536 MM. Jones and Kirkhy — On Carboniferous Ostracoda. 



exposed in most parts of the district, in both natural and artificial 

 sections. Generally speaking it is not rich in fossils ; and, when 

 they are present, they are difficult to extract owing to the hardness 

 of the rock. Hence, with one exception, the Ostracoda have not 

 been obtained from the limestone itself, but from the shaly partings, 

 or intercalated thin beds of shale, that are occasionally (though rarely) 

 present in it. Most of these more argillaceous bands appear to come 

 in near the base of the Limestone, as at Arnside, Sandside, and 

 Heversham ; but there is one bed (perhaps more) of shale some- 

 where near its centre, as at Kendal, Kent's Bank, and Stainton. 

 In one locality, near Storr Moss, the limestone, just beneath the turf, 

 was somewhat decomposed and pretty full of Entomostraca, which 

 were easily got out. 



The Yoredale rocks are not well seen, and we have been able to 

 examine only one good natural section of them (Holker Park). In 

 Furness, where they have been proved to be of considerable thickness, 

 they are usually covered by superficial deposits, and thus not easily 

 to be got at, except where brought to the surface by the sinking of 

 ironstone-pits and wells, or where quarries and railways have cut 

 into them. The presence of this series of beds in Furness was, we 

 believe, first noticed by the Survey Geologists ; and it may be here 

 mentioned that the maps and memoirs which they have published on 

 this region have been of considerable service to us in examining the 

 district for Ostracoda. 



In working the shales for these microzoa, we have followed the 

 usual method of washing (or boiling) away the earthy matter from 

 the organic contents of the different samples collected, and sorting 

 what is left by sifting, preparatory to picking out the Entomostraca 

 with a watch-maker's lens and sable pencil. 



Besides Ostracoda, most of our washings contain Foraminifera ; 

 and some of those from the Yoredale rocks are rich in Polyzoa ; ^ the 

 latter especially in the shales from Holker Park and Gleaston Castle. 



The marks * and **' prefixed to the species in the following lists 

 indicate their relative local abundance. 



I. — Localities in the Soar-Limestone. 

 1. Arnside. — The best locality we have met with for Ostracods in 

 the Scar-limestone is near to Arnside, where what appears to be 

 the lowest beds of the series come up, on the shore, half a mile to 

 the west of the village. These beds have shaly partings, and in some 

 places become decidedly argillaceous in character. From various 

 washings of the softer portions we have obtained the following 

 species, — associated with Foraminifera, Polyzoa, Crinoids, and a few 

 Brachiopods : — 



*Beyrichia eraterigera, G. S. Brady,MS. 

 B. , sp. 



*Eirkbya umhonata (D'Eichwald). 



*Leperditia Okeni (Miinster) . 

 L. suborbiculata (Miinster). 

 L. ohlongo, J. & K. 

 L. acuta^ J. & K. 

 L. ohesa, sp. nov. MS. 



K. tricolUna, sp. nov. MS. 

 **Vytherella valida, J. K. & B. 



^ The Polyzoa met with have been handed to Mr. G. R. Vine. 

 ^ This was originally published as L. Okeni, var. acuta ; but we now prefer to 

 give this and some other iorms a specific, instead of a varietal standing. 



