FOSSILS OF THE DEVONIAN. 155 
The locality of the type of R. castanea is given as Lockhart River, 
British America, latitude, 67° 15’; longitude, 126° W. 
Formation and localities Upper Devonian limestone of Rescue Hill 
and the mouth of Packer Basin, and Lower Devonian on the west slope of 
County Peak, Eureka District, Nevada. 
Rhynchonella duplicata Hall. 
Plate xiv, fig. 8. 
Atrypa duplicata Hall, 1843, Rep. Fourth Geol. Dist. N. Y., Organic Remains of the 
Chemung Group, No. 67, figs. 2, 2 a—b. 
Rhynchonella (Stenocisma) duplicata Hall, 1867. Pal. N. Y., vol. iv, p. 350, pl. lv, figs. 
17-25. 
This species has hitherto been known in only a few localities of the 
Chemung Group in New York. Its author states that it is usually about 
three-eighths of an inch in length and breadth, rarely attaining the length 
of half an inch (12.5™). The size is less than that of the Nevada speci- 
mens, but otherwise the two are in all essential particulars specifically 
identical. A very perfect shell from the limestone east of the Sugar Loaf 
has a length of 18™™, with a width of 19", and corresponds in nearly every 
detail with the type of the species. A large number of perfect specimens 
were collected at Rescue Hill that present slight differences, which, how- 
ever, are not considered of specific value. The sharp angular plications 
and the margins of the sinus on the ventral valve are rounded and de- 
pressed; the shells are broader than long, having a proportion of 6 to 5, and 
usually more ventricose, which gives a deeper and more incurved sinus. 
Formation and localities—Devonian limestone. Rescue Hill and east 
of the Sugar Loaf, Eureka District, Nevada. 
Rhynchonella pugnus Martin. 
Plate xiv, figs. 7, 7a. 
Conchyliolithus anomites pugnus Martin, 1809, Petrificata Derbiensia, tab. xxii, figs. 4,5. 
Atrypa pugnus Sowerby. Geol. Trans. 2d Series, vol. v, pl. lvi, figs. 15-18. 
Terebratula pugnus Phillips, 1841. Paleozoic Fossils of Devon., ete., p. 87, pl. xxxv, 
figs. 156 a-e. 
anisodonta Phillips, 1841. Tbid., p. 86, pl. xxxiv, figs. 154 a-e. 
