Plate IV. 
Isorophus inconditus (Raymond). (Page 12.) 
Pour specimens in their natural position., resting on the sea bottom, 
showing that they were not attached to shells or other objects. With 
the decay of the animal the central portion sank in, leaving an elevated 
row of marginal plates. The largest specimen is the holotype. 3-2 times 
natural size. No. 14i09. From the middle Trenton at Queens wharf, 
Ottawa, Ont. 
