Platyc. 



668 



Platyceras eqvLilsLter'a'ni^ encrusted with Platycrinus hem- 

 isphericus^ which see for figure. 



Platyceras equilaterum, encrusted with Ollacrinus 

 tuherosus^ which see for figure. 



Platyceras erectum (AcrocuUa erecia, Vanuxem). Hall 

 Report on Western District of New York, 1843, page 172, fig. 

 VIU'K^ ^1^' [S^J ^' Upper Helderberg. Recognized 



in specimen 807-12 of Fellows' and Genth's 

 collections, 1875, on Kintner's farm, 1 m. S. 

 W. of Marshall's Falls, Monroe Co., Pa., from 

 Hamilton, VIII c. [So reported by the col- 

 Tr[36]i lectors.l 



Platyceras expansum. See Strophostylus expansus. 

 VI. 



Platyceras formosum, Keyes. American Philosophical 



Society, Phila., Vol. 25, No. 128, 1888, 

 page 142, fig. 9. For a specimen of this 

 shell on which a stone lily had grown, 

 see figure under Dorycrinus. — Subcar- 

 XI 



Keyes A./^'S' ' XKV. 242 

 honiferous limestone. 



Platyceras gebhardi, Oonrad. Annual Report of New 

 York Survey, 1840, lower Helderherg and OrisJcany, — Occurs 

 south of Carpenter's point on the Delaware, in sandy shales 

 which there represent the Orishany, (White's Rt. on Pike 

 Co., G6, p. 123.) Also identified by Dr. Barrett, of Port Jer- 

 vis, among the forms, which crowd the lower Helderherg 

 iStormville) shales. (G6, p. 132).— Fi, VII 



Platyceras hoyti. Walcott, Potsdam Fauna of Saratoga 

 UC, ___ ^ A Co., N. Y., 1888, fig. 4. See Bull. 30, U. 



'^^'^ S. G. S. p. 62.— U. C. Upper Cambrian 

 (Potsdam) Jbrmation, and this species 

 confined to it, but other species of Platy- 

 ceras occur in the Middle Cambrian. — 

 To be looked for in Pennsylvania along 

 the north and west flank of South 

 ises Mountains, and North and South Chester 

 Valley Kill ranges. 



