GASTROPODA— TURRITELLID2E. 



733 



Fig. 1065. Turritella 

 humerosa, X %• (Md. 

 Survey. ) 



Fig. 1066. Turritella 

 tampce. 



Fig. 1067. Turritella 

 gatunensis. 



431. T. indenta Conrad. (Fig. 1068, b, c.) 



Oligocenic and Miocenic. 



With very deep sutures in older whorls owing to abrupt lower 

 and upper angulations of whorls, and slight, loose coiling ; young 

 whorls in contact. Sides concave, faintly spiraled. 



Chipolan beds of Chipola River, Florida, and Chesapeake beds 

 of Maryland. 



432. T. aequistriata Conrad. (Fig. 1068, a.) Miocenic. 

 Small, whorls embracing nearly up to the angulation, above 



which they are almost flat, except for a second faint angulation or 

 strong spiral some distance below the suture, and very fine spirals. 

 Aperture longer than wide. 



Shiloh marls of New Jersey, Chesapeakean (Calvert) of 

 Maryland. 



