18 
AUG. F, FOERSTE 
Column slender, about 1.8 mm. in width. Columnals vary- 
ing between 0.4 and 0.5 mm. in length, frequently alternating 
with much shorter intercalated columnals. 
Locality and 'position. In the upper part of the Dayton lime- 
stone, at the base of the Niagaran division of the Silurian, along 
the side of the Germantown pike, southeast of the Soldiers Home, 
west of Dayton, Ohio. Named in honor of E. 0. Ulrich, whose 
Fig. 1. Clidochirus ulrichi sp. nov. Diagram of Plates, with Anal Side 
AT Top 
investigations have enriched every department of Palaeozoic 
Paleontology. 
Remarks. If, in accordance with the investigation of Springer, 
the lowest plate in the right posterior arm series be interpreted 
as the ‘hadianal in its primitive position under the right posterior 
radial,” then the first costal of the preceding description becomes 
the radial, and the right posterior arm is credited with only two, 
