, magnified; 10a, portion of 
a large globular specimen in which the diaphragms occurred throughout the vertical section in the 
manner exhibited, natural size. 
Fig. 1 1 . Stenopora spinigera. — Magnified figure, with mouths more or less closed. 
Fig. 12. Stenopora crassa. — 12, general characters of the coral; 12a, contracted tubes magnified. 
Fig. 13. Strombodes. — A transverse section for comparison with the English carboniferous species. 
The Plate was lithographed by Mr. J. de Carle Sowerby with his habitual attention to truthfulness of 
character. 
