FOSSILS OF THE DEVONIAN. 



155 



The locality of the type of E. 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. . 



Rhynchoiiella duplicata Hall. 

 Plate xiv, fig. 8. 



Atrypa duplicata Hall, 1843. Kep. Fourth Geol. Dist. N. Y., Organic Eemains of the 



Cheinung Group, No. 67, figs. 2, 2 a-b. 

 Khynclionella (Stenocisma] duplicata Hall, 1867. Pal. N. Y., vol. iv, p. 350, pi. Iv, 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 mm ). 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 mm , with a width of 19 mm , 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. 



Rhynchoiiella puguus 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, pi. Ivi, figs. 15-18. 

 Terebratula pugnus Phillips, 1841. Paleozoic Fossils of Devon., etc., p. 87, pi. xxxv, 



figs. 156 a-e. 

 anisodonta Phillips, 1841. Ibid., p. 86, pi. xxxiv, figs. 154 a-c. 



