﻿1850.] CATULLO ON THE RED AMMONITIC LIMESTONE. 75 



angulata, A. angusta, and A. dilatata, of which I intend to give the 

 figures on another occasion. At present I exhibit only an outline ot 

 each (see figs. 3 & 4). 



Fig. 3.— Species of Antinomia belonging to the Neocomian 

 Limestone. 



1. Antinomia diphya. 



2. A. deltoidea. 



Fig. 4.— Species of Antinomia belonging to the Upper Epiolitic 

 Limestone. 



3. Antinomia angulata 



angusta. 



5. A. dilatata. 



Recapitulation. — What I have said regarding the distinctions to 

 be established in the epiolitic formations may be recapitulated as 

 follows : — 



1st. The red epiolitic limestones, underlying the cretaceous system 

 of Northern Italy, distinguished by geologists by the general name 

 of red ammonitic limestone, belong to the different formations. The 

 first, or oldest, receives a fine polish, and contains many species of 

 Ammonites which are never found in the limestone that is above it, 

 although a great quantity of remains of fish are found there, which 

 have their counterparts in the beds belonging to the cretaceous sera ; 

 the second, or more recent limestone, is of a schistose structure, is 

 sometimes arenaceous, and contains the remains of fossils, some of 

 which are peculiar to it {Ammonites, Antinomia), and some reappear 

 in the neocomian formation ; thus showing that they were depo- 

 sited in a period intermediate between the chalk and the jurassic 

 system. 



2nd. The species of the genus Antinomia, which we have classified 

 as belonging to all the beds of the neocomian formation (Antinomia 

 diphya and A. deltoidea), never appear in the underlying epiolitic 

 limestones, in which are found instead other species of the same 



