JTo. 2.] WHITE ON CARBONIFEEOUS AND CEETACEOUS FOSSILS. 213 



is nearly related to, if not identical with, G. lotohlastiis T\'liite.* G. loto- 

 hlastus was discovered at Ewell's Spring, Arizona, associated Avitk a 

 species each of Syringojpora and Favosites, which I identified {loc. cit. inf.) 

 respectively as 8. harveyi T\Tiite and F. divergens White and ^ATiitfield. 

 The two last-named species occur in the Subcarhoniferous strata at Bur- 

 lington, Iowa, where the type-specimens were obtained. Granatocrinus 

 lotohlastus is also recognized as closely related to G. melo Owen and 

 Shumard, from the same locality and group. Xo serious doubt has 

 been entertained of the Subcarboniferous age of those Arizona strata f 

 but there is much reason to believe that the strata from which the Gra- 

 natocrinus found by Prof. St. John was obtained belong higher in the 

 great Carboniferous series. The fossils at present known to be associ- 

 ated with this Blastoid are a Syringopora, apparently identical with S. 

 harveyi White; a /S^'in/dr, which seems to be identical with S.rocl'y- 

 tnontanus Marcou ; a BhyncJionella, related to both E. metalUca White 

 and E.pustulosa White; a Hemipronites, like S. crenistria Phillips; be- 

 sides some fragments of Fenestella and a few segments of crinoid stems. 

 All these types except the Blastoid are common to both the Subcar- 

 boniferous and Coal-measure groui)s; but hitherto no Blastoid has 

 been discovered in American strata above the Subcarboniferous. If 

 the foregoing specific identificatious are correct, there is in this case also 

 a commingling of Subcarboniferous and Coal-measure forms; but the 

 paleontological e^^idence seems to be greater in favor of the Subcarbon- 

 iferous than the Coal-measure age of the strata from which the fossils 

 in question were obtained. This view is also supported by the fact 

 that Prof. St. John obtained the fossils from the " earlier member of the 

 Carbonifrous series" in that region. This earher member no doubt rep- 

 resents, at least in part, the Subcarboniferous grouj) of the Mississippi 

 Yalley ; but, as has already been shown, the means of defining a distinct 

 Subcarboniferous group in that far western region are yet wanting. 



POLYZOA. 



Genus Aechimedes Lesueur. 



Archimedes ? 



Among Dr. Peale's collections from Mount Darby, Wyoming Eange, 

 Western Wyoming, are several specimens of an undetermined species of 

 Archimedes compactly imbedded in limestone. Their generic identifica- 

 tion is unmistakable; but the condition of their preservation is such that 

 the character and arrangement of the fenestrules and i)ores cannot be 

 satisfactorily determined. The aspect and character of the axis are 

 essentially like those of the two well-known species found in the Keokuk 

 and Chester limestones respectively, of the Lower Carboniferous group of 

 the Mississippi Yalley; but none of these are sinistrally coiled, as some 

 of those are. Judging from the strati graphical position of these speci- 



"" See Expl. and Sur. West of tlie lOOtli Merid. (Wheeler), vol. iv, part i, p. 80, pi. 

 V, figs. 3 a aud 3 h. 



