2 



Thallus unverzweigt, die Fäden + 3 mm. breit. Habituell an die 

 rezente Chorda erinnernd (Fig. 1). 



Fig. 1. Bythotrephis simplex, Kidston (nach Kidston). 



2. BYTHOTREPHIS GRACILIS, Hall (Fig. 2). 



Fucoides gracilis, Hall, Nat. Hist. of New-York, Geology of New-York r 



IV. 1843, p. 69, Fig. 14. 

 Bythotrephis gracilis, Hall, Nat. Hist. of New-York, Palaeontology, I, 



1848, p. 62, Taf. XXI. Fig. 1 ; II. 1852, p. t8, Taf. V, Fig. 1 ; Lesouereux. 



Indiana Dept. of Geol. and Nat. Hist. i3th Annual Report, II. 1884, 



p. 30, Taf. I, Fig. 6, 7 (?Fig. 1); Kidston, Canonbie, 1903, Taf. I, Fig. 3. 

 Id. var. intermedia, Hall, 1. c. 1852, II. p. 19, Taf. V, Fig. 2. 

 Id. var. crassa, Hall, 1. c. 1852, II. p. 19, Taf. V, Fig. 3. 

 Palaeophy cns gracilis, Leso., Coal Flora. 1879, 1. p. 11, (? Taf. B., Fig. 9 — 10). 



