366 TRANSACTIONS OF THE CANADIAN INSTITUTE. [VoL. VIII 
Tentaster, Eugaster and Ptilonaster of Hall and a new genus 
Bundenbachia. 
Still another Protaster is described by Dr. J. W. Gregory in Vol, 
iii of the Geological Magazine for 1889. This form, P. brisingotdes is 
particularly interesting as it is from the Lower Silurian of Victoria, 
Australia. 
In Vol. xxxvi of Palzontographica Dr. Stiirtz makes the Ophio- 
encrinasteria include Tenzaster, Bill, Eugaster, Hall, Paleophiura, 
Stiirtz, Bundenbachia, Stiirtz, Protaster, Forbes, Protaster, Billings, 
Protaster, Hall, and Protaster, Gregory. He makes the significant 
statement that all these Protasters are different genera bearing the 
same name. To his other group, Paleamphiuride (Protophiureez) he 
removes Protaster div. sp. Salter. 
In the later of these works, Dr Stiirtz has defined the genus 
Protaster, and he has placed in separate groups different species formerly 
referred to that genus. 
A re-examination and description of Forbes’ type had become 
necessary ; this was done by Dr. J. W. Gregory, and his results appear 
in a modern classification of the Paleozoic Ophiuroidea in the Proceedings 
of the Zoological Society of London for the year 1896. An outline of 
this classification, as far as forms previously ascribed to Protaster is 
concerned, follows : 
Order. LYSOPHIUR&, 
Ophiuroidea of which the ambulacral ossicles are alternate and are 
not united into vertebral ossicles. There are no ventral arm plates, and 
the under side of the arm is occupied by an ambulacral furrow. 
Family I, Protasteride. 
Lysophiure which have doot-shaped ambulacral ossicles. Each of 
them consists of a “body” lying beside the middle line of the arm, and of 
a lateral ‘‘ wing” projecting transversely from the body of the ossicle. 
Genus I. Protaster, Forbes. 
Synonyms ; 
Protaster, Hall. 
Protaster pars of Salter, Miller, Billings, Gregory, Stiirtz. 
