176 DEVONIAN FAUNA. 



to this species. It does not show the cell-structure, and Phillips evidently made 

 his identification only from the general shape of the frond and the fenestrules. 

 Our specimens prove that it is really totally distinct from the true JR. prisca, 

 Goldfuss, which has two undulating rows of cells and broad totally non-poriferous 

 dissepiments, and which appears to belong to the genus Lyropora. 



Very many years ago I sent two of my specimens to the late Mr. Shrubsole. 

 He labelled one of them " Betepora prisca, Phillips, now referred to Phyllopora, 

 King," and another " Phyllopora, King, figured as Gorgonia ripisteria by Phillips." 



Affinities. — The elevation and freeness of the cells distinguish it from any 

 species with which I am acquainted. 



F. A. Romer identifies his Betepora hexagona from the Calceola-beds of 

 Brilon with Phillips's O. ripisteria. In macroscopic features it looks just like 

 our Lummaton species and is doubtless nearly allied ; but, as Romer gives no 

 information as to its cell-structure, it is impossible to say whether it is specifically 

 identical ; possibly it may be distinguished by the more definitely hexagonal shape 

 of its fenestrules, though this character cannot be of much importance, as it 

 depends on their incidental arrangement. 



F. Bischoffii, F. A. Romer, 1 has a slighter network and a few scattered pustules 

 on the reverse side. As given by Giebel 2 it is more similar; but, no cells being 

 shown or indicated by the latter author, it is impossible to identify it from his 

 description. 



Of the American species figured by Ulrich the only one which at all resembles 

 it is P. Sim hi a I'd], Prout, 3 but that is easily distinguished by the much greater 

 width of the branches than of the fenestrules, and by the smaller number of cells 

 to a fenestrate. 



A specimen of P. papillata, M'Coy, 4 in the British Museum is very similar in 

 macroscopic characters though decidedly smaller, and in one part shows an 

 excentric arrangement like the Torquay specimen mentioned above. As 

 described by M'Coy, however, it is quite distinct from this species. 



2. Polypoba pagana, ii. sp. Plate XVIII, figs. 5, 5 a. 



Description. — Frond spreading. Branches undulating, about two-thirds the 

 width of the fenestrules, sub-circular in section. Fenestrules about five to the 

 length of 10 mm., and eight to the width of 10 mm., irregularly oval. Dissepi- 



1 L855, F. A. Romer, ' Beitr. Harz.,' vol. iii, p. 2, pi. i, figs. 1 a, b. 



■■ is.-,s, Giebel, ' Sil. Fauna Unterharz.,' p. 55, pi. vi, fig. 13. 



3 1N0O, Ulrich, ' Geol. Surv. Illin.,' vol. viii, p. 586, pi. lv, figs. 2—2 d. 



1 1 8 I 1 , M'Coy, ' Syn. Carb. Foss. Ireland,' p. 206, pi. xxix, fig. 10. 



