112 GEOLOGICAL MEMOIRS. 



true passage*. Three of the Goniatites from Cossatchi Datchi, be- 

 sides G. JosscB from Artinsk, are proved by the number of their 

 lobes to belong to the group of which G.Listeri may be considered as 

 the type, and which are distinguished from G, striatus, G. sphcBricus 

 and G.crenistria by the rounded form of the dorsal and lateral sadr\ 

 dies. The G.cyclolohus, already known in England, presents a cha-? 

 racter altogether exceptional in the deep channeling of the medio* 

 dorsal saddle. 



The Goniatites of the Russian carboniferous rocks, like most 

 species of the same period, have the dorsal lobe divided by an ac- 

 cessory saddle more or less elevated f. When this saddle is equally 

 prominent with the dorsal saddle, it is called by the same name, and 

 there might thus be established a true passage between Goniatites 

 in which the dorsal lobe is divided and those in which it is simple. 

 Several of the Devonian species which we obtained from the river 

 Uchta in the chain of the Timan Mountains are of this kind, but 

 others, on the contrary, have the accessory or medio-dorsal saddle 

 buried as it were between more prominent saddles on the right and 

 left ; and these, instead of being true dorsals, as in the carboniferous 

 species, are thrown upon the sides, as, for instance, is seen in G, in- 

 tumescens and G. carinatus of Bey rich, where they may be considered 

 as lateral saddles. Of eighteen species of Goniatites which we have 

 obtained from Russia, eight belong to the bituminous schists (Do- 

 manik-schists) of the river Uchta ; and of these eight, four are new, 

 and four identical with species from the Fichtelgebirge, the Hartz, 

 Brilon in Westphalia, and Oberscheld in Nassau. The carbonife- 

 rous system affords nine species, two of which, G. diadema and G. 

 cyclolobus, occur in England and Belgium, while the others are new. 

 M. Pusch has mentioned three species from Kielce in Poland. 



Annelides. — The remains of animals referred to this class would 

 hardly deserve mention, were it not for the abundance with which 

 one species (^Serpula omphalotes) is distributed almost throughout 

 Russia in the Devonian rocks, and the fact that this species, exclu- 

 sively confined to the beds of the Devonian period, is important in 

 distinguishing those beds from the lower ones. This species is not 

 only found in Livonia and in the governments of Novogorod and 

 St. Petersburg, but also in those of Orel and Voroneje, and it ex- 

 tends as far as to the eastern districts of the government of Vologda 

 and towards the mountains of the Timan range, where the Devonian 

 deposits have undergone no change. It accompanies in many cases 

 the remains of fishes, and disappears, as they do, in the Ural, where 

 the Devonian system puts on a peculiar character. 



Crustaceans. — In the older palaeozoic deposits the Trilohites are 



* However striking the subdivision of the lobes may seem in the case of these 

 Artinsk Goniatites, these species are not less distinct from Ceratites by their me- 

 dio-dorsal saddle channeled at the summit than they are from the Ammonites by 

 their lateral saddles always simple and not channeled. 



t Amongst all the carboniferous species found in Europe, we are only aware of 

 G. Henslowi, G. evolutus, G. serpentinus and G. Belvalianus which have the dorsal 

 lobe simple. 



