12 NKW YORK STATE MUSEUM 



and iipiK^r l)ici'llo«,Maptus shales of Canada, and is also not uufre- 

 qucnt in tlu* lower Dicellogiaptus or Normans kill shales of New 

 York. In thi* conglomerate of Rvsedorph hill it was found 

 .mbeddvd in black compact limestone, associated with Ptery- 

 <: o m (' t (> p u s c a 1 1 i e e p h a 1 u s, A m p .v x li a s t a t u s, 

 (' n 1 1 n |i n 1- ;i iii 11 I t 1 t a l) u 1 a t a . ((iroup 5) 



CRINOIDEA 



Joints of stems only are found to constitute some gray lime- 

 stone jx^bbles of Kysedorph hill. (Group 7) 



CYSTIDEA 



Plates of P a 1 a e c y s t i t e 6 semi r a d i a t u s liillings 

 were found in the crystalline, black Chazy limestone, and a few 

 I)lates of a (ilypto<^ystites in the compact, black Trenton lime- 

 stone, associated with I 1 1 a e n u s a m e r i c a u u s and si>ecie8 

 of Tretaspis. (d roups S and 5) 



BRYOZOA 

 STOMATOPORA BrOUU 



Stomatopora inflata Hall .s-p. 



A 1 e c t o 1 n f 1 a t a Hall. Pal. N. Y. l!<4T. 1 :77 



PI. 1, fig. 2, 3 



Zuaria of this pretty bryozoan were found to grow frequently 

 on the cranidia and pygidia of I s o t e 1 u s m a x-i m u s in the 

 black compact limestone; they show the characters of the species 

 as first described by Hall and later more fully defined by Ulrich. 

 A finely i)reserved group attached to a R a f i n e s q u i n a 

 deltoidea shows a remarkable variation from the typical 

 expre^^sion of S t o m a t o p o r a i n f 1 a t a in having the zooecia 

 abruptly contracted, and the proximal end tubular and slender, 

 thus closely approaching a form described by Flrich as 

 Stoma 1 oiMM-a t ii rgi da from ili«- upper beds of the *' Hud- 

 son river group" at Wilmington HI.; the difference between the 

 two consisting in the more spheric shape of the inflated part in 

 the Hudson river form and the more pyriform to cVlindric develop- 

 ment of the same part in the Rysedori»h hill specimens (fig. 3). 

 The lack of frequent branching is also common t(> iH^th. 



