174 Messrs. Jones and Kirkby on the 



XVI. — Notes on the Palcrozoic Bivalved Entomostraca. — 

 No. XIX. On some Carboniferous Species of the Ostraco- 

 dous Genus Kirkbya, Jones. By T. Rupert Jones, F.R.S., 

 and James W. Kirkby, Esq. 



[Plate III.*] 



This genus was established in 1859 for the reception of the 

 species, K. permiana, Jones, from the Magnesian Limestone 

 of Sunderland. The Carboniferous species, K. Urei, Jones, 

 discovered by the Rev. David Ure near Rutherglen, about the 

 year 1793, was at the same time recognized as belonging to 

 this group f. 



Previous to this, Professor M'Coy, in 1844, had described 

 and figured, as Cythere costata, another and very character- 

 istic member of the genus, from the Carboniferous Yellow 

 Sandstone of Ireland \. 



In 1854, Prof. Dr. A. E. Reuss figured and described his 

 Kirkbya Rcessleri (as a Cythere) from the Lower Zechstein of 

 Bleichenbach § ; and in the same year Count Keyserling 

 figured and described, as Cythere Sckrenkti, C. sticta, and 

 C. grapfa, three Kirkbyoi from the Permian strata on the 

 Pinega in North-eastern Russia [|. 



Somewhat later, in 1860, M. E. d'Eiehwald described and 

 figured Beyrichia umbonata and B. striolata, two species which 

 we refer to Kirkbya, from the Carboniferous Yellow Shale of 

 Russia 1|. 



In 1867 nine species of Kirkbya were given in our List of 

 Entomostraca occurring in the Carboniferous rocks of Scot- 

 land. Six of these were new**. 



In 1869 one species, K. fibula, Jones and Holl, was de- 

 scribed from the Silurian rocks of Malvern ft- 



Kirkbyte are also referred to in Mr. Smith's list of Silurian 

 Entomostraca (1881, Geol. Mag. dec. 2, vol. viii. p. 73), and in 

 Mr. Vine's (1882, Quart. Journ. Geol. Soc. vol. xxxviii. p. 48). 



* This Plate has been drawn with the aid of a grant from the Royal 

 Society for the illustration of the fossil Biralved Entomostraca. 



t Trans. Tyneside Field-Club, vol. iv. p. 129. 



\ Syn. Char. Carb. Foss. Ireland, p. 165, pi. xxiii. fig. 11 ; Ann. & 

 Mag. Nat. Hist. ser. 3, vol. xviii. I860, p. 43. 



§ Jahresb. Wetterau. Gesellsch. Naturk. Hanau, 1851-53, 1854, p. 70, 

 pi. O. fig. 11a, b. 



|| In A. G. Schrenk's ' Reise nach dem Nordosten d. Europ. Russ- 

 lands,' part 2 (8vo, Dorpat, 1854), p. 112, pi. 4. figs. 37-39. 



% Lethtea Rossica, I. vii. p. 1347, pi. 52. fig. 10, & p. 1348, pi. 52. 

 fig. 14 ; Ann. & Mag. Nat. Hist. ser. 4, vol. xv. 1875, pp. 53, 54. 



°** Trans. Geol. Soc. Glasgow, vol. ii. pp. 213-228, and vol. iii. Suppl. 

 1871, p. 28. 



-ft Ann. & Mag. Nat. Hist. ser. 4, vol. iii. p. 224, pi. xv. fig, 9. 



