8 NORTH AMERICAN INDEX FOSSILS. 



Lower Cambric of Newfoundland, Quebec, eastern Massachu- 

 setts, eastern New York, Utah (?) and Nevada (?). 



V. . CoLEOLOiDES Walcott. 



Shell elongate, slender, cylindrical. Differs from Hyolithellns 

 in its spiral longitudinal strise. Cambric. 

 i8. C. typicalis Walcott. (Fig. 1218, ^,/.) Cambric. 



J d 



Fig. 1 218. a, HyoUthellus micans ; 3-^/, opercula of same ; <?, /, Coleoloides typicalis^ 

 with enlargement; g-i, Salterella ptdchella ; j, S. rugosa. (After Walcott. ) 



Apical angle exceedingly acute. Shell apparently very thin. 

 The longitudinal strise make one revolution around the tube in a 

 length of sixteen diameters of the tube. Type of genus. 



Lower Cambric of Conception Bay, Newfoundland. 



VL CoLEOLus Hall. 



Shell very elongate conical, straight or slightly curved, thick- 

 walled. External surface marked with engirdling strise, more or 

 less oblique to the axis of the shell. Devonic. 



