504 PKOE. T. E. JONES AND MH. J. W. KIRKBT ON OSTEACODA OP 



The calcareous shales of the Yoredale rocks contain ma,T\j species. 

 In the lower beds there occur some of the more characteristic forms 

 of the Lower Carboniferons, in the two northerly counties at leasts 

 such as CytJierelJa valida, Beyrichia craterigera^ and KirTchya costata ; 

 but these do not range very far upward. 



The forms peculiar to the Toredales are : — Leperditia lovicensis, 

 Beyrichia ventricornis, B. hituherculata^ KirTchya Urei, Bythocyihere 

 Youngiana, Bythocypris Phillipsiana. var. carhonica, Phreatura con- 

 cinna, Cythere ? cornigera, Bairdia legumen^ and B. mucronata. 



We have no determinable species from the Millstone Grit. 



Prom the Lower Coal-measures (ci) have been obtained Beyrichia 

 arcuata * and Garhonia ? sp. 



From the Middle or main group of the Coal-measures (5) the 

 last-named Beyrichia is a common fossil ; so also is Carhonia fabu- 

 lina. Of less common occurrence are Philomedes elongata, Carhonia 

 Ranhiniana, C. secans^ C. scalpellus^ and C. Wardiana. 



Then in the Upper Coal-measures {a) reappears Beyrichia suh- 

 arcuata, and in the " Spirorbis Limestone " of this group Leperditia 

 inflata. These seem to be the last occurring Carboniferous Ostracods 

 in England. 



§ 2. Of the area of " England South " our materials are not as yet 

 sufficient to allow anything like a complete sketch to be given of 

 the vertical distribution of the species. 



[Note. — Since this paper was written we have examined and 

 described f a set of Carboniferous Ostraeoda from the Gayton Boring, 

 J^orthamptonshire. These Ostracods were obtained, at a depth of 

 over 700 feet from the surface, in shaly beds, evidently identical 

 with the Lower Limestone-shale. The shales were kindly supplied 

 by Mr. H. J. Eunson, E.G.S. Six species were determined (one of 

 which was new to us, and the other five were well-known Lower 

 Carboniferous forms of Scotland and the North of England), namely, 

 Kirhhya variabilis, K. plicata, Cytherella eoctuberata, C. attenuata, 

 Bythocypris stiblunata, and Macrocypris Jonesiana. 



Quite recently Mr. E. Wethered, E.G.S., of Cheltenham, has 

 favoured us with specimens from the Lower Limestone-shale of the 

 Eorest of Dean. Curiously enough these specimens are almost 

 exactly similar in species and individual abundance to those of the 

 Gayton Boring. 



From the Forest of Dean came KirTchya variabilis, K. plicata, 

 Cytherella extuberata, Bythocypris sublunata, and Darwinula herni- 

 ciana (?).] 



In the Carboniferous Limestone of Shropshire, South Wales, and 



* B. arcuata is said to occur at Sbaly Brow, in the Wigan coal-field, in the 

 roof of one of the Gannister coals, where it is associated with Aviculopecten 

 papyraceus and Goniatites Listeri. It would be of interest to have this corro- 

 borated, and to learn whether it occurs in other of the Aviculopecten-hdiiidiS, of 

 the Lower Coal-measures, and just of as much interest to know if other 

 Ostracods are found with it under these conditions. 



t Geol. Mag. dec. iii .vol. iii. 1886, p. 248, pi. 7. 



