50 PALEONTOLOGY. 



margins. The surface shows a finely granular appearance under a mag- 

 nifier. 



The thoracic segments seen lying in the same fragment of rock indi- 

 cate a rather distinct convexity for the thorax, with a rounded, moderately 

 prominent, mesial lobe, about two-thirds as wide as lie lateral lobes (see 

 fig. 10 h of plate 1). 



The glabella (fig. 10) found with the other specimens has a some- 

 what oblong outline, being longer than wide, with nearly parallel sides, 

 and a more or less rounded anterior end ; it shows two very faint lateral 

 furrows on each side, and a strong neck-furrow passing entirely across 

 behind. It retains the palpebral lobes on each side, and these indicate 

 rather large eyes, of lunate form, and rather more than half as long as the 

 glabella, exclusive of the neck-segment. They seem to have been located 

 rather near the glabella on each side, and less than their own length in 

 advance of the posterior margin of the cheeks. The surface appears to be 

 rather more coarsely granular than that of the pygidium. 



I know of no very closely allied species. 



Locality and position. — The typical and only known specimens of this 

 species were brought by Colonel Simpson from the west side of Steptoe 

 Valley, Nevada ; and, although not found associated with other fossils, they 

 are believed to belong to the Devonian epoch. 



OARBONIFEEOUS SPECIES. 



EADIATA. 

 POLYPI. 



FAVOSITID^. 



Genus SYRINGOPORA, Goldfuss. 

 Syeingopora (undt. sp.). 



Plate 6, figs. 2, 2 a. 



Corallites nearly parallel or moderately radiating, regularly arranged 

 at distances of about once to nearly twice their own diameter apart, gener- 



