GENERA OF FAVOSITID&. 87 



spiniform, and the mural pores are much smaller. (The only 

 variety of P. cervicornis in which I have observed comparatively 

 numerous tabulae is that from the Devonian rocks of Devon- 

 shire, and I have already given reasons for thinking this to be 

 probably at least varietally distinct from the Eifel form, if not 

 a good species.) 



Formation and Locality. Abundant in the Devonian Lime- 

 stone of Gerolstein in the Eifel. Also not uncommon in the 

 Corniferous Limestone of Wainfleet, Ontario. [Quoted by 

 Milne-Edwards and Haime as occurring in the Devonian of 

 France, Belgium, Germany, Spain, Turkey in Europe, and 

 Britain.] 



Pachypora cristata, Edwards and Haime, sp. 

 (PI. IV., figs. 4-4$, and PL V., figs, i-i b.) 



(?) Madreporites cristatus, Blumenbach, Comment. Soc. Scient. Gott, t. xv. 



p. 154, PL III., fig. 12, 1803. 

 Favosites polymorpha, Lonsdale, in Murchison's Silurian Syst., p. 684, PL 



XV., fig. 2, 1839. 



Lonsdalei, D'Orbigny, Prodr. de Paleont, t. i. p. 49, 1850. 

 cristata, Milne-Edwards and Haime, Pol. Foss. des Terr. Pal., p. 

 342, 1851 ; and Brit. Foss. Cor., p. 260, PL LXL, figs. 3 and 4, 

 1854. 



Calamopora cristata, Fr. Schmidt, Sil. Form, von Ehstland, p. 239, 1858. 

 cristata, Ferd. Roemer, Sil. Fauna des West. Tennessee, p. 20, PL 



II., fig. 12, 1860. 



Favosites Lonsdalei, Lindstrom, Ofversigt af Kongl. Vetensk. Akad. ForhandL, 

 1873, P- 22. 



Spec. Char. Corallum dendroid, or sometimes sublobate; the 

 branches generally cylindrical, often irregularly swollen, from two 

 to four or five lines in diameter, dividing at frequent intervals, 

 and terminating in rounded ends. Corallites radiating from 

 the axis of the corallum, and diverging outwards to open on 

 all parts of the free surface ; their walls thickened by scler- 

 enchyma, especially in the neighbourhood of their mouths. 

 Mural pores few in number, apparently uniserial or irregular. 

 Calices rounded, encircled by greatly thickened margins, and 

 usually of two principal sizes, the larger ones often nearly or 



