SOME NEW DEVONIC FOSSILS 275 



tiounced. These are characters of L. m a g n i f i c a not of 

 L. perplana. Concentric wrinkles on the shell are altogether 

 absent. 



2 The cardinal area is denticulate to its extremities though nar- 

 row and but slightly cross striated; the delthyrium is open. 



3 The muscle scars are not greatly divergent but, as in L. m a g - 

 n i f i c a , are contracted at the beginning though they extend 

 more than halfway across the shell. 



The shell is essentially a diminutive expression of that species, 

 its fundamental structure being quite in harmony with it and its 



y 



Leptostrophia magnifica protype p a r v a 



lesser variety t a r d i f i from the Perce rock. In our material 

 an occasional specimen indicates the presence of individuals larger 

 than these we have figured. Dr Drevermann, after examination 

 of these specimens, finds this shell closely approaching L. e x - 

 p 1 a n a t a Sowerby of the Coblentzian though that shell attains 

 more nearly the dimensions of L. magnifica and has flatter 

 rather than threadlike striae on the surface. 



Lower Devonic. Edmunds Hill, Chapman Plantation, Me. 



Strophonella (Amphistrophia) continens nov. 



Strophomena punctulifera Conrad, var. Billings. Palaeoz. 

 Foss. 1S74. V. 2, pt I, p. 32 



Shell rather strongly concavo-convex, the normal convexity of 

 the ventral valve being continued for about one third the length 

 of the shell. The reversal is gradual but becomes abrupt specially 



