18() BULLETIN 53, UNITED STATES NATIONAL MUSEUM. 



46149. Ctenodonta retrorsa Ulrich. Holotype. 



Trenton (Ord.). Near Burgin, Kentucky. 



Ulrich, Geol. Surv. Ohio, VII, 1893, p. 679, pi. 50, figs. 14, 15. 



46150. Ctenodonta scofieldi Ulrich. Cotypes. 



4615 1. Black River (Ord.). Six miles south of Cannon Ft lis, 



Minnesota. 

 Trenton (Ord.). Goodhue County, Minnesota. 



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

 1894, p. 539, pl- 42, figs. 53-58. 



46152. Ctenodonta similis (Ulrich). Plesiotypes. 



Richmond (Ord.). Spring Valley, Minnesota. 



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

 1894, p. 604, pl. 42, figs. 102, 104-106. 



See Tellinomya similis. 



46153. Ctenodonta simulatrix Ulrich. Holotype. 



Richmond (Ord.). Spring Valley, Minnesota. 



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

 1894, p. 601, pl. 42, figs. 95-97. 



46154. Ctenodonta socialis Ulrich. Cotypes. 



46155. Black River (Ord. ) . Chatfield and six miles south of Can- 



non Falls, Minnesota. 



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

 1S94, p. 594, pl- 42, figs. 59, 60. 



46156. Ctenodonta subnasuta Ulrich. Holotype. 



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



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

 1894; p. 585, pl. 42, figs. 34-36. 



28163. Ctenodonta subnasuta Ulrich? Plesiotypes. 



Trenton (Ord.). Head of Frobisher Bay, Baffin L,and. 



Schuchert, Proc. U. S. Nat. Mus., XXII, 1900, p. 160, pl. 13, 

 figs. 4-6. 



430. Cucullaea ( Idonearca? ) cordata (Meek and Hayden). 



Holotype and paratypes. 

 Fox Hills (Cret.). Moreau River, South Dakota. 



Meek, Rep. U. S. Geol. Surv. Terr., IX, 1S76, p. 89, pl. 29, figs. 

 6a, 6b. 



See Area (Cucullaea) cordata. 



348. Cucullaea exigua Meek and Hayden. Holotype and paratype. 

 Fort Pierre (Cret.). Mouth of Milk River, Montana. 

 Meek and Hayden, Proc. Acad. Sci. Phila., VIII, 1856, p. 275. 

 = Trigonarca (Breviarca) exigua. 



12546. Cucullaea haguei Meek. Holotype. 



Jurassic. Weber Canyon, Wahsatch Range, Utah. 



Meek, Rept. U. S. Geol. Expl. 40th Par., IV, Pt. I, 1S77, p. 134, 

 pl. 12, figs. i-ib. 



