The Levenshulme Limestones. 47 



On the Entomostraca and Annelida in the Levenshulme 

 Mottled Limestones. By Wm. Brockbank, F.L.S.> 

 F.G.S. 



(Received December 2nd^ i8go.) 



The British fossil Entomostraca from the Carboniferous 

 formation have been described and figured, by Professor 

 Rupert Jones and others, in the monograph issued by the 

 Palaeontographical Society in 1884. 



All the figures there given were taken from fossils 

 collected from the ironstones, limestones, and shales of the 

 coal measures ; chiefly from Carluke in Scotland. In one 

 case 300 were found in a fish coprolite, and in another a 

 large number were collected from the debris of decomposed 

 limestone in a crevice traversing the rock, which had formed 

 a subterranean water course ; the limestone having been 

 disintegrated by the solvent and mechanical action of the 

 water. A few had been collected from the limestones of 

 Settle and Bolland. I cannot, however, find any instance 

 of microscopical examinations of limestone for Entomostraca, 

 except a brief reference in the anniversary address of 

 Mr. Sorby to the Geological Society in 1879. He there 

 describes the microscopical structure of different limestones, 

 and states that " the Burdie-house limestone is mainly 

 composed of fine grained particles, the exact origin of which 

 cannot be proved ; but scattered through it are many 

 Entomostraca with well-preserved structure." "The lime- 

 stone of Ardwick, near Manchester," he says, "is very 

 similar, but, in addition, it contains many entire or broken 

 shells of Micfoconchiis, with a well-preserved laminar 

 structure, clearly showing that it is an annelid." 



This paragraph was shewn to me by Mr. de Ranee after 

 I had completed the investigation of the structure of the 



