Disc. 



212 



Discinae numerous, with spirifera3, in the Olean (Garland) 

 conglomerate (bottom division of XII) at Dennison's quarry^ 

 S. W. Crawford Oo. ; fine specimens in OarlPs collection (III, 

 p. 55.)— X/7. 



Discina, spec. 3107, (cat. O) in loose piece of gray shaly SS, 

 1| m. N. E. of Sharon, Mercer Co., over 2nd mtn. SS. — X 



Dithyrocaris carbonarius. (Meek & Worthen, Proc. 



XH^^^-^^>,3. Acad. Nat. Sc. Phila , 1869; Illinois Rt., Vol. 5, 

 1873, pi. 32, fig. 1.) Collett's Indiana Rt., 1883, 

 page 178, plate 39, fig.'^3, natural size^ upper 

 view of telson and stylets (tail spikes) by which 

 alone this rare crustacean of the Coal Age is 

 _ known — ,XIII. Original specimen found in coal 

 IticI ISS5. J^ measures at Danville, 111. — Specimen in Ran- 

 dall's Warren collection. Pa., recognized by C. E. Hall, Proc. 

 A. P. Soc, Phil., Jan. 5, 1876 — FZ/7-/X 



Doleropteris. See Cyclopteris elegans. XIII, 



Drepanacanthus -fish spine occurs in the Meadville upper 

 limestone. I. C. White, Q4-, p. 83. — X. See Appendix. 



Dicotyles pennsylvanicus. Leidy. Notice and Desc. of 

 fossils in caves and crevices of the limestone rocks of Penn. in 

 An. Rt. Geol. Sur. Pa., 1887 '8 (published 1889), upper and 

 lower jaws of a young extinct Peccary, (first found in Indiana, 

 Jour. Acad. Nat. Sci., Phil., Vol. 7, 1869, p. 385), from Hart- 

 man's cave (Crystal Hill cave) near Stroudsburg, Monroe Co., 

 Pa. See figure in Appendix. — Glacial^ or early Human age. 



Eatoniamedialis. {Atrypamedialis.) Yanuxem page 120, 



fig. 26, 4. Lower 

 vii. HalUii, c,d. . __^i^.8»^ Helderberg forma- 



at ion. — VI On 

 the Delaware, Dr. 

 Barrett finds it in 

 White's Stormville 

 limestone^ under 

 Stormville conglomerate. (G6, p. 134)— F/.— In Perry Co. 

 Claypole collected it from 3 m. east ol Ickesburg (spec. 187-5, 

 one.) — For the internal structure of Eatoniamedialis^ eminens^ 

 :singularis^ and peculiaris^ see Hall's Pal. N. Y., Vol. 3, 1857, 

 page 435, wood cuts, fig. 1 to 6. — VI 



