1873/} JONES — BIVALVE ENTOMOSTRACA. 409 



3. On some Bivalve Entomostraca, chiefly Ctpeidikid^;, of the 

 Carboniferous Fokmations. By Prof. T. Etjpert Jones, F.R.S., 

 F.G.S. 



(Thia paper has been withdrawn by permission of the Council.) 



[Abstract.] 



Bivalved Entomostraca are abundant in many shales and limestones 

 throughout the Carboniferous formations ; in the lists published 

 in the ' Transactions of the Geological Society of Glasgow' (vol. ii. 

 1867, and vol. iii. suppl. 1871) upwards of 50 species are enumerated 

 as known in the coal-fields of Western Scotland alone. Other 

 species have since been recognized in that and other localities. 

 Some of the larger forms of Ostracoda are not rare in the Carboni- 

 ferous Limestone of Belgium and the British Islands; and, indeed, 

 in some instances they are so plentiful as to constitute masses or bands 

 of limestone, as at Longnor (Derbyshire), Bolland (Yorkshire),, 

 Bathgate (Scotland), Poolvash (Isle of Man), Caldy Island (South 

 Wales), Kilaare (Ireland), <fcc. Here and there in the Coal-shales 

 some large fo^ms, especially Cypridince, also occur. 



Many years ^go some of these larger Ostracods were figured and 

 described by Professors J. PhiUips (1836), M'Coy (1839), and De 

 Koninck (1841), and their Entomostracal relationship pointed out. 

 The collections made by M. J. Bosquet, E.C.G.S., in Belgium, Mr. 

 Joseph Wright, E.G.S., at Cork, Ireland, Mr. J. H. Burrow, M.A., at 

 Settle, Yorkshire, Mr. Young, Glasgow, Mr. Grossart, Salsburgh, 

 Dr. Bankin, Carluke, and others, and submitted to the author and 

 his friend Mr. J. W. Kirkby, have elucidated many obscure points 

 in the history of these old Entomostraca. Numerous other speci- 

 mens from Ireland, Scotland, Yorkshire, Derbyshire, and the Isle of 

 Man, communicated by friends, have also been studied ; and the 

 results will be given in detail in a Monograph by Messrs. Jones and 

 Kirkby, to be published by the Paleeontographical Society, and now 

 in the press. The main points of geological interest arrived at are 

 as follows : — 



The Entomoconchtts of M'Coy proves to have the Cypridinal 

 character of anterior sinus and gape, as intimated by Messrs. Jones 

 and Kirkby in 1863 (< Eept. Brit. Assoc' for 1863, Tr. Sect. p. 80) ; 

 and besides E. Scouleri, M'Coy, which is found in Belgium, York- 

 shire, and Ireland, together with a variety ovalis (Ireland), two 

 other species have now been determined, E. orbicularis (Cork, 

 Ireland) and E. ghbosus (Beith, Scotland), thanks to the researches 

 of Mr. Joseph Wright, F.G.S., of Belfast, and Mr. John Young, of 

 Glasgow, respectively, all from the Mountain Limestone. 



A closely allied genus Offa* is also indicated, in which the sinus 

 and gape are very slightly pronounced, in a carapace otherwise 

 somewhat resembling the foregoing. Only one species, 0. Barran- 

 diana (Cork, Ireland), is as yet known. 



M'Coy's " Daphnia primceva " belongs to Cypridina proper 

 * Offa, a pellet. 



