106 PALEONTOLOGY OF THE EUREKA DISTRICT. 



or corallum are larger than the average in the species, but the specific iden- 

 tity of the eastern and western species is a very close one. 



Cystiphyllum Americanum Milne-Edwards. See Geol. Surv. Michigan, vol. iii, pt. 2, p. 

 138. 1876. 



As there is considerable variation in the size and form of the polyparia 

 and the vesicles, as well as the distinctness of the plications, in the forms 

 referred to this species, it is quite probable that the one under consideration 

 will fall within its limits. It presents all the characters common to many 

 New York and Ohio specimens, and we have little hesitancy in referring it 

 to this species. 



Formation and localities, Lower horizon of the Devonian limestone; on 

 the divide at the head of the Reese and Berry Canon, and at Lone Mountain, 

 18 miles northwest of Eureka, Nevada. 



Cystiphyllum, u. sp. 



There are two species of Cystiphyllum in the collection that do not 

 appear to be specifically allied to any described forms. One has the outer 

 surface studded with little nodes and the calyx of considerable depth, with 

 numerous sharp lamellae that in some instances are nearly concealed by 

 coarse vesicles. The corallum is about 40 mm in length, 20 mm to 2n mm in diam- 

 eter at the summit, and more or less strongly marked by broad ridges of 

 growth. The other species has the latter character in a modified degree, 

 but lacks the nodulose surface ; the interior of the calyx is filled with 

 vesicles from the center of which a young corallum springs. 



At Lone Mountain with the preceding and other species. 



Besides the above-mentioned forms, there are two species of Zaphrentis 

 too imperfect for description, and a large Cyathophylloid coral of unknown 

 specific relations. 



BRACHIOPODA. 

 Genus LINGULA Bruguiere. 



Lingula Leeiia Hall. 



Plate xiii, fig. 2. 

 Lingula leana Hall, 1867. Pal. N. Y., vol. iv, p. 9, pi. ii, fig. 12. 



The Nevada shell is not quite as elongate or rounded in front as much 

 .as the New York examples of this species, but it agrees with them in all 



