89 
or sub-quadrantal; the whole head bordered anterior- 
ly with a punctured fillet; body distinctly three lobed, 
middle lobe sub-cylindric, and not so broad as the 
side lobes.” 
Nurrainia Sparsa. LKaton. Cast No. 35. 
Fillet nearly straight in front of the middle lobe of 
the head, punctures of the fillet scattered irregularly, 
without any alternating ridges; head compressed, co- 
vered with scattered punctures, havi ing its side lobes 
much smaller than the middle one; middle. lobe with 
straight sides, giving it somew] vhat n 
rallelogram. 
Fouga J in pee grauwacke,* amet 
the head of one before me two anda half inches 
broad, and one and a half long. aes whole of the 
animal must have been six or seven inches in length. 
The above account is copied from the “ Text 
Book.” Mr. P8LOn,, was kind enough to lend me the 
only specimen of this curious fossil remain, which 
has yet been found ; from which his description was 
taken, and of which our cast is an exact copy. His 
generic characters do not in our opinion at all ap- 
ply to this fragment. Nothing but the head of this 
* In a manuscript note, Professor Eaton states that the. third 3 
grauwacke, or grit slate of ce ae “ alternates with the un- 
derlaying cherty cogent rock,” 
This opinion some of our geologi- 
cal friends, familiar with the formation at Coeymans, and with 
the Professor’ s nomenclature of rocks, have called in question. hie 
H2* 
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