R. Etheridge, jun. — Notes on the Gilbertson Collection. 161 



IV. — Notes on the Bivalves contained in the Gtlbertson 

 Collection, British Museum, and Figured in Phillips's 

 " Geology of Yorkshire." 



By E. Etheridge, Jun., P.G.S. ; 

 of the British Museum. 



BY far the larger proportion of the Carboniferous fossils described 

 and figured by the late Professor John Phillips, F.R.S., in the 

 second volume of his " Illustrations of the Geology of Yorkshire," 

 and published in 1836, are contained in the collection of the late 

 Mr. Gilbertson, of Clitheroe, now deposited in the Geological 

 Department of the British Museum. The early date of publication 

 of this work renders the collection described in it one of the most 

 important, next to those of Sowerby, Ure, Martin, and one or two 

 others, to students not only of British, but equally so of Continental 

 Carboniferous Palaeontology. Unfortunately the descriptions of Prof. 

 Phillips are so abbreviated and unsatisfactory, and the figures in 

 many instances so meagre, that it is with great difficulty anything 

 like an accurate determination of a species can be made by the aid 

 of them. Under these circumstances the following notes made 

 directly from the type specimens will probably be found of use ; it 

 would, however, be far more satisfactory to have the specimens 

 refigured. For convenience sake I shall commence with those 

 composing plate vi., and then take the others composing plate v. 



1. Pinna inflata, Phillips sp. (p. 211, t. 6, f. 1). 



This, as already pointed out by Mr. Davidson, 1 is Productus striatus, Fischer. The 

 Gilbertson Collection contains three specimens, but not the figured one, so far as we 

 can ascertain, although it is so stated by Prof. Phillips. 



2. Pinna costata, Phillips sp. (p. 211, t. 6, f. 2). 



I can see little or no difference between this and the ordinary Pinna Jlahelliformis, 

 Martin ; indeed this appears to have struck the author himself, for he says, " This is 

 probably the species figured by Martin under the name of Pinna Jlabelliformis, and 

 P. ?mda." Prof. M'Coy has so placed it with a note of interrogation. 2 



3. Inoceramus vetustus, Sowerby (Phillips, p. 211, t. 6, f. 3). 



The Gilbertson Collection possesses a specimen which may be one of the types of 

 this species, it is larger than fig. 3, and is not in quite such a perfect state of pre- 

 servation as that is represented, but unless there is a specimen in the Collection of 

 the Yorkshire Philosophical Society bearing a greater resemblance, this must be the 

 figured form. The original of fig. 4 I cannot trace. 



4. Avicula cycloptera, Phillips sp. (p. 211, t. 6, f. 5). 



A peculiar and well-marked species. The type is the only example in the Collection. 

 It is on a weathered limestone surface, and is scarcely so well preserved as the figure 

 represents. 



5. Avicula tessellata, Phillips sp. (p. 211, t. 6, f. 6). 



This species is referred by Professor John Morris 3 to the genus Aviculopecten. I 

 have not seen the characters of the hinge. The Gilbertson Collection contains only 

 the figured example. 



6. Pecten granosus, Sowerby (Phillips, p. 213, t. 6, f. 7). 

 This specimen is not in the Gilbertson Collection. 



1 Mon. Brit. Carb. Brachiopoda, 1861, pt. 5, p. 139. 



3 Brit. Pal. Foss. p. 498. » Catalogue, 2nd ed., 1854, p. 166. 



DECADE II. — TOL. VI. — NO. IV. 11 



