GASTROPODA— HELICID2E—HETER0P0D A. 823 



sometimes carinated ; with broken color lines ; oblique aperture 

 with a sharp lip; suture slightly impressed. 



Loess of Mississippi Valley ; living in eastern North America to 

 Labrador. 



HETEROPODA. 



CCXX. Pelagiella Matthew. 

 Small thin shells, coiled nearly or quite in a single plane of few 

 whorls ; compressed and with wide entire aperture ; probably pelagic 

 like modern Atlanta to which it seems most nearly related. 

 Cambric. 

 705. P. atlantoides Matthew. (Fig. 12 10.) Cambric. 



Fig. 1209. a, b, Pupa arenula ; c, d, 

 Helix leidyi. (After White, U. S. G. S., 

 III.) 



Fig. 1 210. Pelagiella atlanloi 

 des. (After Matthew. ) 



Rapidly enlarging, one side less convex than other, making a 

 slightly asymmetric coil; margin with somewhat constricted rim. 

 Protolenus bed at base of Middle Cambric, New Brunswick. 



