DENDROID GRAPTOLITES OF HAMILTON, ONTARIO. 55 



INOCAULIS VEGETABILIS Gurley, new species. 



Plate 5, figure 1. 



Gurley describes this species as follows : 



A specimen in the New York State collection has the mode of growth charac- 

 terizing /. phycoides, but is very much stouter in every way, the thiclcness of 

 the stem and main branches reaching 6 or even 7 mm. and the terminal branches 

 measuring 3 and 4 mm. Still it if not absolutely impossible that the difference 

 may be merely one of age or distance from the point of origin of the polypary, 

 but there is at present nothing to show that this is the case. 



The substance is in this case iireserved in places, and forms a thick, coal- 

 black film with longitudinal striations and furrowing corresponding to fibers 

 and bands. No theca* are visible. 



Horizon and locality. — Niagaran (Lockport), Hamilton, Ontario. 

 Holotype. — New York State collection. 



INOCAULIS ? THALLOSUS Gurley. new species. 



I'late 2, figui'e 5. 



Gurley describes this species as follows: 



Polypary 15 mm. long and 9 mm. in extreme breadth, consisting of a main 

 stem about 1 mm. thick, from which proceed laterally at a little less than a right 

 angle, branches about 0.0 mm. wide and about 5 mm. or less long. The 

 branches bifurcate about 1.5 mm. from the stem, and farther on redivide. 



Only a single specimen (obverse and reverse) of this species was seen. 

 The species simply show as a stain (but a well-outlined stain) on the rock, 

 with little or no evidence of graptolite structure. It is therefore possible that 

 this species does not belong to the graptolites, but at any rate it seems to be 

 new and is a part of the fauna. 



Horizon and locality. — Niagara limestone at base of chert, Hamil- 

 ton, Ontario. 



Holotype. — Cat. No. 55316, U.S.N.M. The reverse is in the Spencer 

 collection. 



Genus ACANTHOGRAPTUS Spencer. 



Acarithngrnpsiis Spencer. Canadian Nat., VIII, 1878, p. 461. 

 Acanthograptus Lapworth. Quart. Journ. Geol. Soc. London, XXXYII, 



1881, p. 174.— Spencer. Trans. Acad. Sci. St. Louis, IV, 1884, pp. 562. 



581: Bull. Mus. Univ. State Missouri, I, 1884. p. 31.— Miller, North 



Amer. Geol. and Pal.. 1889, p. 170. — Ruedemann, New York State Mus., 



Mem. 11, 1908, p. 191. 



The original description is as follows: 



Frond shrublike, consisting of thick branches, principally rising from near 



the base, with little divergence and some bifurcations. One side of the 



branches is furnished with prominent spines or dentacles, which appear to 



mark the cell-apertnres. Texture corneous and indistinctly striated. This 



82651— Bull. 65—09 5 



