MOLLUSCA—CONULARIDA—TORELLELLID^. g 



19. C. tenuicinctus Hall. (Fig. 1219, &.) Devonic. 

 Shell straight. Interrupted longitudinal striae present. 

 Hamilton of New York and Falls of the Ohio. 



20. C. gracilis Hall. (Fig. 12 19, a.) Devonic. 



Fig. 1219. a, Coleolus gracilis ; b, C. tenuicinctus, X %• 



Shell curved. Surface apparently transversely striate. 

 Hamilton-Chemung of New York. 



VH. Urotheca Matthew. 



Shell a long, chitinous, cylindrical tube. Opening transverse, 

 with no projecting lip. Cambric. 



21. U. perveta Matthew. Cambric. 

 Tube gently curved; faint longitudinal striae present upon the 



exterior. 



Lower Cambric of Newfoundland and eastern Massachusetts. 



Vni. Salterella Billings. 



Small, elongate, conical tubes, straight or slightly curved, and 

 consisting of several hollow cones placed one within another, the 

 last one forming the living chamber. Transverse section circular 

 or subtriangular. Cambric and ( ?) Ordovicic. 



22. S. pulchella Billings. (Fig. 1218,^^'.) Cambric. 

 Shell gently curved, its exterior with small encircling striae just 



visible to the naked eye. 



Lower Cambric of Labrador, Quebec and Vermont 



