75 



A VIC. 



■5A AVICULOPECTer* OCCIDENTAUS. 



5 AVICULOPECTEN OCCrOENTAUS. 



Aviculopecten occidentalis. (Shumard, in Swallow's 



Missouri Rt. of 

 J(lll...ssg^^^s^ 3, ^ 1855, page 207, 



plate 0, fig. 

 18.) Collett's 

 Indiana Rt. of 

 1883,pagel43, 

 plate 28, fig. 3, 

 outside view 

 of left valve, 

 natural size. XIII-XY. One of the 

 commonest shells of the Upper and 

 Lower Coal Measures, from Indiana 

 westward ; has been found in Utah and 

 Arizona ; ranges up into the Permian 

 (Meek.) Note.— It is not the Che- 

 mung shell to which Winchell applied 

 the same name in 1863, Proc. Acad. N. 

 S.Philadelphia. (S.A.Miller.) Found 

 by Heilprin in Coll. Wyoming Hist. 

 Soc. Wilkes-Barre, Pa. For western Pa. see Appendix. 



Aviculopecten orhiculatus. See Lyrispeeten orb. VIII c, 

 Aviculopecten pecteniformis. {Avicula pecteniformis.) 



Hall, page 262, fig. 

 117, 1, 2." (Conrad, 

 1842, Journal Acad- 

 emy Nat. Sciences, 

 Philadelphia, Vol. 

 VIII, PI. — , fig. 



.) VIIIgGYie- 



mung for m a t i o n . 

 ( Villa Upper Hel- 

 derberg, Vlllh. and 

 Marcellus forma- 

 tions. Miller.) Lower 

 valve abundant in 

 Western New York. 

 (Hall.) See sect, 

 at Corning quoted 

 in Rt. I, p. 93. Col- 



