46 BULLETIN 65, UNITED STATES NATIONAL MUSEUM. 



Formation and locality. — This perfect little species was found iu the dolomite 

 of the Niagara foruuition proper, near the base of the series, at the quarry just 

 west of the " Jolly-cut " road at Hamilton, Ontario. 



Doctor Riiedemann has recently figured a specimen referred to this 

 species, found in the upper part of the Clinton, at Clinton, X. Y. 

 (See text, fig-. 58.) Except in the matter of size, this example does not 

 diti'er from the original type. 



Genus INOCAULIS Hall. 



InocauUs Hall, Amer. .Tourn. Sci. (2), XI, 1851, p. 401; Nat. Hist. New 

 York, ral., II, 1S52, p. 17G : 20th Kep. New York State Cab. Hi.st., 1868, 

 p. 218 (rev. ed., 1868 [1870], p. 252).— Nicholson, Mou. Brit. Grapto- 

 litidte, 1S72, p. 131. — Spenceu, Trans. Acad. Sci. St. Louis, IV, 1884. 

 pp. 562, 583; Bull. Mus. Univ. State Missouri, I, 1884, p. 33. — Miller, 

 North Amer. Geol. and Pal., 1889, p. 1S)3. — James, Journ. Cincinnati 

 Soc. Nat. Hist., XIV, Pt. 2, 1892, p. 161.— Pocta, Syst. Sil. Centre Bo- 

 hemo, \IU, Pt. 1, 1894, p. 197.— Elles and Wood, Mon. Brit. Grapto- 

 lites, Pal. Soc, 1903, p. xxxiv. — Rikdemann, New York State Mus., 

 Mem. 11, 1908, p. 18-5. 



Hall's original description of this genus is as follows : 



A plantlike, corneous coral, with numerous bifurcating branches; structure 

 fibrous or plumose. 



The texture of this coral is similar to the (;rai»tolites, a black scaly crust or 

 film being all that remains of the substance. From the specimens examined, it 

 appears to have grown iu groups, with rouuded or flattened stems, which are 

 dichotomous above and more or less spreading. The structure is too peculiar 

 to be mistaken or to be referred to any established genus. 



Genotype. — InoeavU.s phimulosus Hall. Niagaran of New York 

 and Canada. 



The characters of both the genus and its type species have been 

 discussed b}^ Doctor Ruedemann in his monograph. 



INOCAULIS PLUMULOSUS HaU. 



" " ? Hall, Pep. Surv. 4th Geol. Dist. New York, 1843, p. 



116, fig. 1. 

 Inocauli,s itlumulosa Hall, Nat. Hist. New York, Pal. II, 1852, p. 176, pi. 



40G, figs. 2a, 2b: (ieol. Surv. Canada, Can. Org. Rem.. Deiade 2. isu.j, p. 



IS, fig. 26; 20th Rep. New York State Cab. Hist., 1868, p. 185. text fig. 



28 (rev. ed., 1868 [1870], p. 215, text fig. 28).— Nicholson, Mon. Brit. 



Graptolitid:e, 1872, p. 132, text fig. 73. 

 InoenuUs plumitJo.sus Spencer, Trans. Acad. Sci. St. Louis, lA', 1884, p. 584, 



pi. 5, fig. 1 ; Bull. Mus. Univ. State Missouri, I, 1884, p. 34, pi. 5, fig. 



1.— Miller, North Amer. Geol. and Pal., 1889, p. 193, text fig. 183.— 



Ruedemann, New York State Mus., Mem. 11, 1908, p. 188, pi. 2, fig. 4; 



pi. 7, figs. 1, 2. 



