364 TRANSACTIONS OF THE CANADIAN INSTITUTE. [Vo.. VIII. 
form from the Lower Helderberg as P. forbesz. The same year Hall 
describes Onychaster (FProtaster) barrist in “ New Crinoidea from the 
Burlington group.” The same author revises his description of P. forbese 
in the 20th Report of the Regents of the State of New York, 1868. 
With regard to the shape of the ambulacral plates he says “The 
ambulacral plates are obliquely quadrangular and alternating to a 
slight degree. The pores are comparatively large, truncating the outer 
adjacent angles of the ambulacral plates.” The figures of this species in 
Vol. iii of the Paleontology of New. York were based on a misconcep- 
tion, which the author has corrected in the article cited above. Making 
allowance for this emendation, the ossicles may be said to alternate and 
to possess a “boot-shaped” inferior aspect. Ze@xzaster of Billings is 
also reviewed by Professor Hall, who thinks a disc can be discerned in 
the type specimen of 7. spzxosus and adds “ The structure of the ray is 
precisely of the same character as the ray of that species which I have 
named Protaster forbest.” With regard to 7. cylindricus he says “ The 
structure of the rays is very similar to that of Protaster.” In 1869 Meek 
and Worthen describe Pvotaster gregarius in the twenty-first volume 
of the Proceedings of the Academy of Natural Sciences of Philadelphia. 
In Vol. i of the Geological Survey of Ohio, in the year 1873, F. B. Meek 
describes Protaster granuliferus from the Cincinnati group of Moore’s 
Hill, Indiana. The disc of this species is covered with an integument 
filled with a vast number of minute grains of calcite. The ambulacral 
ossicles alternate, are rectangular at their inner ends and the outer 
anterior margin of each is largely excavated so as to form a large pore, 
It is stated that this species was referred to as A/epzdaster in the 
American Journal of Science for 1872: the reference can not be found, 
Miller and Dyer describe and figure P. flexwosus from the Cincinnati 
formation in the first volume of the Journal of the Cincinnati Society of 
Natural History, 1879. It would appear that the specimens are too 
imperfect ventrally, to allow a satisfactory description of the ossicles to 
be made. In the same volume E. O. Ulrich establishes the genus 
Protasterina with one species P. fimbriata. It would appear that the 
ambulacral ossicles are hour-glass shaped. Later reviewers have con- 
sidered this species identical with Protaster flexuosus of Miller and 
Dyer. 
In the Memoirs of the Geological Survey of Great Britain, Vol. 
iii, 1881, Dr. A. C. Ramsay re-describes P. saltercz. This species is 
founded on a single specimen which seems to have had a varied ex- 
