FOSSILS OF THE DEVONIAN. 



Ill 



New York specimens of the genus, P. clarus, Hall, of the same work, plate 

 xx, fig. 12, is nearly identical with the Nevada form, its greater width and 

 less convexity distinguishing it, also a slight difference in the details of 

 the border of the head, features that in many species of the genera Caly- 

 mene, Asaphus, etc., are not of specific importance unless very strongly 

 marked. 



Formation and locality. Lower horizon of the Devonian limestone; 

 Comb's Peak, Eureka District, Nevada. 



Genus PHILLIPSIA Portlock. 

 Phillipsia coronata Hall f 



Phillipsia f (Bracliymetopus f) ornata Hall, 1876. Pal. N. Y., Illustrations of Devonian 



Fossils, Crustacea, pi. xxi, fig. 1 (Nat. P. ornata Portlock 1843). 

 coronata Hall, 1877. Cat. Amer. Pal. Foss., Miller, p. 221. 



The central portion of the head is alone preserved in the specimen 

 from Nevada ; lateral compression has distorted its outline and convexity 

 so that the comparison with the fragment -from the Hamilton Group of 

 New York, in which the glabella and frontal border is preserved, is neces- 

 sarily imperfect, but from the close relations of the two, the species from 

 Newark Mountain is for the present referred to Phillipsia coronata. 



Formation and locality. Middle horizon of the Devonian limestone; 

 Newark Mountain, Eureka District, Nevada. 



SUPPOSED EGGS OF THE TRILOBITE. 



Numerous small, spheroidal bodies, one-half a millimeter in diameter, 

 occur in the Devonian limestone of Lone Mountain in association with the 

 iragmentary remains of Phacops rana, Proetus marginalis, and Dalmanites 

 Meeki. In appearance they resemble the forms illustrated by M. Barrande, 14 

 which he considers the eggs of the trilobite. A careful examination does 

 not lead me to make any other reference of them, as they answer very 

 closely to what I would conceive as the ova of the trilobite, and their 

 association with the remains of trilobites also favors this view. 



"Syst. Sil. BohSme, p. 270, vol. i, Trilobites, pi. xxvii, figs. 1-3, 1852. 



