A CARBONIFEROUS FAUNA FROM NOWAJA SEMLJA. 145 



For the same reason I have refrained from giving synonymic lists, the references I give 

 being sufficient to show the interpretation adopted in any ambiguous cases, and where 

 no reference is given it is implied that the original specific designation is accepted. 



Class RHIZOPODA. 



Order Foraminifrra. 



These organisms are very abundant and well preserved ; many of them I succeeded 

 in freeing from the matrix, in order to base the determinations on both external and 

 internal characters. 



The Carboniferous Foraminifera of Russia have been so accurately described in the 

 exhaustive monograph of V. von Moller that the task of identifying the Nowaja 

 Semlja forms was a specially easy one ; consequently I have nothing of importance to 

 add to what has been stated by the Russian palaeontologist.* 



Genus Endothyra Phillips. 



Endothyra globula (d'Eichwald). 

 Moller, loc. tit., 1878, p. 98, pi. xiii. figs. 1-4. 



This species is represented by a number of specimens in various stages of growth ; 

 one of the largest measures approximately 15 mm. in diameter and 0"8 mm. in 

 thickness. 



Genus Spirillina Ehrenberg. 



Spirillina 1 sp. indet. 



Two of the slides contain horizontal sections of a non-septate tube coiled on itself in 

 one plane ; as the specimens consist of seven whorls — although they measure only 

 0*5 mm. in diameter — comparison with the species referred to Spirillina by Moller is 

 difficult. 



Likewise I am unable to express an opinion as to their true affinities. In his review 

 of the genus, H. B. Brady t states that SpirilUnse are not known to occur in formations 

 older than those of the Miocene period, while making no reference to Moller's recogni- 

 tion of that genus in Carboniferous strata. 



Genus Cribrostomum Moller. 



I have not sufficient knowledge of Foraminifera to form an independent opinion re- 

 garding the respective claims of d'Orbigny's Bigenerina and of Moller's Cribrostomum. 



* V. ton Moller, "Die spiral-gewundenen Foraminiferen des russischen Kohlenkalks," Mem. Acad. Imp. 

 Sciences de St Pe'tersbourg, 1878 ; and " Die Foraminiferen des russischen Kohlenkalks," ibid., 1879. 

 + Challenger Reports, vol. ix., 1884, p. 629. 



