TYPE SPECIMENS OF INVERTEBRATE FOSSILS. 655 



41582. Tetradella quadrilirata (Hall and Whitfield). Plesiotypes. 



41583. Black River (Ord.). Minneapolis, Minnesota. 

 Stones River (Ord.). High Bridge, Kentucky. 



Ulrich, Geol. and Nat. Hist. Surv. Minn., Final Rept., Ill, Pt. II, 

 1894, p. 678, pi. 46, figs. 1-8. 



41584. Tetradella quadrilirata simplex (Ulrich). Plesiotype. 



Black River (Ord.). Fountain, Minnesota. 



Ulrich, Geol. and Nat. Hist. Snrv'. Minn., Final Rept., Ill, Ft. II, 

 1894, p. 679, pi. 46, fig. 11. 



41384. Tetradella subquadrans Ulrich. Holotype. 



Trenton (Ord.). Trenton Falls, New York. 



Ulrich, Journ. Cincinnati Soc. Nat. Hist., XIII, 1890, p. 115, text 

 figs. 2a-c. 



4601 1. Tetranota bidorsata (Hall). Plesiotype. 



Trenton (Ord.). Near Cannon Falls, Minnesota. 



Ulrich and Scofield, Geol. and Nat. Hist. Surv. Minn., Final 

 Rept., Ill, Pt. II, 1897, p. 877, pi. 65, figs. 10, 11, 13-18. 



46012. Tetranota bidorsata minor Ulrich and Scofield. Cotypes. 



Black River (Ord.). St. Paul, Minnesota. 



Ulrich and Scofield, Geol. and Nat. Hist. Surv. Minn., Final 

 Rept., Ill, Pt. II, 1897, p. 878. 



46013. Tetranota macra Ulrich and Scofield. Holotype. 



Stones River (Ord.). Minneapolis, Minnesota. 



Ulrich and Scofield, Geol. and Nat. Hist. Surv. Minn., Final 

 Rept., Ill, Pt. II, 1897, p. 878, pi. 65, figs. 1, 2. 



46014. Tetranota obsoleta Ulrich and Scofield. Cotypes. 



46015. Black River (Ord.). Chatfield and Cannon Falls, Minne- 



sota. 



Ulrich and Scofield, Geol. and Nat. Hist. Surv. Minn., Final 

 Rept., Ill, Pt. II, 1897, p. 880, pi. 65, figs. 19-23. 



46016. Tetranota sexcarinata Ulrich and Scofield. Cotypes. 



46017. Stones River (Ord.). Dixon, Illinois; Minneapolis, Min- 



46018. nesota. 



Trenton (Ord.). Wykoff, Minnesota. 



Ulrich and Scofield, Geol. and Nat. Hist. Surv. Minn., Final 

 Rept., Ill, Pt. II, 1897, p. 878, pi. 65, figs. 3-9. 



46019. Tetranota wisconsinensis (Whitfield). Plesiotype. 



Stones River (Ord.). Minneapolis, Minnesota. 



Ulrich and Scofield, Geol. and Nat. Hist. Surv. Minn., Final 

 Rept., Ill, Pt. II, 1897, p. 881, pi. 65, fig. 29. 



43366. Thamniscus divaricans Ulrich. Cotypes. 



Keokuk (Miss.). Kings Mountain, Kentucky. 



Ulrich, Geol. Surv, 111., VIII, 1S90, p. 60S, pi. 62, figs. 6-6c, 



