Lepa. 



308 



Lepadocrinus gebhardi. ( Lepocrinites gebhardi. ) Van- 

 vf| uxem, page 117, fig. 25, 4. Hall, plate fig. [27, 4.] 

 Lower Helderberg formation. (Stems; one 

 coated with calcite; the other ringed.) — In 

 Perry Co., Pa., collected by Olaypole at Clark's 

 Mills (Spec. S-6). — F/. Vannxem remarks that 

 both figures are of the lower part of the fossil ; 

 one perfect but showing nothing within ; the 

 other showing how the inside is made up of a 

 Vx^^35 .-4. pile of plates or discs. The upper end is drawn 

 in, like the end of a Echinus spine^ and was evidently movable 

 upon the singular fossil of which it was a part. 



Lepadocystites ? VL See Appendix. 



Leperditia alta. {Cytherina alta,) Hall, page 142, fig. 

 58, 6. Yanuxem, page 112, fig. 23, 6. Rogers, 

 page 824, no figure. Lower Helderherg formation. 

 (Conrad, 1843.) — Claypole found it almost the 

 only fossil in Salinared shale ( Fo.) ; very abund- 

 ant in the top layers of the variegated shales, over 

 the Salina red shale ; unusually large and the only abundant 

 fossil form in the Waterlime division of Lower Relderherg. 

 Preface to Keport F2, on Perry Co., Pa. Specimens from 

 Landisburg, Tyrone t. (183-1, four) ; and from near New 

 Bloomfield (X 4) both in Salina. In Lycoming Co., Jersey 

 Shore, H. D. R. reports it ( Cytherina) from Salina^ (Geol. Pa. 

 p^ 536.) — In Pike Co., Pa., in Waterlime (Decker ferry lime- 

 stone, Z. Held, Storm ville limestone) G6, p. 134, 137, very 

 abundant, their seed-like shells covering entire surfaces of 

 Waterlime bed. No. 6 De Witt's section, Monroe Co. (p. 222.)— 

 In the Montour district, throughout Lower Helderherg^ at the 

 quarries (G7, 89, 95, 98, 101, 247, 260.)— Its presence in abund- 

 ance, and absence of corals, distinguish the Waterlime horizon 

 in middle Pa. It and the little Beyrichia seminalis occupy 

 the ground (T, 41.) — In Bedford Co! it marks the Tentaculite 

 limestone of New York (T2, 88, 89) middle of Lower Eelder- 

 lei'g ; and occurs in many of the bottom drab shales and thin 

 bottom limestone layers of Lower Helderlerg (pp. 137, 140, 

 144, 148, 155, 196.)— F/. 



Leperditia argenta. Walcott. Paradoxides zone^ M, C, 

 (Dec, 1888.) 



