SOME NEW DEVONIC FOSSILS 255 



in the Appalachian Devonic ; comparisons therewith are thus need- 

 less. Agreement with the specimens from Hahnenklee and Ram- 

 melsberg in the Hartz is found in the following particulars : 



1 Size. The average in this respect is slightly larger for the 

 adult German specimens. 



2 Outline. The hinge is not extended, and the cardinal angles 

 not produced; less than or equal to 90 degrees. The margins are 

 gently rounded and gradually approximate to the front. The car- 

 dinal area is moderately high and slightly curved making an arched 

 ventral valve. 



3. Plication. The median sinus in each has the width of five 

 to six lateral furrows. The lateral plications are eight to nine on 



Spirifer sub c u s p i da t u s lateincisus 



each side of fold and sinus and they are narrow, round, separated 

 by furrows of similar width. The concentric markings are growth 

 lines which may show a tendency to rugosity near the front. 



4 Fold and sinus. The sinus is moderately deep and angulated. 

 It is more sharply angulated on the Maine specimens ; in some of 

 the German specimens this angulation is apparent only in later 

 growth. The fold is the counterpart of these characters. 



5 Internal characters. Most notable independently and in 

 point of agreement are the very long dental plates, which diverge 

 rather more in the German than in the American form. In the 

 Hartz specimens these plates lie uniformly in the first radial grooves 

 and hence diverge at the angle of divergence of the radii. In the 

 American shells they are quite as uniformly subparallel to each 

 other and thus are not parallel with the radii but transect the prox- 

 imal end of first sulcus and plication. This is a slight but per- 

 sistent difference. The muscle area in both shells is but faintly 

 defined on the ventral valve. 



Lozver Devonic. Presque Isle stream, Chapman Plantation, Me. 



Spirifer cymindis nov. 



This is a shell belonging to an extensive group of early Devonic 

 species which I presume are all minutely fimbriate (as in S. con- 

 c inn us Hall) though not in all have the surface characters been 



