190 



NEW YORK STATE MUSEUM 



Lockport limestone at Hamilton is here reproduced in text figure 93 by a 

 pen drawing made under Gurley's supervision. In plate 2, figure 4 a portion 

 of the same specimen which is partly weathered has bee.i refigured to show 



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Fig. 93 I n o c a u 1 i s p 1 u m u 1 o s u s Hall. Rhabdosome from Niagaran of Hamilton, Out. Original in 

 National Museum. Nat. size 



the thecae. Where in unweathered specimens the perisark is partly broken 

 away (as in pi. 7, fig. 1), the circular sections of the composing tubes can be 

 seen and the whole branch is found to be composed of apparently equal 

 tubes, 



