** NEW YORK STATE MUSEUM 



Specimens of this species occur in the white flint nodules at Rochester, 

 and also in the dark dolomite, the latter in a condition altogether similar to 

 that in which they are abundantly found throughout the upper layers of 

 the Lockport dolomite series. The species is also common at the upper 

 Guelph horizon near Shelby falls. In the size of the corallites and shape 

 of the meshes the forms approach that described by Goldfuss as C a t e n i- 

 pora labyrinthica, but the latter is considered by Whitfield ' as a 

 variety of Halysites catenulatus, while Whiteaves regards it as 

 synonymous with the latter, and Lambe asserts that transitions are observ- 

 able to the forms with large corallites and meshes. 



Halysites catenularius, with its varieties has a very wide ver- 

 tical and horizontal distribution and in Canada occurs both in the Guelph 

 and Niagara beds. 



Halysites agglomeratus Hall (sp.) 



Catenipora agglomerata Hall, Geology of New York ; report on fourth dis- 

 trict. 1843. table 22, fig. 2 



Catenipora agglomerata Hall, Paleontology of New York. 1852. 2:129, 

 pi. 35 bis, fig. 2a-g 



Halysites agglomerata Nicholson, Paleontology Prov. of Ontario. 1875. 

 p. 51, fig. 24C, d and p. 66 



Halysites a g g 1 o m e r a t u s Whiteaves, Paleozoic Fossils. 1895. v. 3, pt 2, p. 48 



Numerous fragments consisting of rather long straight chains composed 

 of nearly round, rather large corallites have been observed at Rochester 

 and in the upper Shelby dolomite. Hall termed forms with this char- 

 acter Catenipora agglomerata. Nicholson reports the species 

 from the Guelph of Ontario ; while Lambe [pp. cit. p. 67, 68] believes that 

 the corallum of H. catenularius adopted the agglomerata mode of 

 growth when its lateral expansion was interfered with or restricted, and 

 asserts that both oval and circular corallites are found in the same corallum. 

 These fossils are too scantily represented in the Rochester material to per- 

 mit any conclusion in regard to the relation of the species in question. 



'Geol. Wisconsin. 1882. 4:271. 



