108 Canadian Record of Science. 



Our present knowledge justifies us in drawing the follow- 

 ing conclusions, which embody those stated by Prof. Donald : 



1st. The fossils determined belong to 24 genera, compris- 

 ing 44 species. Of these 33 are common to New York, 16 

 to Gaspe", and 19 to the Nova Scotia series. 



2nd. Atrypa reticularis, Pentamerus pseudo-galeatus, Ehyn- 

 chonella formosa, Bhynchonella nucleolata, Spirifer concinnus, 

 Spirifer cyclopterus, Strophodonta varistriata and Strophodonta 

 punctulifera, from their abundance, may be called the most 

 characteristic fossils of the deposit. 



3rd. They are closely related to the New York series, 

 and are probably the continuation of the same beds. This 

 is the more striking when we consider the small number 

 that has been collected from St. Helen's Island, and yet 

 many of these are typical New York species. 



4th. From the large number of St. Helen's Island species 

 common to the Gaspe" and Bay des Chaleurs series, and also 

 to the Nova Scotia series, it must be inferred that these are 

 closely related also, and particularly since five of the 

 characteristic species of St. Helen's Island are characteristic 

 also of these formations. 



5th. In Canada no sharp line of demarcation can be drawn 

 between the Lower Helderberg and Oriskany formations, 

 as a number of specimens of Spirifer allied to arenosus, and 

 Orthis hipparionyx have been found in the limestone. 



6th. The species called Tentaculites Helena is different 

 from any published by Dr. Hall as occurring in the Lower 

 Helderberg, and as it has occurred only in loose fragments 

 may possibly be of foreign origin and of Hudson Eiver age. 

 "Tube strong, somewhat rapidly enlarging from apex; 

 varies in length from -^ to -J of an inch ; annulated by sharp 

 elevated rings, extending to the apex, eight to nine in the 

 eighth of an inch. Spaces between the elevated rings from 

 two to three times the width of the rings. These spaces are 

 marked by numerous very fine vertical striae." 



It closely resembles Tentaculites Sterlingensis which is 

 described in Worthen and Meeks' reports on the Hudson 



