Mr. T. Gray on a new species of Strombus, 429 



relation to my L. crassistria and sulcata, with which M. de 

 Koninck unites it) ; but as I there described the width as rather 

 greater, and do not give the absolute dimensions of the fine stria?, 

 I hesitate to unite them without a comparison of specimens. 



Very abundant in a piece of the black upper carboniferous 

 limestone of Derbyshire. 



{Col. University of Cambridge.) 



Lingula latior (M^Coy). 



Desc. Broad ovate anteriorly, gradually acuminated posteriorly ; 

 moderately convex towards the beak, very gradually flattened 

 towards the margins ; sides meeting at the beak at an angle 

 of about 75° ; front wide, semielliptically rounded ; greatest 

 width at about the middle of the length, from whence the 

 posterior end is rapidly narrowed to the beak ; surface with 

 fine, sharply defined, strong, close, elevated, obtuse, concentric 

 striae slightly irregular from occasional branchings and inter- 

 ruptions, crossed in parts by longitudinal microscopic strise. 

 Length 41 lines, proportional width ■^-^■^. 



Distinguished from the other described Carboniferous Lingula 

 by the very wide ovate form of its anterior end, and the great 

 comparative length and straightness of the posterior lateral edges, 

 which, by their convergence at so small an angle, give the re- 

 markable posterior attenuation or pointed beak, characteristic of 

 the species. 



Not very uncommon in the black limestone over the main 

 limestone of Derbyshire. 



{Col. University of Cambridge.) 



XLII. — On a species of Sti'ombus in the Hunterian Museum at 

 Glasgow. By Thomas Gray, Esq., Glasgow*. 



In the collection of shells bequeathed to the University of Glas- 

 gow by the late celebrated Dr. William Hunter, and preserved 

 in the museum which bears his name, there is one interesting 

 species which deserves to be recorded. The specimen in question 

 is a Strombus, belonging to that section of the genus of which 

 S. vittatus and S. qndromis form part, and what is very remark- 

 able, a sufficiently characteristic figure of it is given in the ad- 

 mirable ' Historia Conchyliorum ' of our countryman Dr. Martin 

 Lister, published in London in 1685. The shell is engraved on 



* Communicated by the Author, having been read before the Natural 

 Historj' Society of Glasgow. 



