WHiTEAVEsJ FOSSILS OF HAMILTON FORMATION OP ONTARIO. 381 



Same formation and locality as for the preceding species. Hall. 



In the eighth volume of the official reports of the Geological Survey of 

 Illinois, published in 1890, Mr. Ulrich maintains t\\a.t Lichenalia, Hall, is 

 synonymous with Fistulipora. If this be the case, it of course follows that 

 this and the two following species should be referred to Fistulipora. On the 

 other hand, Mr. G. B. Simpson, in his " Handbook of the Genera of the 

 North American Paheozoic Bryozoa," published in 1897, claims that the 

 interapettural surface is invariably cellulose in Fistulipora and solid in 

 Lichenalia. 



Lichenalia subtrigona. Hall. 



Lichenalia suUrigon-a,'H.a.\\. 1887. Pal. N. York, vol. VI., p. 196. Not figured. 

 Hamilton group, West Williams, Ontario. Hall. 



Lichenalia ramosa, Hall. 



Lichenalia ramosa. Hall. 1887. Pal. N. York, vol. VI., p. 199. 

 "Hamilton group, West Williams, Ontario.'' Hall. 



Pinacotrypa elegans, Rominger. (Sp.) 



Fistulijmra elcgans, V-'mmgeT. 1866. Proe. Ac. Nat. So. Philad., vol. XVIII., p 121, 

 Fistulipora prvporoides, Nicholson. 1879. Struct, and Affin. Tabulate Corals of the 



Palaeozoic Period, p. 310, fi^. 41 (on p. 311) and pi. 15, figs. 



2 and 2 a ; teste Ulrich. 

 Pinacotrypa clepans, Ulrich. 1890. Geol. Surv. Illinois, vol. VIII, p. 385. 



Dr. Uominger's Fistulipora elegans, which Ulrich (op. cit.) makes the 

 type of his genus Pinacotrypa, was based upon specimens from the shore of 

 Lake Erie at Hamburg, N. Y., and from Widder. Two of the specimens 

 from Hamburg have been presented to the Museum of the Survey by Dr. 

 Rominger. According to Professor Nicholson [op. cit.) F. proporoides is 

 common in the Hamilton Group at Canandaigua, in the State of New 

 York. 



Hederella cirehosa, Hall. 



Htclerella cirrhosa. Hall. 1881. Trans. Albany Inst., vol. X., p. 194. 

 1884. Kep. State Geol. for 1883, p. 53. 

 1887. Pal. N. York. vol. VI., p. 277, pi. 65, figs. 12 and 13. 



Thedford, in the " Middle third of the section," C. Sohuchert, 189.5 : six 

 specimens, which have been identified with this species by Mr. Schuchert. 

 They are all adherent to corals, five to as many specimens of Heliopiliyl- 

 lum llalli, and one to a broken corallite of Grepidophyllum Archiaci. 

 All six are No. 26,577 of the United States National Museum Catalogue 

 of Invertebrate Fossils. 



