oG4 Ji. S. Lull — ^tegomui'us unyulatus Marsh. 



In the year 1887,* however, Professor Marsh removed the 

 si)ec*iiuen No. 1858 from tlie species S. nngidatus, makiiip; it 



Fki. ;!. 



Fig. 3. Mounted skeleton. Front view. 



the holotype of a new species, S. duplex. The specific dis- 

 tinctions, as the author gave them, lay entirely in the sacrum, 



* This Journal (3), xxxiv, p. 416. 



