GENESIS OF THE ARIETIDA. 
Dy 
Ws 
ssh ZY 
\ 
( 
VY VS} 
\ WKS 
oss” 
Fig. 25, 26. Views from the side and in section of Cal. Newberryi showing incomplete living chamber and 
outlines of whorls. 
Fic. 27. View of suture made up from the last suture in Fig. 28 and the study of others. The abdomen 
is projected, to show depth and narrowness of abdominal lobe. 
26 
development of keel and channels, narrower abdomen in the whorls of the adult, 
and in being, like the species of Central Europe, considerably smaller. The 
largest specimen had just begun to pass into the first senile stage. The internal 
or young whorls have pilx similar to those of the young of Cul. raricostatum and 
Cat. carusense. The sutures are similar to those of the normal species of Central 
Europe, having broader lobes and saddles than is customary in the basin of the 
Northeastern Alps. This agrees with other characteristics, which are essentially 
similar to species from the European province. The second and smaller speci- 
men, which is 80.5 mm. in diameter, has similar but straighter pile. The 
abdomen is broader and more depressed, and the channels better defined, but 
how much: of this is due to pressure cannot be stated. Both specimens have 
been distorted by pressure. The first has been affected in such a way that it is 
easy to restore the normal form, whereas in the second case it is not easy to 
separate the results of pressure from the true characters. 
