738 NORTH AMERICAN INDEX FCSSILS. 



442. V. virginicus (Conrad). (Fig. 1072, c.) Miocenic. 

 Differs from the preceding in being less intricately coiled, and 



in the absence of surface sculpture, except lines and wrinkles of 

 growth. 



Chesapeake formation of Maryland, Virginia, etc. 



CXXIII. Laxispira Gabb. 

 Vermetoid shells of subregular, loose coils, forming a corkscrew 

 spire. Cretacic-Tertiary. 



443. L. lumbricalis Gabb. (Fig. 1073, a -) Cretacic. 



Fig. 1073. a, Laxispira lumbricalis (left) ,• b> Siliquaria pauperata (right). (After 



Whitfield. ) 



Loose-coiled spirals, the section of shell nearly circular except 

 in last volution ; surface with fine spirals and lines of growth. 

 Ripleyan of New Jersey and southern states. 



CXXIV. Siliquaria Bruguiere. 

 Like the preceding but with a continuous cleft or row of pores 

 along one side of the entire shell. Cretacic-Recent. 



444. S. pauperata Whitfield. (Fig. 1073, b.) Cretacic. 

 Coil loose, surface apparently smooth, cleft on upper side of 



whorls. 



Ripleyan of New Jersey. 



CXXV. Glauconia Giebel. 

 Turritelloid shells with faintly canaliculated aperture, the outer 

 lip of which has an anterior and a median notch or emargination. 

 Comanchic-Cretacic. 



445. G. (Vicarya) branneri (Hill). (Fig. 1074.) Cretacic. 





