56 PALiEONTOLOGY. 



(though less decidedly so) from Professor Hall's, which certainly has the 

 septa more crowded, thinner, and (as also stated in the description) alter- 

 nately longer and shorter. 



It will be seen from the description that this coral agrees rather closely 

 in many of its characters with the last ; so closely, indeed, that I have been 

 much inclined to think it might be only a more slender variety of the same. 

 Still, its longer, more attenuated form, and very nearly equally numerous 

 septa, in rather decidedly smaller specimens, as well as the apparently dif- 

 ferent form of the bottom of its calice (see fig. 3 c,) and the direction of 

 the vesicles formed by the complex tabulae, if not deceptive, and constant, 

 would certainly be of at least specific importance. 



It is worthy of note, as already suggested with regard to the last, 

 that longtitudinal sections of both of these forms (but more particularly 

 that of the last) show that the tabulae curve upward so as to fomi a kind 

 of false columella seen projecting upward in the middle of the bottom of 

 the calice (see fig. 4 b), more nearly as in Clisiophjllwn and Lonsdalia than 

 I have ever yet observed in Zaphrentis. Still, they seem to differ from 

 those types in the possession of a septal fossula, very clearly seen, at least 

 in the species hex*e under consideration ; while neither of them presents a 

 fasiculate, composite, or astreifonn mode of growth, or shows any traces of 

 well-defined inner walls, as in Lonsdalia. 



I greatly regret having no opportunity to compare these and other far- 

 western fossils with the original types of species briefly described, and not 

 fully illustrated, man}'- years back, in Fremont's, Stansbury's, and other 

 Government reports, and can therefore only say that I have earnestly 

 endeavored, to the best of my ability, to identify the described forms from 

 the published figures and descriptions. 



Locality and position. — Boxelder and Logan's Peaks, Wasatch Range, 

 Utah, in a dark bluish-gray Carboniferous limestone. Professor Hall's 

 specimens of Z. Stansburii came from the same horizon, on Stansbury's 

 Island, Cloth Cap, and Flat Rock Point, Great Salt Lake. Dr. Ilayden's 

 party have also found this fossil quite abundant in the same kind of dark 

 limestone on the divide between Ross Fork and Lincoln Valley, and at 

 other localities in Idaho. 



