Orthis. 



514 



Orthis elegantula, {^elegans) Dalman. (K. V. AK. 



Hall 3i Handl. 1827 ; see 

 Sil. Res. 630, 13, 

 f. 12 a,) Figures 

 from CoUett'S In- 

 diana Rt. 1881, p. 

 285, p]. 21, figs. 

 11, 12, ventral 

 and dorsal valves of a small specimen; 13, ven- 

 tral ; 14, lateral ; 15, interior of a large specimen, 

 showing the hinge area, teeth and wide hole (for- 

 amen) ; 16, enlarged twice^ dorsal interior, showing muscular 

 scars, cardinal and crural scars, cardinal and crural processes, 

 and external cardinal (hinge) area; 17, hinge view of 14. — 

 Orthis canalis, Hall, Geol. 4th Dist. N. Y., 1843, p. 105, fig. 36, 

 6.— Rogers, Geol. Pa. 1858, p. 823, fig. 635.— iVm^c^m Zme^T^^ne, 

 Vh ; but in Pennsylvania Clinton shale^ Va. — Cat. 00, p. 

 233, spec. 501-12 (dorsal cast), 501-30 (two); 501-41, 47; 

 502-1, 502-2 (with Homalonotus delph.)\ 502-12, 23; 502-29 a 

 (impressions); 502-42; 505-37 (four) all from Mifflin Co. 

 Clinton ore led roof shales, — In Huntingdon Co. in the 133' 

 shales (in the limestone layers) over Orbisonia ore bed. T3, 

 p. 141. — In Bedford Co. in the shales parting the ore bed at 

 V(X? ..^;320^- Wolfsburg. T2, p. 144.— 00, Hall & Hale's 

 spec. 502-23, from the shales over the ore, — 

 Geology of Canada, 1863, p. 312, fig. 320. In 

 Logan's chapter on the West Canadian Medina 

 >a7 and Clinton formations, Vaf 



Orthis (?) ella, Hall, 13th Annual Report, 1860, p. 121 ; 

 /// i . 6^ 7 ^ 15th An. Rt. 1862, pi. 2, fig. 6, 



7, 8, showing the extremes of 



variation in number of plica- 



^ tions, etc. ''The species is 



'/if^z ;p7;i not an Orthis^ but possesses 



(yeo 



15 tk. 



