626 
APPENDIX A. (LONSDALE ON CORALS.) 
of that coral belonging to Mr. Austen are briefly shown to undergo a very remarkable change at a certain 
period of development, and inferred to be that which limited its growth. Whether the specific determi- 
nation was correct, remains to be proved by the discovery of Silurian specimens, exhibiting fully the same 
state. The author of these notes is not aware of any observations having been made upon this important 
inquiry ; and he is unwilling to propose, on imperfect evidence, specific separations ; but a Gothland 
specimen in Mr. Murchison’s cabinet afforded a few instances of the obliteration of tubes by the extension 
and union of the lamella: . The characters, thus presented, differed however materially from those ex- 
hibited by the specimens from the Devonian limestones of England, being merely a junction of lamellm 
without any of the fillings-up by transverse or convex laminae so prominent in the other instances. It 
has, however, been deemed right to call attention to the subject, and it is hoped that it will receive from 
those possessed of the requisite facilities, a full share of consideration. 
In the recent Heliopora crerulea of De Blainville ( Pocillopora ceerulea, Lamarck), a somewhat similar 
obliteration of the tubes occurs, but the agreement is not considered sufficient in the present state of the 
inquiry to justify the restoration of Porites pyriformis to that genus, other Anthozoa exhibiting also re- 
markable changes in the external characters at a certain, possibly final period of development. 
Localities and Formations. — Isle of Dago ; Petropavlofsk ; Gothland ; Malmoe Isle, in Christiania Bay ; 
Upper Silurian. 
Aulopora conglomerata ?, Goldf. 1 
Petrefacta, p. 83. pi. 29. fig. 4. 
The fossil assigned with a doubt to this coral, was attached to a mass of Favosites, and occupied a 
surface about an inch in diameter. It consisted of an aggregate of nearly horizontal or inclined tubes, 
forming what might be considered as the base, or commencement of a group similar to that figured by 
M. Goldfuss (loc. cit. supra'). 
Locality and Formation. — Isle of Dago. Upper Silurian. 
Stromatopora concentrica, Goldfuss. 
Petrefacta Musei Univer. Bonnensis, p. 22. tab. 8. fig. 5. 1826. 
Mr. Murchison’s Silurian System, part ii. p. 680. pi. 15. fig. 31. 1839. 
No differences were observed between the Russian specimens of this coral, and those found in the 
Silurian formations of England. In Russia it occurs also in considerable masses, equalling many of the 
larger specimens obtained in the Wenlock limestone, one, from the Isle of Dago, measuring eight and a 
half inches in length, five in its greatest breadth, and three and a half in thickness ; and another of an 
oval form from Petropavlofsk on the east flank of the Ural Chain, being about nine inches in one diameter, 
and five in the other. 
It does not appear to be a common fossil in Gothland, not being mentioned by Fougt in his memoir on 
the Corals of the Baltic, or by Hisinger in the Lethsea Suecica ; the author of these notes has also seen 
but one small fragment imbedded in a slab of encrinital limestone. It is believed to occur in one of the 
Silurian deposits of the bay of Christiania. 
Localities and Formations. — Naissi in Lithuania ; Gothland ; Isle of Dago ; North of Petrozavodsk ; 
Petropavlofsk, and between N. and V. Turinsk, east flank of North Ural ; Isles of Christiania Bay. 
Silurian. 
Fenestella, Miller. 
This genus was originally proposed by the late author of the work on Crinoidea, but it was first intro- 
duced into a published notice on fossil corals, in the Appendix to Mr. Murchison’s ‘ Silurian System ’ 
1 A second species of Aulopora ( A . serpens ?) was found by Count Keyserling in the Devonian strata of Voroneje, 
but has not been submitted to Mr. Lonsdale. 
