Pleu. 722 



Pleurotamias of undetermined species are reported from 

 various formations and localities in Penn8ylvania,.besides the 

 quotations made under the forgoing specific names, to some of 

 which, however, the specimens collected will, on further study, 

 very probably, be found to belong. Thus — 



In the Calciferous sandstone^ II a, in Centre Co. Prof. 

 Ewing finds numerous specimens, which may be one or more 

 of the four Canadian forms: P. calcifera^ P. gregaria^ P. 

 laurentina^ or P.ramsayi^ (hardly the Wisconsin form P, mu 

 ralis); not to mention others not inserted in this book, such 

 as P. abrupta^ arabella, canadensis^ miser, all Canadian forms 

 namf d by Billings ; or P. turgida, Hall (T3, 367 ; T4. 423). 



In White's Selinsgrove lower limestone^ Northumberland Co. 

 which he accounts the base of the Marcellus^ but which occu- 

 pies the place of the Corniferous, VIII a^ Pleurotorriarias are 

 numerous in a crowd of other shells and polyps. (G7, 79, 360.) 

 Claypole's specimen 223-10 is from the same horizon at Cen- 

 tre mills, Madison township. Perry county. 



In the Hamilton middle shales^ in Bedford county, No. 48, 

 of Stevenson's Saxton section, Pleurotomarias abound in com- 

 pany of two jBellerophons, Si Tropidoleptus^smd a large Ghonetes, 

 (T2, 83, 231).— F///C. 



From Hamilton sandstone and upper slates^ is Claypole's 

 specimen 171-3, go»t one mile west of Marysville, Perry county ; 

 and 196-4 (three) got at Rough and Ready, Huntingdon county. 

 — VIIIc. 



From the Chemung rocks in Montebello Narrows, Perry Co., 

 came Claypole's spec. 144-10 (two). — VIII g. 



In White's Chemung- Cat skill passage leds^ VIII-IX, in 

 Columbia county, a formation 1,000 feet thick between the first 

 red bed (2,200' to 2,500' above the top of the Hamilton) and 

 the first Catskill -fish hed, a Pleurotomaria occurs with Che- 

 mung forms which survived far up into the Catskill age. (G7, 

 65, 238, bed No. 45 of the Catawissa section.) — Claypole's spec. 

 104-15 (a fragment) from the King smill sandstone. Perry Co., 

 belongs to this horizon. 



From the base of the Catskill, Claypole's Perry Co. speci- 

 mens 93-13,14, were found with fish fragments of HoloptycMus. 



