\ 



15 



^oceras, sp. 



Two species of this gjenus occur in the East River collections. 

 One is not distingutshable from the C. subrectum of Hall (L. 

 Held.) The second is flattened laterally, distinctly bent, the 

 septa one-third centim. distant, in a specimen one centim. in 

 diameter. 



Cornulitcs. 



Shells of this species are very abundant in the East River 

 beds. Hall referred the Aris;ii<,' spociiuens to his species C. 

 jiexHoms ; but from their more slender form nanuMl them variety 

 gracilis. At the E.ist River the majority of the specimens are 

 of the Arisaij:; type, but some more robust. There are however 

 others more slender than any f iitul at Arisaij;. Specimens 1.3 

 centimetre in length are only 1 millimetre in breadth at the 

 large end, so that from their slenderness they might be mistaken 

 for TentucHlitf'S, though the annulations are those of Conuilites, 

 But for the apparent connecting forms, these slender specimens 

 might be regarded as types of a distinct species. 



Trtlohitcs. 



There appear to occur at the Slast River no less than three 

 species of IIoiiKtlonotus. The most common is II Dnwsovi, Hall, 

 and the others are known to me only by fragments. One has 

 much more numerous annulations on the pygidium than that 

 above named, the other has a nearly smootii pygidium, with about 

 twelve very flat annulations on tlie axis, and resembling that of 

 //. vanuxnnii, Hall, from the Lower Helderberg. The East 

 River collections also add an AcidiLspis to the Upper Silurian 

 fauna of Nova Scotia ; but the single speeimen found is unfor- 

 tunately too imperfect for description. 



Note. — For information as to the economic geologv of this district, 

 I may refer to •'Acadian Geology," and to a valualilo Ileport on the 

 •' ]\rines and IMineral Lands of Nova Scotia,'' by E. Gilpin, A.M., F.G.S. 

 (Halifax, 1880.) 



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