NIAGARA FALLS AND VICINITY 



151 



Found in the Rochester shale at Niagara, Lockport and other 

 places. Often very abundant. At Niagara it has been found as 

 low as 4 feet above the Clinton limestone, and from that upward 

 as far as the Bryozoa beds, in which it occurs in moderate abun- 

 dance. It has not been found above these beds. It occurs chiefly 

 in the calcareous layers of the shale, from which it weathers out, 

 the nut-like calyxes rolling to the bottom of the section where they 

 can be picked up by the side of the railroad track.^ 



Genus callocystites Hall 



[Ety.: xa/lAo?, beauty; y.{j(7Ti^, bladder] 



(1852. PalN. Y. 2:238) 



Calyx composed of large plates arranged in three or four cycles 

 and having four pectinated rhombs, the component halves of which 

 stand on contiguous plates and 

 are separated by an interval. 

 Mouth slit-like, and forming the 

 center of radiation for two to five 

 pinnulated arms, which some- 

 times bifurcate, and are pro- 

 tected by covering pieces, and 

 either repose on the calyx or 

 are sunk below the surface in 

 grooves. Stem well developed, 

 tapering down to a point. 



Callocystites jewetti Hall (Fig. 

 47) (1852. Pal N. Y. 2:239, 

 Pl- 50) 



Distinguishing characters. Ob- 

 long ovoid, nearly symmetric 

 form; base of four plates, one 

 bearing part of pectinated rhomb; 

 eight plates in second cycle; anal 



, ' Fig. 47 Callocystites jewetti with the armgrooves 



aperture between second and spread out 



third cycle, excavated in two plates of the former and one of 

 the latter; surface of plates ornamented by polygonal depressions, 

 having a more or less defined border and granulose surface. 



'Specimens of this " crinoid " may be purchased from John Garlow, the 

 watchman on the middle section of the New York Central railroad cut in 

 the gorge, at a moderate price. 



