170 EEPORT— 188L 



I arrange these genera and species, not because they are allies, but 

 because they are the reverse of that. The genera are as distinct as 

 genera can be, yet they have been confounded by authors. The 0. 

 disticha of Goldfuss is, I think, distinctly an Upper Silurian type. The Bala 

 type of Glauconome is a different genus ; and Bamipora, as described by 

 Toula, has five or six rows of irregular pores. The genus Ramijpora 

 is a Permo- Carboniferous type, and although having some facial resem- 

 blance to the species from the Bala beds, and figured as Bamipora, var. 

 carinata, Bth. Jun.', by Mr. Robert Etheridge, Jun., the two forms differ 

 in many respects considerably. Bamipora is much larger naturally than 

 the Bala Olauconome ; the cells are differently arranged. In the Lower 

 Silurian species, both the primary and the secondary branches bear two 

 rows of alternately arranged cells. Having handled and carefully examined 

 the specimen in the School of Mines, figured by Mr. R. Etheridge, jun., 

 Bamipora Hochstetteri, var. carinata, 'Eth., I can bear willing testimony to 

 the faithful delineation of this beautiful type. 



There are several specimens of this as yet undescribed genus in the 

 collection already named, and their study will afford a good general idea 

 of the varying habit of the species. 



1844. Polypora, M'Coy. 



Zoarium a delicate, reticulated, calcareous expansion. Branches round, 

 from three to five rows of cell-openings — margins usually not projecting, 

 branches connected (occasionally) by thin dissepiments. 



This genus is represented by only one species, P. crassa, Lons., in the 

 Wenlock Limestone, Dudley. The genus was more fully represented in 

 America in the Devonian strata, — in our own country — in the Arctic 

 regions — and India during the Carboniferous epoch. Professor Nicholson ^ 

 describes and figures three species : P. pidcliella, Nich., P. tenella, Nich., 

 P. tuberculata, Nich. As a P. tuberculata has been previously described 

 byProut^ the name of Nicholson is rather unfortunate, as there is a 

 difference in the two species, for Nicholson says his is allied to P. verucosa, 

 M'Coy, and as such it differs fi'om Prout's P. tuberculata, if the identifica- 

 tions of the Messrs. Young be correct. P. pidcJiella and P. tenella are 

 nearly allied to P. Malliana, Prout, which occurs ' in the St. Louis 

 Group of Illinois, and which I have likewise detected in the Corniferous 

 formation of Ontario.' — Nicholson. 



I have now gone over all the genera wherein the cell-characters are 

 either ovate or sub-tubular, without saying arbitrarily that these genera 

 and species belong to the Ctclostomata. I have begun with the species 

 having the nearest apparent afiBnities with the Cheilostomata, and then 

 allowed the others to fall in, in a consecutive order. This temporary 

 arrangement will be better for the present, and this will allow time for a 

 proper classification when the whole of the Pateozoic Polyzoa have been 

 more closely studied. The following genera I have not the least hesita- 

 tion in placing with the Cyclostomata as at present understood. 



1859. Cyclostomata, Busk. 



' Cell tubular ; orifice terminal, of same diameter as the cell, withont 

 any moveable apparatus for its closure ; consistence calcareous.' ■• 



' Geo. Mag. 1879. 2 j^g^ Devonian Fossils, Geo. Mag., 1874. 



' Trans, of Acad, of Science, St. Louis, Geo. Mag., June, 1874. 

 * Monograph of the Crag Polyzoa, p. 9. 



