FOSSILS OF THE DEVONIAN. 103 
prominent spinulose crests, extending through the whole length of the 
channels. Transverse diaphragms partly simple and complete, partly in- 
completé, represented by lateral squamiform, horizontal leaflets. Pores 
large and very numerous.” 
The species is represented by a single portion of a stem 28" in diam- 
eter; the polygonal, unequal orifices are about 1"™ in diameter and present 
the character given them by tbe author of the species, as do the diaphragms 
and large pores. Although there is no evidence of its being a branching 
form, as there is but a portion of a stem in the collections, it seems extremely 
probable from the close specific characters of the portion we have that it is 
specifically identical with the Upper Helderberg species. 
Formation and locality—lLower horizon of the Devonian limestone, 
central portion of Gray’s Canon, Eureka District, Nevada. 
Syringopora Hisingeri Billings. 1859. Can. Jour., un. ser., vol. iv, p. 116. 
In New York, Canada, Indiana, etc., this species occurs in the Upper 
Helderberg limestones, but at The Gate, northwest of Eureka, it is associ- 
ated with fossils of the Chemung horizon in the Upper Devonian beds. 
Numerous fine specimens were found, so that the specific identification 
hardly admits of question. 
Syringopora perelegans Billings. 1859. Can. Jour., n. ser., vol. iv, p. 117. 
Specimens referable to this species were found in the Lower Devonian 
beds at Lone Mountain, and also at the summit of the formation at The Gate, 
northwest of Eureka, showing its range through the entire Devonian forma- 
tion. It is extensively distributed in the strata of the hills east and west 
of Yahoo Cation. At the east it occurs in the Upper Helderberg limestones. 
Aulopora serpens Goldfuss? See Geol. Surv. Michigan, vol. iii, pt. 2. 1876. 
In size, manner of branching and reuniting of the tubes, this species 
of Aulopora from the Lower Devonian beds of Gray’s Cation corresponds 
to the descriptions and illustrations given of the American form identified 
with that species, and a comparison with the figures given by Goldfuss 
indicates that this identification is correct, although his figures show a some- 
what smaller and less robust form. 
