GASTROPODA— -TURR1TELLWM. 



737 

 One or two 



tance below the suture, which is broadly depressed, 

 faint spirals in concave space of adult whorls. 

 Caloosahatchie beds of Florida. 



439. T. apicalis Heilprin. (Fig. 1071, b.) Pliocenic. 

 Shorter and more rapidly tapering than the preceding, with a 



similar cancellated median spiral ; upper carina single. 

 Caloosahatchie beds of Florida. 



CXXII. Vermetus Adams. 

 Young shell like Turritella, adult portion loose and variously 

 twisted ; the young shell gradually disappearing and the aperture 

 becoming round. (The species are mostly terminals of various 

 genetic lines of Turritella.) Eocenic-Recent. 



440. V. (Petaloconchus) varians d'Orbigny. 



Oligocenic-Recent. 



Irregularly convoluted, forming a loosely glomerated mass with 



longitudinal rugose ridges or costae, or smooth. On the inside of 



tube, two scarcely curved lamellae extend obliquely inward from 



Fig. 1072. #, Vermetus graniferus ; b, part of same enlarged; c, V. virginicus. 

 (After Martin, Md. Survey.) 



the ends of the more flattened side, with often a short one arising 

 between them. 



Oligocenic of Florida. Pliocenic of Carolina (Waccamaw beds) 

 and Florida (Caloosahatchie beds). Post Pliocenic, Florida reefs ; 

 living southwest Florida to Rio Janeiro. 

 441. V. graniferus (Say). (Fig. 1072, a, b.) Miocenic. 



Turritelloid portion short, non- coiling portion very much con- 

 torted and vermetoid, in complex clusters ; surface with longi- 

 tudinal, granulose striae ; size varying according to age. 



Chesapeake formation of Maryland, New Jersey, etc. 



