188 DEVONIAN FAUNA. 



3. Fenestella laxa, Phillips. 



1836. Fenestella laxa, Phillips. Geol. Yorks., vol. ii, p. 199, pi. i, figs. 



26—30. 

 1841. — Pal. Foss., p. 23, pi. xii, figs. 34 a, ft. 



1879. — crassa, Shrubsole. Quart. Jonrn. Geol. Soc , vol. xxxv, 



p. 280. 

 1881. — — — Ibid., vol. xxxvii, p. 186. 



Remarks. — Under this name Phillips identifies fossils from Petherwyn and 

 Croyde with those he had before described from the Carboniferous of Yorkshire. 

 His Devonian figure shows fenestrules about 10 mm. long by 5 mm. wide. 



I have met with no specimens of any Fenestella at all approaching these 

 dimensions. 



4. Fenestella poltporata, Phillips. Plate XXIII, figs. 4, 4 a, 5, 5 a. 



1836. Fenestella poltporata, Phillips. Geol. Yorks., vol. ii, p. 199, pi. i, 



figs. 19, 20. 

 ? 1844. — multiporata, M'Coy. Synopsis Carb. Foss. Irel., p. 203, 



pi. xxviii, fig. 9. 

 1879. — poltporata, Shrubsole. Quart. Journ. Geol. Soc, vol. xxxv, 



p. 280. 

 1881. — — Ibid., vol. xxxvii, p. 185. 



Description. — Zoarium composed of very large network, very irregular near 

 the base, but more regular (and rather smaller ?) in the upper parts. Branches 

 much narrower than the fenestrules, sometimes dividing at the same levels. 

 Poriferous face with a blunt augle or keel, and with obliquely flattened (or 

 excavated ?) sides, bearing (close to, but not protruding over, the margin) a row of 

 elevated, elongate, oval cell-mouths, separated by intervals of about half their 

 length. Non-poriferous face rounded (or bluntly keeled ?), roughly granulated (?). 

 Fenestrules oblong, 2 to 4 mm. in length, and about 1 mm. wide; but near the 

 base irregularly ovoid, and sometimes still longer. About eight cells to a fenestrule. 



Localities. — A fragmentary specimen, showing the cell-mouths, from the Pilton 

 beds is in Mr. Hamling's Collection, one from Pilton in the Porter Collection, and 

 three from Kingscote, Pouch Bridge, and East Anstey in my Collection. 



Remarks. — Carboniferous specimens of F. polyporata in the Woodwardian 

 Museum from Hook Head and from Settle are evidently identical with our Pilton 

 examples. In both these cases the stems seem slightly stouter and the fenestrules 



