194 NEW YORK STATE MUSEUM 



the umbilicus. The whorls are narrow but deep, abruptly curved 

 on the periphery ; the stoma expanded but not explanate. The sur- 

 face is marked by regular simple and continuous elevated revolv- 



Euphemus ? quebecensis 



ing lines which become crowded toward the aperture. There is 

 no evidence of a slit band. The shell has a diameter of lo mm. 



This species represents a very unusual type of structure for a 

 Devonic bellerophontid but is provisionally placed in this associa- 

 tion. 



Middle Devonic. Gaspe Basin, Gaspe. 



Bellerophon (Plectonotus?) gaspensis nov. 



Shell rotuloid, rapidly expanding; expanded but not explanate 

 at the aperture. Outer surface trilobed by two revolving lateral 

 furrows which start early and become wider and deeper with age. 

 These do not divide the surface equally but the lateral divisions 



Bellerophon (Plectonotus) gaspensis 



are considerably narrower than the median division which is broad, 

 prominent and elevated but flattened on top and may have had a 

 peripheral seam. The specimen measures 12 mm in diameter and 

 has about the same apertural width. 

 Lower Devonic. Grande Greve, P. Q. 



Probolaeum ? canadense nov. 



We are disposed to regard as a representative of the Polyplaco- 

 phora or chitons an elongated semicone-shaped plate sinuate on its 

 front margin, with a posterior terminal beak and broadly infolded 

 posterior margin. The characters of this plate are shown in the 



