36 NEW YORK STATE MUSEUM 



the more as Rominger, in his very elaborate description of the latter, 1 

 points out that it is very variable in the size of the tubes and their mode of 

 growth. The dimensions of the two species, as given by these authors, do 

 not differ materially ; the critical difference therefore rests only in the more 

 verticillate arrangement of the connecting tubes of the one species, which, 

 as the Shelby material suggests, may take place at the same level in one 

 place and at different levels in other portions of the corallum, so that the 

 latter species may be based on an extreme variation. 



Should Syri ngopora infundibulum prove to be a synonym 

 of S. v e r t i c i 1 1 a t a, the form is not restricted to the Guelph but also 

 extends down into the Lockport limestone, from which S. verticillata 

 was described, Goldfuss's types having come from the Niagaran of Drum- 

 mond island. 



The only Syringopora which is described from the Niagaran of New 

 York is S. multicaulus Hall, which is said to occur in the Lockport 

 limestone. It appears from the original drawings of that species, that its 

 corallites are smaller than those of S. infundibulum, and the connect- 

 ing processes must have been very far apart. 



HYDROZOA 

 STBOMATOPOBA GoldfuSS. 1826 



Stromatopora galtensis Dawson (sp.) 



Plate i, fig. 13 



Coenostroma galtense Dawson, Life's Dawn on the Earth. 1875. p. 160 

 Coenostroma gait ens e Dawson, Quart. Jour. Geol. Soc. 1879. 35:52 

 Cf. Strom atopor a const e 1 lata Hall, Paleontology of New York. 1852. 2:324 

 Stromatopora galtensis Nicholson, Monograph on British Stromatoporidae. 



1891. p. 173 

 Stromatopora galtensis Whiteaves, Paleozoic Fossils. 1895. v - 2 >P t 3P-S 2 



Both at Rochester and in the upper horizon at Shelby occur broad, 

 flat masses with distinct astrorhizae on the surface but with the interior 

 mostly dolomitized. These fossils are very similar to Stromatopora 



'Geol. Sur. Michigan. 1876. v. 3, pt 2, p. 80. 



