No. 406.] REVIEWS OF RECENT LITERATURE. 831 
The New York fauna also shows a difference in the earlier appear- 
ance of Clymenia, which had not yet reached European waters. 
Genuine Prolecanites occur in the Timan beds, but appeared 
later in America, in the Chemung, and became common first in the 
Kinderhook. An important note in Dr. Holzapfel's paper is that 
Karpinsky's genus Ibergiceras (Gon. Tetragonus Roemer), which 
has been supposed to be the radicle of the Prolecanitidz, is merely 
the young of Pronorites cyclolobus and came from the Carboniferous 
limestone of Iberg, not from the Intumescens beds, as has been 
thought heretofore. LP 
Russian Carboniferous Cephalopods. — In this paper the author’ 
has given another important contribution to our knowledge of the 
cephalopod faunas of the Russian Carboniferous limestone. What 
is most interesting to American stratigraphers is that in this small 
collection are recognized a number of characteristic American spe- 
cies, most of which belong to the St. Louis-Chester horizon. This 
strengthens the probability that the lower part of the Moscow lime- 
stone belongs to the Lower Carboniferous and is the equivalent of 
the Visé formation of western Europe. 
It should be noted, however, that the range of these species seems 
to be different from that in America. Thus Nautilus chesterensis 
Meek and Worthen in America is confined to the St. Louis-Chester 
horizon, and in Russia ranges up into the Coal Measures. The 
same thing is true of Zemmocheilus spectabilis Meek and Worthen. 
Brancoceras rotatorium, as described by Tzwetaew, is correct gener- 
ically, but the species is more robust than B. rofatorium or B. ixion, 
its American equivalent. Also in western Europe and in America 
this type occurs only in the Tournaisian, or Kinderhook, which gives 
additional weight to the improbability of specific identity. i 
1 Tzwetaew, Marie. Nautiloidea et Ammonoidea du calcaire carbonifère, Mém. 
Comité Géol. (Russie), T. viii (1898), No. 4. 
