Messrs. Jones and Kirkby on Carboniferous Entomostraca. 37 



stated that a band of freshwater limestone stretches from Nobold 

 near Shrewsbury to Asterley beyond Pontesbury, and is found 

 in the Coal-measures between Westbury and Pontesbury ; and 

 it is described as containing Cypris inflata, together with Spi- 

 rorbis [Micro conchus) carbonarius, and as being equivalent to the 

 Ardwick limestone, in which this latter little fossil also abounds. 

 This Spirorbis-limestone occurs also in the uppermost Coal- 

 measures of Warwickshire. See Geol. Survey MemoirSj 1859. 



Mr. J. W. Salter has obtained for us, through the kind aid 

 of Mr. R. Wilding, of Church-Stretton, a specimen of the 

 whitish so-called "freshwater" limestone of the Upper Coal- 

 measures of Lee-Botwood, Shropshire, This contained a few 

 specimens of a dwarf Leperditia and many minute Spirorbes^ 

 (Microconchi) . Mr. E. W. Binney has also favoured us with 

 specimens of the same Spirorbis-limestone from Ardwick, near 

 Manchester ; Prizely, Shropshire ; Rough Gill near Galescales, 

 Carlisle ; and from the banks of the Ayr near Catrine, Ayrshire. 

 Some of these specimens enclose imperfect individuals of the 

 same dwarf Leperditia. In another specimen of the white lime- 

 stone that we have seen in the Ludlow Museum, Spirorbis 

 abounds, but no Entosmostraca are visible. 



On account of the compact and crystalline condition of this 

 rock, it is very difficult to manipulate the little bivalve carapaces, 

 or their representative casts in the limestone ; but, though not 

 80 successful as we wished, we had evidence of such a little 

 Leperditia as that figured by Murchison and mentioned above ; 

 and we have no doubt that this is very similar to L. Scoto- 

 burdigalensis, its greater breadth or ventricosity alone dis- 

 tinguishing it. Hence we may keep the varietal name L. inflata 

 for the gibbous dwarf form of L. Okeni occurring in the south, 

 whilst L. Scotoburdigalensis is an equally small, but less swollen^ 

 dwarf variety, found in the north of Britain, as well as in Ire- 

 land. 



1839. M'Cq}/.— In 1839 Professor F. M'Coy figured and 

 described as Entomocorichus Scouleri, in the Journal of the 

 Geological Society of Dublin (vol. ii. p. 91, pi, 5. figs, a—e), a 

 large globose bivalved Entomostracan, common in some parts of 

 the Mountain-limestone, both of the British Isles and the Con- 

 tinent. This form had already been recognized as occurring in 

 the Mountain-limestone of Yorkshire (Bolland) by Professor 

 John Phillips, and referred to by him in his * Geology of the 

 Mountain-Limestone District of Yorkshire,^ pages 240 and 251, 

 as a " Cypridiform shell," but not described, though sketches of 



* Spirorbis {Microconchus) is abundant also in some of the limestones 

 of the Middle and Lower Coal-measures and of the Limestone-shales 

 (Ireland). 



