i68 The American Geologist. ^^^'^h' ^'-^^s- 
Tcllinomynf cquilatcra Hall, Nat. Hist. N. Y., Pal, H, 1852, p. 330, 
pi. 75, figs. I a- id. 
This may be a Cycloconcha or Ctenodonta. 
Aviciila siihrecta Hall, Nat. Hist. N. Y., Pal., H, 1852, p. 331, pi. 75, 
fig. 3- 
Looks more like an Ambonychia than A^'icttla. 
Avicula securiformis Hall, Nat. Hist. N. Y.. Pal., H, 1852, p. 331, 
pi. 75, figs. 4, 5a, 5b. 
This is not the shell of the same name again described as new by 
Hall in Nat. Hist. N. Y., Pal., HI, p. 290, pi. 53, figs. 11-14. The 
Helderbergian species is now referred to Aviculopecten. 
Avicula limmformis Hall, Nat. Hist. N. Y., Pal, H, 1852, p. 332, pi. 
75, figs. 6a, 6b. 
Illionia sinuata (Hall). 
Anatina? smuaia Hall, Nat. Hist. N. Y., Pal., HI, 1859, 1861, p. 265, 
pi. 49, figs. 3a-3d. 
Hall states that his material came from the "base of the 
Lower Helderberg group, Winfield, Herkimer county." The 
writer found this shell in great abundance in the Cobleskill near 
the same place on Wheelock's farnn, Litchfield, and this seems 
to be the only horizon for this species. The specimens are al- 
ways found transverse to the bedding and standing on the pos- 
terior margin, indicating that Illionia is probably a burrowing 
bivalve. It will probably also be found at Schoharie. 
Plciirotoinaria suhdeprcssa Hall, Nat. Hist. N. Y., Pal., II, 1852, p. 
333. pl- 76, figs. 2a, 2b. 
May belong to Oriostoma. 
Miirchisonia? ohtusa Hall, Ibidem, p. :},2>3y P^- 76.- fe 3- 
Murcliisoniaf terebralis Hall, Ibidem, p. 334. pi. 76, fig. 4. 
Bellerophon aiirictilatns Hall, Ibidem, p. 334, pi. 76, fig. 7. 
Bncania sp.. Hall, Ibidem, p. 334, pi. 76, fig. 6. 
This species appears to be very closely related to B. profunda of 
the Coeymans. 
Trochoceras gebhardi Hall, Nat. Hist. N. Y., Pal., II, 1852, p. 335, pi. 
77, fig. 2; pi. 77A, figs. la-id. — Grabau, Bull. Geol. Soc. Amer., 
XI, 1900, p. 371, pi. 21, figs. 3a-3b. 
Trochoceras turbinafa Hall, Nat. Hist. N. Y., Pal., II, 1852, p. 336, 
pi. 77, fig- I- 
Oncoceras expansum Hall, Ibidem, p. 337, pi. 77 A, figs. 2a, 2b. 
Looks like a fragment of a Phragmoceras. 
Calymene camerata Hall, Ibidem, p. 337, pi. 78, figs. la-if. 
Entire specimens of this species occur in the Manlius of Maryland. 
It is also found in Pennsylvania. 
Lichas (Dicranogmus) ptyonuriis Hall and Clarke, Nat. Hist. N. Y., 
Pal. VII, 1888, p. 86, pi. 19B, figs. 19-21. 
