2/2 NEW YORK STATE MUSEUM 



it last long. The typical S. (Orthis) interstriatus 

 Phillips is shown by Davidson^ to carry at times the umbonal 

 crenulations and the large and fine S. n o b i 1 i s McCoy^ exempli- 

 fies both characters in very simple expression, both of these species 

 being recognized as of Middle Devonic age. The former species 

 is commonly regarded as present in the Eifelian. 

 Lower Devonic. Dalhousie, N. B. 



Stropheodonta rosier! nov. 



This is a small shell characterized by its simple, relatively coarse 

 and highly angular plications which increase by implantation start- 

 ing with 8 to 10 at the beak and becoming twice that number at 

 the margin. Over these and in the intervals are fine radiating 



Stropheodonta rosieri 



surface lines. The 'umbonal region is crenulated by undulating 

 concentric lines which may sometimes extend over the whole sur- 

 face. The shells have thus some of the characters of S. pater- 

 soni precedens of the Grande Greve limestones and of those 

 known in the New York rocks as S. varistriata, but the 

 divergence from either is apparently fixed. 



Lower Devonic. St. Alban beds, Cape Rosier Cove, P. Q. 



Stropheodonta crebristriata Conrad (Hall) 

 protype simplex nov. 



5^^ Hall. Palaeontology of New York. 1867. 4:86, pi. 11, fig. 12, 13, 

 18-21 



On comparing with the hypotypes of this species illustrated in 

 the work cited, a few shells from Grande Greve, we observe that 



1 Monogr. Brach. 85, pi. 18, fig. 15-18. 



2 idem. p. 86, pi. 18, fig. 19-21. 



