506 PEOF. T. E. JONES AKD ME. J. W. KIEKBT ON OSTRACODA OF 



YI. Range of Beitisbt Caebonifeeotjs Osteacoda in Noeth 

 Ameeica and Eueope. 



§ 1. Among the British species already found in other countries, 

 perhaps Cytherella Benniei and C. concinna enjoy the greatest range, 

 as they are met with in the Coal-measures of Iowa in the one case, 

 and in the Carboniferous Limestone of the same State in the 

 other *. 



In the Carboniferous rocks (Coal-measures and Lower Coal- 

 measures) of Nova Scotia the following species are known to 

 occur : — Leperditia OJceni, L. scotoburdigalensis, L. acuta, Carhonia 

 fahidina, and C. bairdioides (?) t. 



These are all the British Ostracods whose range is as yet known 

 to extend to the American continent. Two of them (Leperditia 

 scotoburdigalensis and Oarbonia fabulina) were essentially estuarine 

 forms. They are the commonest species of all in the Coal-measures 

 and Calciferous Sandstones of the North British area ; and their 

 constant occurrence in shales, ironstones, and impure limestones 

 (intercalated with coals), associated with the remains of plants, 

 indicates that they were anything but of deep-sea habits. 



§ 2. In Europe the following species have been described from 

 Carboniferous strata in Eussia : — Leperditia OJceni, Kirhbya umbo- 

 nata, Beyrichia colliculus, B. intermedia, Bairdia ampla, B. plebeia, 

 and Bythocypris bilobata ; and KirJcbya permiana from the Permian 

 strata of the same country X' 



Some of the best known of the British species were discovered by 

 Count Miinster in the Carboniferous Limestone of Bavaria ; these 

 include Leperditia OJceni, L. oblonga, L. parallela, L. suborbiculata, 

 CytTierella injlata, Bairdia Hisingeri, BytJiocypris bilobata, and Cy- 

 tJiere ? intermedia §. 



In Belgium, as might be expected from its comparative nearness 

 to Britain, several species occur that are included in this list. This 

 more particularly applies to the Cypridinidse ||. 



Leperditia OJceni seems to have had the greatest geographical 

 range, being found as far east as the Eussian province of Toula, 

 and as far west as Nova Scotia. 



YII. Appendix. 

 1. Betrichiopsis, gen. nov. 



Valves shaped and lobed much like those of some BeyricJiia;, but 

 bearing longitudinal riblets, as in some KirJcbycE. One of these ribs 

 forms a dorsal crest ; there is also a denticulate, spinose, or delicate 

 fringe along the free margin. These characteristic features are well 

 seen in Beyricliiopsis Jimbriata. 



* Monogr. Carbonif. Biyalvecl Entom., Palseont. Soc. 1884, pp. 77-79. 

 t Geol. Mag. dee. iii. vol. i. 1884, p. 356. 



I Ann. & Mag. Nat. Hist. ser. 4, vol. xv. 1875, p. 52; and 'LethisaEossica,' 

 1860, vii. p. 1347. 



§ Ann. & Mag. Nat. Hist. ser. 3, vol. xv. 1865, p. 406. 



I Monogr. Oarb. Biv. Entom., Pal. Soc. 1874, pp. 32, 38, 40. 



