Orthis. 



538 



Orthis tri'cenaria, Oonrad, Proc. Acad. Nat. Sci. Phila. 



. --. Vol. 1, 1843, Trenton. Geology of 

 ^'^ Canada, 1863, page 167, fig. 151 ^, J. 

 At Bellefonte, Spec. 210-138 (seven- 

 teen poor specimens), 210-140 (three 

 young individuals.) Little Juniata 

 "^river above Tyrone Forges, 211-8 (in- 

 terior- of dorsal valve). (C. E. Hall, T3, p, 367.) (Ewing, T4, 

 p.424.)— 7/c. 



OrtMs tritonia, Billings. Pal. Foss. Vol. 1, 1872. Geology 



2# of Canada, 1863, page 231, figs. 244 a, 

 exterior of dorsal valve ; 5, interior of 

 the same specimen from the Quebec 

 group II? 



See Orthis resupinata. F///, d. 



Orthis tulliensis. 



Ccm CL^a J 3^t>3 



Orthis unguiculus {Spirifera unguioulus.) See Ambocoe- 

 lia umbonata. — It occurs with many other Chemung shells at 

 bridge over Crowley's run, Erie Co. Q4, p. 283. — VIII g. 



Orthis vanuxemi. Hall, Tenth Reg. Rt. N. Y. 1857. 



yj Geology of Can- 

 ' ada, 1863, page 

 384, figs, 417 a, 

 Z>, c, ventral, 

 side, and dorsal 

 views of a spec- 

 imen from the 



W. Canada Hamilton formation^ VIII g. Spec. 808-2, -24, from 

 Dingman's Falls, Pike Co. Hamilton.^ VIII c. — 869-8, from 

 LeBoeuf quarry, Erie Co., Pa. (00, p. 237) in Third Oil 

 Sand or Panama conglomerate^ Upper Chemung^ VIII g, 

 [Note. — All three were verified specially by J. Hall, Nov. 

 1888.— In Perry Co. at Barnett's Mill (000, spec. 11,759) in 

 Hamilton upper shale, — In Huntingdon Co., numerous in the 

 bottom Hamilton beds (just oyer Marcellus) at Goodman's near 

 Huntingdon (T3, p. 258.) Also in Hamilton lower shales at 

 the Coffee run railroad quarry (T 3, p. 112. — In Columbia Co., 

 Little ^Fishing creek section f G7, p. 75) it has several horizons • 

 one in the Tully limestone ; and two in the Hamilton upper 



