Grabau — Faunas of the Hamilton Group. 



287 



146. LoCULIPORA PERFORATA, Hall. 



1884, Hall, 36th Rep. N.Y. State Mua. Nat. Hist. p. 65. 

 1888, Hall, 41st Rep. N. Y. State Mua. Nat. Hist. pi. 10. 

 This species is represented in the >S'. demissa bed by several fragments of 

 large fronds. 



Genus Fenestella, Lonsdale. 

 147. Fenestella emaciata, Hall, 

 1884, Hall, 36th Rep. N. Y. State Mus. Nat. Hist. p. 68. 

 1888, Hall, 41st Rep. N. Y State Mus. Nat. Hist, pi, 65. 

 This species is represented by fronds and fragments in the S. demissa bed 

 It is the most abundant fenestelloid in these shales. 



148. Fenestella. 



Several other species of Fenestella occur in these shales, as well as species 

 of other genera, but the present state of the literature on these fossils does not 

 admit of their determination, and they are reserved for future study.* 



ANTHOZOA 

 Genus Favosites, Lamarck. 

 149. Favosites Argus, Hall. 

 1876, Hall, Pal. N. Y., Ills. Dev. Foss., pi. 13. 

 A large specimen of this species from Eighteen-mile creek probably came 

 from the Demissa bed. 



150. Favosites Hamiltonue, Hall. 

 1876, Hall, Pal. N. Y, Ills. Dev. Foss., pi. 34. 

 This species is common in the Encrinal limestone where it often occurs 

 in large heads. I have not observed the species outside of this rock. 



Genus Pleurodictyum, Goldfuss. 

 151. Pleurodictyum stylopora, Eaton. 

 1876, Hall, Pal. N. Y., Ill, Dev. Foss., pi. 3. 

 This species is entirely restricted to the three calcareous layers between 

 five and seven feet below the Trilobite beds, (Pleurodictyum layers) where 



•The following have since been determined; from the S. demissa bed: Fenestella planiramosa. Hall; Reteporina 

 triata. Hall; Unitrypa scalaris, Hall; Fistulicella plana. Hall: Paleschara intercella. Hall; P. reticulata. Hall, P 

 amplectens. Hall; Lichenalia stellata. Hall; Ptylodictya pluma. Hall. Some of these, with many other undetermined 

 ones, Streblotrypa Hamiltonensis, Nicholson, occur in the Bryozoa beds, two f _'et below the Trilobite beds. Rliombopora 

 polygona. Hall, was found four feet below the Encrinal limestone. 



