98 CARBONIFEROUS PERIOD. 



will answer the description of every imputed specific fonn of the genus yet 

 known to me. Intermediate forms may also be obtained in the same region 

 that may be made to connect all the varieties refeiTed to. Remembering 

 also that these shells were formed by animals, each of which consisted of a 

 mere particle of organless sarcode, not having even the least differentiation 

 of tissue, the wonder seems rather that intra-specific variation should not 

 be much greater than the difference is found to be between any individual 

 shells hitherto referred to the genus Fusulina. 



Position and locality. — Strata of the Carboniferous period at the follow- 

 ing localities in Utah, besides others elsewhere : Wasatch range, south of 

 Spanish Fork ; U-i-ya-bi Pass, Gosute range ; near Beckwith Spring, Cedar 

 range ; near the mouth of Spanish Fork Canon ; and southeast of Mount 

 Nebo. 



RADIATA. 



Class ACTINOZOA. 



Order ZOANTHAHIA. 



Family FAVOSITID^. 



Genus OH^TETES Fischer, 1837. 

 Chaetetes milleporaceus Troost, sp. 



Plate VI, fig. 2 a. 



Calamapora milleijoraeea Troost, 1849? (rijauuscript). 



Chcetetes milleporaceus Edwards et Haime, 1851, Mouograpbie Polyp. Fossiles, 272. 



Polypary massive ; cells slender, capilliform in aspect, of nearly equal 

 size among themselves and of uniform diameter from their proximal to their 

 distal ends ; diameter of cells about one-third of a millimeter, and upon the 

 split surfaces of some specimens they have been traced continuously nearly 

 the length of a decimeter ; masses varying in size from four or five centi- 

 meters to as many decimeters in diameter ; shape of the masses irregularly 

 globular to irregularly flattened-convex, the latter being the most usual 

 form. Sometimes specimens, apparently of this species, are irregularly 



