Pholad. 



636 



face, showing well-defined prominence in upper basal surface ; 

 c, lower basal surface ; d^ profile section. Waterloo, Iowa, 

 Middle Devonian^ magnesian beds over the Coralline lime- 

 stone. — VIII. 



Pholadella parallela, Hall. ( Qrammysia parallela, Hall, 



P.M. w l^'^^)- Pal. N. Y.,Vol. 



Pi WXXVIIJ ^' P^^^ ^' ^^^^' P^g^ 



' 470, plate 78, fig. 22, 23, 

 24. Hamilton at Fabius, 

 and Sken. Lake, N, Y. 

 — Recognized by Prof. 

 Hall (Nov., 1888) in 

 Spec. 808-15 (00, p. 

 235) in Fellows' collections at Dingman's Falls, Pike Co., Pa., 

 from Hamilton, — See Olaypole's Perry Co. spec. 12406 (99-34) 

 in company with a Phacops rana^ from Hamilton upper shale^ 



VIII G, 



Pholas Candida, mentioned by Lesquereux as one of the 

 shells found in the sand layers between the modern peat beds 

 of the European coasts, to illustrate his report on the origin of 

 coal beds in Annual report of 1885, p. 117. — Recent, 



Pholidops arenaria. Hall, Pal. N. Y. Vol. 4, 1867, p. 413, 



vnl. Vnl c. 3-H---K^/(? P^- ^- fis- ^9 (iiot 1^? which is a 

 '3. / ^ ^%^ figure of Pho, ohlata, of the Scho- 

 harie Grit, from which Pho. are- 

 naria diflers in being rounder, 

 with a larger muscular impression. 

 P^ ^ Hall.) Oriskany, VII.— Doubt- 

 fully identified by G. B. S. in spec. 803-17 of C. E. Hall's 

 Orbisonia collections, Huntingdon Co., Pa., in Hamilton shale, 



VIII G. 



Pholidops cinclnnatiensis, Hall, pamphlet 1872— Pal. 

 '// !:. , Ohio, Vol. 1, 187^^ p. 130, pi. 5, fig. a, maqniiied 



about three times,, view from above; d it f o^ ])ro- 

 file ; smaller valve unknown : closely allied to 

 Pai. -""' - 1(?A. the P, ovatus of the Upper Silurian shaly lime- 

 stone (VI), which has twelve scaly lines of growth and this 

 only seven or eight, which would not make a diff'erent species 

 of it but for the different geological horizon. [In my opinion 



