15 



CARBONIFEROUS. 

 SUBCARBONIFEROUS PERIOD. 



POLYPI. 

 Genus FAVOSITES Lamarck. 



FAVOSITES WHITFIELDI White and Whitfield (manuscript). This 

 species, described by White and Whitfield, from the Subcarbouiferous 

 rocks at Burlington, Iowa, without a specific name, (Proc. Bost. Soc. 

 lN~at. Hist., vol. VIII, page 306), is identified among the collections made 

 from the upper horizon at EwelPs Spring, Arizona. 



BLASTOIDEA. 



Genus GRANATOCRIXUS Troost. 



GRANATOCRINUS LOTOBLASTUS (sp. nov.) Body subelliptical ; great- 

 est width about the middle; distinctly, but not very deeply pentalobate 

 at the base, truncate at top ; base depressed ; basal plates very small ; 

 radial plates apparently very short, and embracing only the lower 

 extremities of the pseudambulacral areas ; interradial plates long and 

 narrow, apparently reaching the summit ; a comparatively shallow, ver- 

 tical furrow along the center of each ; anal plate prominent at its upper 

 end ; pseudambulacral areas prominent, narrow, reaching down to or 

 below the plane of the basal plate, as seen by side-view. 



Height, nine millimeters ; transverse diameter, seven millimeters. 



The aspect of this species is much, like that of G. melo Owen and 

 Shnmard, from the Subcarboniferous rocks of Burlington, Iowa ; but it 

 differs in its less robust form, and in not possessing the distinct longi- 

 tudinal lobes of that species. In that species, the pseudambulacral 

 areas are depressed, while in this they are the more prominent portions 

 in the outline of the body. 



Position and locality. Strata of the Subcarboniferous period, E well's 

 Spring, Arizona. 



GRINOIDEA. 

 Genus PLATYCRLXUS Miller. 



PLATYCRINUS ? Upon the weathered surface of a piece of 



limestone in the collection, there are three or four more or less imper- 

 fect criuoids, partly imbedded in the rock, and partly defaced by 

 weathering. One of these is a Platycrinus, as shown by characters other 

 than the body-plates, which cannot be distinguished. The outline of 

 the calyx is clearly shown ; it is broad, cup shaped ; base depressed at 

 the center; arms branching two or three times; branches slender; the 

 whole upper part of the body prolonged into a proboscidiform mass, 

 about three times the height of the calyx, and standing erect between 

 the arms. Stem slender, composed of joints of unequal size. 



This species resembles P. Icevis Miller, as figured by De Koninck 

 and le Hon (Recher. Grin, da Terr. Garb, de la Belgique), but is not so 

 robust. The observable details indicate that it is a different, and proba- 



