Pajcpozoic Bicalcf'd Kittomostrara. 55 



in the (Carboniferous roeks of Seotland and Ireland ; and may 

 be regarded as L. Okeni, var. inouxata (M'(Jov). 



M. d'Eiclnvald's i\<s;iivc o( ^^ Bain/id Jarifjaia'" aj)])roxinnites 

 to tliat of a Lepcrdttia^ and sliows also the charaeteristic eye- 

 spot. L. microjJit/iah/KCj D'Kiehw., also appears to be relat(^d 

 to L. Okeni as a small variety. 



1**. Leperdkia Okeni^ var. obliqua, nov. PI. VI. fig. 3. 



With the typical L. Okeni from Phillinconowa we find a 

 few specimens of a small Lejyerditia having a relatively short 

 hinge-line, a long slo})ing jwsterior region, and a full ventral 

 curve. This is near L. Okeni, var. acuta {Ann. & Mag. N. 11. 

 ser. 3, vol. xv. p. 406, pi. 20. fig. 4) ; but it has a shorter hinge- 

 line. In outline it approaches both L. Ilisingeri and L. WiL- 

 liensis of Fr. Schmidt *, but agrees with neither. We propose 

 to name this form var. OBLIQUA, as the greatest length is along 



a line much hiirher in front than behind, 

 o 



2. Beyrichia intermedia, Jones & HoU. PI. VI. fig. 11. 



Length ^ inch, height -L inch. A minute, subovate, 

 smooth Beyrichia, with a nearly semicircular ventral border 

 and a deep subeentral sulcus, rather posteriorly placed ; this 

 sulcus cuts the valve vertically, and extends from the dorsal 

 border to less than halfway across the valve ; another, but 

 faint, indentation exists near the smaller (anterior) extremity. 



In soft yellow limestone from near Likhwine, in the Govern- 

 ment of Toula. 



This is undistinguishable from B. intermedia, J. & H.f, from 

 the Upper Silurian rocks of Malvern, except that its slightly 

 greater length gives it a rather more oval outline. 



3. Primitia Eichwaldi, sp. n. PI. VI, fig. 12, a, h. 



Associated with the Leperditia of Phillineonowa we have 

 found some specimens of an Entomostracan corresponding 

 with the description o^ Primitia given in the 'Annals/ ser. 3, 

 1865, vol. xvi. p. 415, except that it has a reticulate and 

 slightly wrinkled ornament. 



It is -ttV iiich long, -^^'^ inch high ; has elongate, oblong, 

 flatly convex valves, with a straight dorsal border, a vertical 

 sulcus in the posterior half, narrow above and bruad below, 



* " Ueber die russischen silurischon Leperditieu," .Mem. Acad. Imp. 

 Sc. St.-P^tersb. 8er. 7, vol. xxi. 1873. 



t Ann. & Mag. N. H. ser. 4, 1869, vol. iii. p. 218, pi. 10. f. 7. 



