THE ANNALS 



AND 



MAGAZINE OF NATURAL HLSTORY. 



[SECOND SERIES.] 



" perlitora spargite museum. 



Naiades, et circClm vitreos considite foiites : 

 Pollice virgineo teneros hic carpite flores : 

 Floribus et pictum, diva, replete canistrum. 

 At vos, o Nymphse Craterides, ite sub undas ; 

 Ite, recurvato variata corallia trunco 

 V'ellite muscosis e rupibus, et mihi conchas 

 Ferte, Dese pelagi, et pingui concliylia succo." 



N.Parthenii Giannettasii Eel. I. 



No. 13. JANUARY 1849. 



I. — On some new genera and species of Palaeozoic Corals and Fora- 

 minifera. By Frederick M'Coy, M.G.S. & N.H.S.D. &c. 



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 lamellse reaching to 

 the centre ; each of those ribs is divided by a tine mesial sulcus, 

 the remains of the intermediate lamellae, not reaching to the 

 centre, making the total number of lamellse about eighty. 

 Length of imperfect cast 2 inches 7 lines ; width of long axis 

 at base 1 1 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 lamellae 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 lamellae 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, I 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.m. 1 



