ON FOSSIL rOLYZOA. 169 



1874. Feneslella magnifica, Nicliol. ' Geo. Mag. ' 1874, pi. ix. 

 „ ,, marginalis, „ „ „ „ „ 



„ „ fiUformis „_ _ ,, „ „ ,, 



„ Eetepora (Fenestella) PhilUpsl „ „ „ 



Many, if not all, of these species are founded upon fragments, or on the 

 reverse only of specimens ; and according to the laxness or rigidness with 

 which they are examined, their value in a scientific criticism is of variable 

 importance. They are nevertheless links in the chain of evidence, and 

 until they are displaced by better specimens, which, of course, will allow 

 of better work, they should find a place in this Report. Nicholson, with 

 others, uses the term Retepora very indifferently. Speaking of i?. 

 Phillipsi, he says, ' This is a genuine Betepora, and in its general form and 

 its biserial cells is closely allied to R. prisca, Gold., which I have found 

 abundantly in the Corniferous Limestone of Ontario.' As I have already 

 placed Goldfuss's B. prisca with the Fenestellid^, I cannot do otherwise 

 with this one. 



In addition to this species Nicholson founded two new genera for 

 Devonian Fenestella : — 



1874. Gryptopora, 'An. Mag. Nat. Hist.' Feb. 1874. 

 ,, Carinopora „ „ „ „ „ 



Two species — Gryptopora mirahilis, Nich., and Garinopora Hindei — 

 Nicholson places to these new genera. With all due respect for Professor 

 Nicholson and his work, I must take his admission that these are 

 apparently Fenestellidce, and as such there was, I am inclined to think, no 

 need for founding new genera for their reception. The author refers to 

 Hemitrypa, and, in one sense, compares his genera with the genus of 

 M'Coy. Unfortunately for the fate of all three genera, we have only 

 true Fenestella encrusted by a coral, and the diagnosis of the species 

 given by both authors is encumbered with partly coraline and partly 

 polyzoal structures. All the illustrations which Professor Nicholson gives 

 are structures found in typical Fenestella,' with the exception of Fig. 2 g, 

 p. 81. Here the 'carina,' or keels, are apparently united by 'stolons,' 

 which may b6 sections of the tabulte only of the encrusting coral. Fig. 

 / is without this ' stoloniferous ' connection, but both are sections of 

 branches cut through perpendicular to the surface, and showing the 

 largely developed keel, with the transverse section of the cells. Fig. i is 

 one of these, isolated. It would be better to view the structures reversed. 

 Figs, d and e are evidently ordinary Fenestella, and the sections above 

 described are portions of the same frond.^ The development of the keel 

 is remarkable, and speaking of G. Hindei Nicholson says, ' The thickness 

 of the frond, measured at right angles to its plane of growth, is one line 

 or a little more, nearly two-thirds of this being accounted for by the great 

 internal keels.' This is equalled by the species F. Lyelli, Dawson, which 

 is figured and partly described in ' Acadian Geology.' ^ 



1826-33. Glauconome disticha, Goldf. Petr. Germ. 



1874-5. Bamipora, Toula, Permo-Carbon. Fossilien.'' 



? 1878, „ Hochstetteri, Toula, Bigsby, Devonian Carboniferous. 



1879. „ „ var. Garinata, R. Eth. Jun. ' Geo. Mag. '1879. 



' See the illustration in the An. Mag. of iV. Hist. Feb. 1874. 



* I wish the reader to refer to Nicholson's paper as given above. 



* Carb. Limestone, pp. 288-9. 



* See Arctic Pal, Polyzoa, E. Etheridge, Jun., 1878. Jour. Geo. Society. 



