SPENCER NIAGARA FOSSILS. 585 



Rochester, and other places in New York, in the Niagara shales ; 

 also at Hamilton, Ontario, in the Niagara limestones, especially 

 in the "chert-beds" at the "Jolly-cut road." 



Inocaulis bellus. 



Hall & Whitfield. Pal. Ohio, vol. ii. 



"Frond small, diflusely branched, originating in a single stipe 

 at the base, and spreading above ; branches narrow and varying 

 much in width, the strongest not exceeding three-hundredths of 

 an inch, with frequent projecting, prong-like processes rising from 

 the sides; bifurcations numerous at varying distances. Substance 

 of frond thin, carbonaceous ; the surface marked with longitudi- 

 nal corrugations, irregularly disposed on most parts and on some 

 of the larger branches, terminating at the upper end in a pustule 

 or free point projecting outwards and upwards from the surface." 



Professors Hall and Whitfield further remark that the corruga- 

 tions on the surface of this species resemble those of some species 

 oi Dictyo7ieina^ though in mode of growth, in the absence of trans- 

 verse filaments, and in other characters, it differs from it. 



Formation and Locality. — Only one specimen of this species was 

 found on the shaly surface of the Niagara limestone at Yellow 

 Springs, Ohio ; nor has it been found at Hamilton, although a 

 closely allied species, /. diffusus (Spencer), has been obtained. 

 This species has also been found near Louisville, Ky. 



Inocaulis divaricatus (Hall). 



(Trans. Alb. Inst., vol. x., 1879; nth Report of Geology of Indiana, 1SS2.) 



"Frond ramose, regularly branching at intervals about ten mil- 

 limetres by dichotomous division. Branches straight ; diameter 

 2 mm., diverging at an angle of nearly 85°, giving the frond a 

 somewhat rigid appearance. Exterior structure composed of nu- 

 merous irregular, longitudinally striated, branching filaments, 

 connected by slender dissepiments, forming rows of small, irregu- 

 lar, subangular cell-apertures." " There is an absence of pro- 

 jecting, imbricating scales forming the cell-margins." (Hall.) 



Fonnation and Locality . — Niagara limestones at Waldron, Ind. 



Inocaulis walkeri, nov. sp. 



Plate 5. Fig. 1. 



Frond strong, with spreading branches, the margins having a 



