24 PERMIAN FOSSILS. 
The original description, which appeared in the ‘ Beitriige,’ of Petraia being so 
imperfect,—Count Minster having drawn it up under the belief that he was describing 
a genus of Gasteropodous shells,—I have been compelled to adopt the diagnosis given 
by the author of the ‘ Palzeozoic Fossils of Cornwall, &c.’' The views, too, of Professor 
Phillips on the analogies of this genus may very appropriately follow as a pendant. 
“In the single unattached mass and denticulated lamellae of unequal lengths, we see 
the closest analogy with Fungia and Turbinolia (with the latter of which they have 
been commonly united) ; while the deeply concave, lamelliferous disc and the absence 
of horizontal septa seem to give generic peculiarity. The lamelle are not granular 
on their sides.” 
The genus is not known to occur in a recent state: all the species that have been 
described belong to the Palaeozoic formations, unless we include in it the Anthophyllum 
venustum of Minster found in the (?) Triassic beds of St. Kassian. 
PETRAIA PROFUNDA, Germar. Plate ILI, fig. 2. 
(?) Astr#A PEDICULATA, D. Phillips, Encye. Met. vol. vi, p. 615, 1834. 
(?) A Lameuirerous Coral, Phillips. Lardner’s Cycl. Geology, vol. i, p. 190, 1837. 
CYATHOPHYLLUM PROFUNDUM, Germar. Versteinerungen, p. 37, 1840. 
— — PA Geinitz, N. Jahrbuch, 1842, p. 579, pl. x 
fig. 14a. 
— — a Geinitz, Geea, von Sachsen, p. 98, 1843. 
= — 55 De Verneuil, Bull. Soc. Geol. France, 2™ série, 
vol. i, p. 23, 1844. 
PreTrata N.S., King. De Verneuil, Op. cit. 
— — » Geol. Russ. vol. i, p. 221, 1845. 
CYATHOPHYLLUM PROFUNDUM, Germar. Op. cit. 
PETRAIA DENTALIS, King. Catalogue, p. 5, 1848. 
CARYOPHYLLIA QUADRIFIDA, Howse. 'T. N. F. C. vol. i, p. 260, 1848. 
CYATHOPHYLLUM PROFUNDUM, Germar. Geinitz, Versteinerungen, p. 17, pl. vii, fig. 7, 1848. 
Diagnosis.—* Form conical, and slightly curved. Cavity deep, and longitudinally 
furrowed. Plates of two lengths ; the longest five or more in number, plain edged (? ) 
and reaching half way to the centre; the shortest from one to four in number. 
Lamellar interspaces with two very finely-denticulated, slightly prominent ridges.” 
The following description of Petraca profunda is copied from Geinitz : 
“ Umgekehrt lang-kegelformig mit tief herabgehender konischer Mindung. Die 
starken Liangslinien der Oberflache, deren man auf einer Halfte oben gegen fiinfzehn 
zihlt, werden unregelmassig und hausig durch concentrische erhdete und vertiefte 
Wachsthumsringe und Linien unterbrochen. Das untere Ende des Ganzen ist 
gewohnlich etwas seitwirts gebogen. Die Miindung geht bis zur Mitte der Hohe, 
1 Paleozoic Fossils of Cornwall, &e., p. 1. 
2 King, Catalogue, p. 5, 1848. 
