460 BULLETIN 53, UNITED STATES NATIONAL MUSEUM. 



4809. Orthis hipparionyx Hall. Plastotype. 



Oriskany (Lower Dev. )• Albany County, New York. 

 Hall, Nat. Hist. New York, Pal. Ill, 1859, p. 407, pi. 90, fig. 6. 



— Hipparionyx proximus. 



13787. Orthis impressa Hall. Plesiotype. 



Middle Devonian. Eureka District, Nevada. 



Walcott, Mon. VIII, U. S. Geol. Surv., 1884, p. 115, pi. 13, fig. 13. 



— Schizophoria impressa. 



24422. Orthis iowensis Hall? Plesiotypes. 



Base of Upper Devonian. Clear Water River, Mackenzie 

 River Basin, Canada. 



Meek, Trans. Chicago Acad. Sci., I, 1868, p. 90, pi. 12, figs. 2a-h. 



Probably Orthis (Schizophoria) striatula. 

 See Orthis lentiformis? 



17918. Orthis lentiformis Hall? Plesiotype. 



Middle Devonian. Near New Buffalo, Iowa. 



Owen, Rept. Geol. Surv. Wis., Iowa, and Minn., 1852, pi. 3, figs. 

 10, 10a. 



= Young specimen of Orthis (Schizophoria) striatula. 

 See Orthis iowensis? 



17232. Orthis lonensis Walcott. Holotype. 



Upper Pogonip (Ord.). Lone Mountain, Nevada. 



Walcott, Mon. VIII, U. S. Geol. Surv., 18S4, p. 74, pi. 1 1, figs. 6, 6a. 

 = Hebertella (?) lonensis. 



5901. Orthis macfarlanei Meek. Cotypes. 



24421. Base of Upper Devonian. Lockhart River and near Fort 



Good Hope, Mackenzie River, Canada. 

 Meek, Trans. Chicago Acad. Sci., I, 186S, p. 88, pi. 12, figs. ia-h. 

 = Schizophoria macfarlanei . 



28152. Orthis ( Dinorthis) meedsi artica Schuchert. Cotypes. 



Trenton (Ord.). Head of Frobisher Bay, Baffin Land. 



Schuchert, Proc. U. S. Nat. Mus., XXII, 1900, p. 157, pi. 12, 

 figs. 7, 8. 



674. Orthis michelini nevadensis Meek. Cotypes. 



15202. Upper Carboniferous. White Pine County, Nevada. 



Meek, Rept. U. S. Geol. Expl. 40th Par., IV, Pt. I, 1S77, p. 63, 

 pi. 17, figs. i-ic. 



= Rhipidomella nevadensis. 



4882. Orthis musculosa Hall. Plastotype. 



Oriskanv (Lower Dev.). Coeymaus, Albanv Countv, 

 New York. 

 Hall, Nat. Hist. X. V., Pal. Ill, 1S59, p. 409, pi. 91, figs. 3a, 3b. 

 = Rhipidomella musculosa. 



