Wachsmuth and Springer—Silurian Crinoids. 259 
closely united by a series of intermediate forms, of which the 
Gl. Richardsoni is the last and most important link;” and also 
that “the Gi. Nealli....seems to be a as closely allied to 
Reteocrinus of Billings : as to Glyptocrinus.” Afterward, in the 
April, 1881, number of the same Journal, Prof Wetherby, with 
his new species Heteocrinus gracilis under gO eine makes 
the following statement, under the head of Reteocrinus: “ Under 
this generic name, Mr. Billings described two Goats from the 
Trenton rocks of Canada, in the publication cited above. 
Like most of the fossils of the locality whence they were 
obtained, these. were in a very poor state of preservation. 
our own 
Pons Meek, in re-describing ‘‘@/. Neal/i” in the Pale- 
ontology of Ohio, vol. i, p. 84, and having before him at the 
time many of the finest Cincinnati collections, alluded to the 
characters of this species as “showing a decided approximation 
toward Reteocrinus of Billings.” 
These extracts will be sufficient to show that so far as au 
thority, and the discoveries of the latest and most competent 
observers, could furnish a guide, we were fully warranted in 
referring al. O' Nealli and alhed species to Feteocrinus. 5h con- 
sons still more conclusive than those stated by the above men- 
tioned authors. We have considered Glyptocrinus a form of 
the utmost interest and importance, and have made it the 
foundation of our discussion of the family relations of the Ac- 
tinocrinids and Rhodocrinide. 
us now endeavor to ascertain what the Reteocrinus of 
peg really is; and we wish to state in this connection, that 
e yield to none in admiration for the work done by E. Bil- 
Rae in fossil crinoids. He was continually embarrassed by 
