98 



BRITISH SILURIAN BRACHIOPODA. 



triangular, of small dimensions ; fissure partly margined by a deltidiura. Two specimens 

 measured — 



Length 5, width 6, depth 4 Hnes. 

 „ 5, „ 5, „ 3 „ 



Obs. As already stated in our observations on Sp. sulcata, this shell, in 1826, 

 1827, and 1828, Avas considered by Hisinger and Dalman to be identical with the Anomia 

 crispa of Linnaeus, and it was only in 1831 that the first-named author found out his 

 mistake. Since then, the same error, which originated in 1826, has been reproduced by 

 all subsequent palaeontologists, with the exception of Lindstrom. We will, however, 

 retain the name of crispa, Hisinger (not of Linne), for the shell under description, as the 

 term has been so generally made use of in this country as well as upon the Continent by 

 every geologist and palaeontologist who has had occasion to refer to it. My friend 

 Lindstrom writes me, that he feels uncertain whether the species occurs in our British 

 Silurian rocks; but, after having compared several Gothland specimens of 8p. crispa with 

 others found in England, I can see no difference ; and it may be here remarked, that 

 Hisinger's figure is taken from a very young shell, and does not well represent the exact 

 characters of fully developed specimens of his species.^ 



Position and Locality. 8p. crispa occurs in May Hill Sandstone or Upper Llandovery 

 at Ankerdine Hill : Woolhope Limestone, west of Worcester Beacon ; Wenlock Limestone 

 and Shale, Clungunford, Shropshire ; Craig-y-Garcyd, Usk River ; Dudley ; Callow 

 Parm, &c., Abberley; Rock Farm and Checkley Common, May Hill; Canwood and 

 Dormington, Woolhope district ; in Lower Ludlow at Eastnor Castle, Ledbury ; Hole 

 Farm, Abberley ; Aymestry Limestone, at Ridge Hill Farm, Abberley (Phillips and Salter) . 

 It is a very common fossil in the Upper Silurian. 



It occurs also in Wenlock Rocks near Llandeilo (M'Coy) ; Marloes Bay, Pembroke- 

 shire ; near Llangollen; Dunquin and Ferriter's Cove, Co. Kerry (M'Coy). 



In Scotland it has been found by Mr. Henderson, in the Upper Silurian (Ludlow) 

 Shales, at Deerhope Burn, in the Pentland Hills ; and it occurs in the Wenlock Lime- 

 stone at Kirkby Moor. 



It occurs in Gothland ; also in Oesel, according to Professor Schmidt ; and in the 

 Niagara rocks of New York, according to Prof. Hall. I do not feel certain, however, 

 whether the American fossil really belongs to Hisinger's species. 



1 Hisinger describes his Delthyris crispa as follows: " Testa transversali, convexo-gibba, longitudi- 

 iialiter 5 — 6-plicata et subtiliter transversim striata; foramine magno deltoideo, natibus remotis." 

 Dalman's description is exactly similar, and he has copied Hisinger's figure. 



