GENERA OF FAVOSITID^. 87 



spinlform, and the mural pores are much smaller, (The only 

 variety of P. cervicoiniis 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 varictally 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 PI. V., figs, i-i ^.) 



(?) Aladreporites crts/atus, Blumenbach, Comment. Soc. Scient. Gott., t. xv. 



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

 Favosites po/ymorJ>/ia, Lonsdale, in Murchison's Silurian Syst., p. 684, PI. 

 XV., fig. 2, 1839. 

 „ Lonsdalei, D'Orbigny, Prodr. de Pale'ont., t. i. p. 49, 1850. 

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

 342, 185 1 ; and Brit. Foss. Cor., p. 260, PI. LXL, figs. 3 and 4, 

 1854. 

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

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



II., fig. 12, i860. 

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

 1873, p. 22. 



Spec. C//^;'.—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 radiatinof 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 



