HUMPHREYS: THE NAME BUTHOTREPHIS GRACILIS 311 
The synonymy of the two species may therefore be given as 
follows: 
Buthotrephis Hallii nom. nov. 
Fucoides gracilis Hall, Nat. Hist. N. Y. Part IV, Rept. Fourth 
Geol. Dist. 69. f. 74. 1843. 
Buthotrephis gracilis Hall, ibid., Part VI, Paleont. N. Y. 2: 
18. pl. 5. f. 1a-1d. 1852. Not B. gracilis Hall, ibid. 1: 62. pl. 
fs $2. 37a 
BUTHOTREPHIS GRACILIS Hall 
Nat. Hist. N. Y. Part VI, Paleont. N. Y.i12 62.91, er. J. 4%, 
1847. 
Buthotrephis tenuis Hall, ibid. 2: 18 [note under synonymy]. 
1852. 
