1 82 NEW YORK STATE MUSEUM 



volutions less than two. There is no evidence of spirality in the 

 body whorl beyond the first third of the shell. Section of body whorl 



•^ Lb Jl 



Platvceras leboutillieri 



circular. Shell growth somewhat irregular in late stages but ap- 

 parently without nodes. 



Aperture but slightly undulated. 



Hight from apex to stoma 18 mm. diameter of body whorl near 

 aperture 14 mm. 



Lower De-jonic. Grande Greve and Perce rock. P. Q. 



Platyceras gaspense nov. 



A rather small species with small spiral of one and one half whorls 

 very rapidly expanding so that at the end of the one and one half vo- 

 lutions the shell is of notable width ; thence the whorl becoming free 



Platyceras gaspense 



and suberect suggesting the outline of P. t h e t i s Hall of the Ham 

 ilton shales but with shorter body whorl and larger spire. The 

 final whorl is compressed but appears to have been subelliptical 

 in cross-section. Surface smooth with one or more longitudinal 

 furrows. 



Middle Dcvonic. Gaspe Basin, P. O. 



Platyceras paxillifer nov. 



A small shell closely coiled for two and one half volutions or 

 throughout its length, rapidly expanding and having the general as- 

 pect of a shallow Diaphorostoma or Strophostylus ; the surface 

 roughly corrugated concentrically, the upper shoulder of the shell 

 bearing a single row of slender spines, beginning, in the best pre- 

 served specimens, at the end of the second whorl or the commence- 

 ment of rapid expansion, and three in number at unequal intervals. 

 This species represents one of the large group of spined Platy- 

 cerata so frequent at this period in the development of the genus ; 



