172 1>R G. W. LEE ON 



Class LAMELLIBRANCHIATA. 

 Genus Pal^eolima Hind. 



Palseolima aff. simplex (Phillips). (PI. II. fig. 45.) 



Hind, Monograph of the British Carboniferous Lamellibranchiata, Pal. Soc, 1903, vol. ii. p. 39, 



pi, xix. tigs. 24-27. 



A right valve measuring 6 mm. dorso-ventrally and about 6 mm. antero-posteriorly 

 is very much like the British form as interpreted by Dr Hind, but its ribs are not 

 appreciably flattened on the anterior side, and in this one respect differs from that form. 



From the Upper Carboniferous Palasolima retifera (Shumard) it differs in having 

 fewer ribs. 



Genus Aviculopecten M'Coy. 



Aviculopecten clathratus (M'Coy). 



Hind, loc. cit., p. 82, pi. xv. figs. 1-7. 



A left valve measuring approximately 8 mm. dorso-ventrally agrees in every respect 

 with Dr Hind's re-description of the species. 



Aviculopecten planoclathratus (M'Coy). 



Hind, loc. cit., p. 91, pi. xv. figs. 8-12. 



The shape and ornamentation of this specimen, which measures 10 mm. dorso-ventrally 

 and 10 mm. antero-posteriorly, are exactly as in the British form, only the radial 

 ornamentation is more accentuated ; but this may be accounted for by the excellent 

 state of preservation of the surface characters in the Nowaja Semlja shell. 



Aviculopecten ? sp. indet. 



A badly preserved pectiniform shell, measuring 30 mm. approximately in its two 

 dimensions, probably belongs to this genus, but not to either of the above species. 



Genus Edmondia de Koninck. 



Cf. Edmondia m'coyi Hind. 

 Hind, loc. cit., vol. i., 1899, p. 329, pi. xxxvi. figs. 23-29. 



A left valve, somewhat obscure and incomplete, belongs probably to a species of the 

 group of Edmondia scalaris (M'Coy), and its affinities to Edmondia m'coyi Hind, are 

 indicated by the shape of the broad concentric ridges, which point to a transversely 

 subquadrate shell rather than to an obliquely suboval one. It measures approximately 

 15 mm. dorso-ventrally and 20 mm. antero-posteriorly. 



