168 REPOBT— 1881. 



Shrnbsole's work I am inclined, generally, to agree. He may be blamed for 

 the limitation of species, but the fault lies not with him, but with authors 

 who have introduced into our scientific literature specific names for frag- 

 ments that were really portions only of other species. This has already 

 been pointed out, but much yet remains to be done before the family can 

 be considered to be completely revised. It may then be necessary to 

 reintroduce one or two species which are now regarded as synonyms, and 

 also to establish two or three new ones. For the present I can do no 

 other than report on the literature and species which have not yet found 

 a place in the revisions of Mr. Shrubsole. 



Gorgonia assimilis, Lousd., Murch Sil. 



Fenestella „ Cat. Cambrian and Sil. Fos. School of Mines. 



This species has been alluded to in Mr. Shrubsole's second paper 

 (p. 247). In the above catalogue it may be found among the Caradoc 

 and Wenlock Limestone series of Polyzoa. This species has not been 

 described, and there seems to be a doubt whether it should be referred to 

 Fenestella or Retepora (Phyllopora).* 



Many of the earlier specimens — Caradoc and Up. Llandovery — are 

 very indistinct, and complete identification seems to be impossible. The 

 type is a peculiar one, but after going over the specimens I can make out 

 the following characters. The zoarium is irregular and dichotomously 

 branching, no regular dissepiments or fenestra). The frequent bifurca- 

 tions of the branches, by infringing upon the lower branches, are the 

 only means by which fenestree are formed ; the number of pores on either 

 side of these vary fi-om ten to thirteen. I cannot therefore suppose that 

 these earlier Fenestella assimilis of the Catalogue are in any way related to 

 Fenestella reteporata, Shi'ubsole, of the Wenlock Limestone, So far as I 

 am able to judge from the specimens, tliey are totally distinct. 



The whole of the type specimens of Upper Silurian Fenestella, Mr. 

 Shrubsole has gone over carefully ; but as many of these were mere frag- 

 ments of the reverse, showing no cell-arrangement, he found them alto- 

 gether valueless for accurate definition. In consequence of this revision the 

 whole of the Upper Sil, Fenestellid^ i«i^put down by him as follows : — 



F&tiestella rigidtda, M'Coy, ' Brit. Pal. Fos.' p. 50, pi. i. C. fig. 19. 

 „ reteporata, Shrubsole, ' Qt. Jour. Geo. Soc' May, 1880. 

 ,, lyneata ^ ,, „ „ ,, „ 



„ intermedia „ „ „ ,, „ 



All these species are found in the Wenlock Limestone, Dudley, and two 

 of them — if not three — in the Niagara Limest., Lockport, America. 



Of the Devonian Fenestella but few species are recorded. But as 

 Professor Nicholson has published his papers in this country, we are 

 largely indebted to him for what little is known, besides those that are 

 figured and described by Goldfuss and Phillips. 



1826-33. Betepora (Fenestella) prisca, Gold.^ Eifel. 



,, „ _ „ antiqua, „ ,, 



1841 . Fenestella antiqua ; anthritica ; an d Hemitrypa oculata, Ph .^ 



■ 'A Review of the Carb, Fenestellidae,' QiiaH. Jov/rn. of Geo. Soc. May 1879 ; 'A 

 Review of the Various Species of Up. Sil. FenesteUidse, Quart. Jowrn. Geo. Soc. May, 

 1880; ' Further Notes on Carb. Fenestellidje,' ibid. May, 1881. 



- Petrefac. Ger. tab. 36, fig. 19, tab. 9, fig. 10. 



' Phillips' Palce. Fos. Devon, S;c. 



