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APPENDIX A. (LONSDALE ON CORALS.) 
the name of Calamopora ( Favosites ) spongites by Goldfuss (Petref. pi. 28. fig. 1), were referred to Favo - 
sites ( Calamopora ) polymorpha, though some of them were included by that authority in the species 
spongites. I he alteration, nevertheless, appeared to he justified by M. Goldfuss’s own remark, that 
the corals are perhaps only varieties. 
The fossil from Katchukof, assigned in this instance to Fav. polymorpha, and probably the one from 
the Ural Chain east of Alatau, agreed closely with the Silurian specimen figured in pi. 15. of Mr. Mur- 
chison s work ; but the coral from the lake of Petropavlofsk resembled, in the greater thickness of its 
walls, more nearly the Devonshire (Devonian) variety. 
Localities and Formations. — Katchukof, on the Upper Belaia and Uziansk Zavod, in the South Ural 
Chain ; Silurian. East of Alatau, South Ural ; Devonian 1 ? Banks of the lake of Petropavlofsk sixty 
versts north-west from the Works of Bogoslofsk, North Ural ; Upper Silurian ? 
Michelinia concinna, sp. n. 
Columns in egularly polygonal, more or less rounded internally ; central plates numerous, transverse, broad, 
slightly convex or concave ; walls variously constructed, perforated ; terminal cells lined with vesicular 
plates. (PI. A. fig. 3.) 
Of this coral, two specimens, both from a locality five versts east of Ust-Koiva, were examined. One of 
them, a thin layer, about two inches in width and one and a quarter in breadth, exhibited transverse sec- 
tions of the interior of the columns ; and the central plates, when viewed on the upper surface, resembled 
those of Michelinia tenuisepta, as delineated by M. de Koninck in his work on the ‘ Palaeozoic Fossils of 
Belgium 2 ,’ pi. C. fig. 3 b. ; but in the vertical section the Russian coral differed essentially from that 
species, according to the structure represented by M. Michelin in pi. 1 6, fig. 3 b. of his ‘ Iconographie 
Zoopliy tologique V the transverse plates having a great uniformity of position, with, in general, a slightly 
convex or concave outline, and not a total want of regularity of situation and curvature. A similar 
distinction was observed between the Russian fossil and a specimen from the Mendip Hills (England), of 
the coral to which the name of Michel, lenuisepta is now applied. This fossil was originally noticed and 
figured by Parkinson (Org. Rem. vol. ii. pp. 39, 40. pi. 5. fig. 9) ; and was first introduced into a sy- 
stematic arrangement of Polyparia, it is believed, by Dr. Fleming, under the name of Porites cellulosa 
(British Animals, p. 511 (1828), where Parkinson’s figure is quoted) ; but it was subsequently assigned 
by Mr. Phillips, though with a doubt, to Calamopora, and distinguished by the specific name of tenui- 
septa (lllust. Geol. Yorkshire, partii. (1836), pi. 2. fig. 30. pp. 201 and 246, for the generic doubt; Mr. 
Phillips refers to Parkinson’s figure and locality) ; and, lastly, M. de Koninck gives Mr. Phillips’s Cala- 
mopora tenuisepta as a synonym in describing Michelinia tenuisepta. 
An examination of the Mendip Hill specimen also, not only proved Mr. Phillips to be correct in stating 
that “ the walls are perforated towards the margins” ( opus cit. p. 201), but that the perforations, irre- 
gular in form, size and position, extended throughout the whole length of the tubes, wherever the inner 
surface of the walls was laid open or stript of a lining of highly inclined plates. It is therefore probable 
that M. de Koninck’s specimens, as in the one figured in plate C. of his work, were so provided with 
a layer of lateral plates, that the perforations were concealed (see Descript. Anim. Foss. p. 32). 
The finest specimen of Michelinia concinna might be considered as the fourth of an elliptical mass (PI, A. 
fig. 3), and the dimensions on the lines of the major and minor axis, were respectively, two inches and one 
1 Bord de 1’ etang de Petropawlofsk 60 versts de la fabrique de Bohoslow sur le N.E. 
* Description des Anim. Foss, dans le Terr. Houllier et dans le Syst. Super, du Terr. Anthraxifere de la Bel- 
gique. 4 to, 1842. 
s Icon. Zooph. des Polypiers Fossiles de France et Pays Environnants. 4to, 1842. 
