212 NOVA SCOTIAN GEOLOGY.— HONEYMAK 



Crustacea. 



Calymene blumenbachii. 



Homalonotus dawsoni. 



Dalmania logani. 



Phacops stokesii ? 



Proetus stokesii ? 



Entomostraca. 



Beyrichia. 



Crinoidea. 



Cornulites flexuosus. 



Tentaculites. 

 The greater part of the organisms of D Springville are iden- 

 tical with those of D Arisaig. Still only a very small proportion of 

 the species in the type have yet been found here. The same may 

 be said of C, the other Upper Silurian member of the " Upper 

 Arisaig series." When I make notes on my new map of Antigo- 

 nish County this will be made manifest. It is evident however, 

 even from the Springville series, that the fauna of Nova Scotia 

 silurian had in C and 1) attained their maximum development 

 especially in cephalopoda, pteropoda, heteropoda, gasteropoda > 

 lamellibranchiata, brachiopoda of certain genera, trilobites and 

 crinoids. The exceptions are as follows, viz : Brachiopoda, orthis 

 athyris, spirifer, these have their beginning and climax in A, 

 lingulse in A and B', are rare in B' and very rare in C and D. 

 The trilobite, dalmanites, is characteristic of B', Calymene is in 

 A, C and D. The graptolithus expires in B'. The pteropod, con- 

 ularia is peculiar to B'. Petraia have their beginning, climax 

 and end in A. 



Marine vertebrates do not appear ; all are invertebrates. The 

 cephalopoda are of the highest order, and at the same time car- 

 nivora of the period. 



Carboniferous (f f.) 

 The fauna of the Lower carboniferous limestones succeed the 

 Upper Silurian, in the County of Pictou and elsewhere in Nova 

 Scotia as far as is known. This makes a large break in the suc- 

 cession of life. To fill up the gap the Devonian or Old Red Sand- 

 stone is required, with its fishes, Crustacea,, rnollusca, &c. 



