THE ANNALS 
AND 
MAGAZINE OF NATURAL HISTORY. 
[SECOND SERIES.] 
OP Fewdbsvedeuncedbe per litora spargite muscum, 
Naiades, et circdm vitreos considite fontes : 
Pollice virgineo teneros hic carpite flores : 
Floribus et pictum, dive, replete canistrum. 
At vos, o Nymphe Craterides, ite sub undas ; 
Ite, recurvato variata corallia trunco 
Vellite muscosis e rupibus, et mihi conchas 
Ferte, Dez pelagi, et pingui conchylia succo.” 
N. Parthenii Giannettas#i Ecl. 1. 
No. 13. JANUARY 1849. 
1.—On some new genera and species of Paleozoic Corals and Fora- 
minifera. By Frepericx M‘Coy, M.G.S. & N.H.S.D. &e. 
ZOOANTHARIA. 
Petraia* gigas (M‘Coy). 
Sp. Char. Obtusely conical, slightly oblique, section elliptical ; 
internal cast divided into forty broad, flat, smooth ribs, sepa- 
rated by the strong sulci of the principal lamellz reaching to 
the centre ; each of those ribs is divided by a fine mesial sulcus, 
the remains of the mtermediate lamellz, not reaching to the 
centre, making the total number of lamelle about eighty. 
Length of imperfect cast 2 inches 7 lines ; width of long axis 
at base 11 lines, at edge of cup 3 inches 7 lines (compressed), 
width of ribs 2 lines. 
This large and strongly marked species from the number of 
its lamelle can only be confounded with the P. pluriradialis 
(Phil. sp.) and P. elongata (Phil. sp.), from both of which it dif- 
fers in its form and great size, width of ribs on the cast, absence 
of the punctures, &c. The strong primary lamelle reach the 
centre with a very slight indication of twisting ; the secondary 
ones are very delicate towards the base, but become nearly equal 
* Having examined Count Miinster's original specimens of several spe- 
cies of his genus Petraia, | have satisfied myself that they are really corals, 
as suggested by Mr. Lonsdale and others, although he describes them in his 
‘ Beitrage ’ as Gasteropods, the publication of which view prevented Prof, 
Phillips adopting the genus in his work on the Fossils of Devon and Corn- 
wall. 
Ann. & Mag. N. Hist. Ser. 2. Vol. ii. 1 
