TYPE SPECIMENS OF INVERTEBRATE FOSSILS. 511 



411. Placenticeras ( Sphenodiscus) lenticulare (Owen). 



Plesiotypes. 

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



Meek, Rept. U. S. Geol. Surv. Terr., IX, 1876, p. 473, pi. 34, fig. 

 ia, and text fig. 66. 



388. Placenticeras placenta (DeKay). Plesiotypes. 



3680. Fort Pierre (Cret.). Cheyenne River, South Dakota, and 



North Red River, Minnesota. 



Meek, Rept. U. S. Geol. Surv. Terr., IX, 1876, pp. 465-468, fig. 65 

 in text, and pi. 24, figs. 2a, 2b. 



22939. Placenticeras placenta (DeKay)? Plesiotypes. 



Colorado (Cret.) Upper Kanab Valley, Utah. 



Stanton, Bull. No. 106, U. S. Geol. Surv., 1893, p. 169, pi. 39, figs. 



i-3- 

 Fig. 1 = Placenticeras pseudoplacenta. 

 Figs. 2, 3 = Placenticeras stantoni. 



369. Placenticeras placenta intercalare Meek and Hayden. 



Holotype. 

 Fort Pierre (Cret.). Cheyenne River at mouth of Sage 

 Creek, South Dakota. 



Meek, Rept. U. S. Geol. Surv. Terr., IX, 1876, p. 468, pi. 23, 

 figs. ia-c. 



See Ammonites placenta intercalaris. 



21651. Placenticeras planum Hyatt. Cotypes. 



29410. San Carlos (Upper Cret.). San Carlos, Presidio County, 



Texas; Presidio del Norte, Mexico. 



Hyatt, Mon. XLIV, U. S. Geol. Surv., 1903, p. 202, pi. 33, figs. 

 2-4; pi- 34. figs. 1-3. 



22344. Placenticeras pseudoplacenta Hyatt. Cotype. 



Colorado (Upper Cret.). Upper Kanab Valley, Utah. 



Hyatt, Mon. XLIV, U. S. Geol. Surv., 1903, pp. 216, 217, pi. 43, 



figs. 3- 10 - 

 See Placenticeras placenta? 



22199. Placenticeras pseudoplacenta Hyatt. Cotype. 



Fort Benton (Upper Cret.). Muddy Creek, Huerfano 

 County, Colorado. 



Hyatt, Mon. XLIV, U. S. Geol. Surv., 1903, pp. 216, 217, pi. 43, 

 fig. 11. 



2941 1. Placenticeras sancarlosense Hyatt. Cotypes. 



San Carlos (Upper Cret.). San Carlos, Presidio County, 

 Texas. 



Hyatt, Mon. XLIV, U. S. Geol. Surv., 1903, p. 200, pi. 30, figs. 

 1-3, pi. 31, figs. 1, 2. 



22939. Placenticeras stantoni Hyatt. Holotype. 



Colorado (Upper Cret.). Upper Kanab Valley, Utah. 

 Hyatt, Mon. XLIV, U. S. Geol. Surv., 1903, p. 214. 

 See Placenticeras placenta? 



