264 Wachsmuth and Springer—Silurian Crinoids. 
clearness in scientific determinations. We do not believe they 
require absurdities, but if any of them does, the sooner it 1s 
abrogated the better. 
Mr. Miller thinks that in making GJ. O’Nealli the type of 
Reteocrinus, we have been guilty of an “open violation of the 
rules of nomenclature.” We think our practice in this respect 
fully justified by the consideration above stated. At all events 
we shall adhere to it, and we find that other good authorities 
do the same thing. 
w words now as to the relations of these two genera. 
exhibiting an approach to some of the earlier forms of th 
Actinocrinide. Its close affinities with Reteocrinus, with which 
we stated (p. 183), it to be “connected by most remarkable 
transition forms,” led us to refer Glyptocrinus to the Rhodoerin- 
ide, although there were almost as good reasons for referring 
it to the Actinocrinide. It might perhaps have been well to 
place it in a section by itself, on account of the exceptional 
disposition of its interradials. 
It is an important fact that in all Actinocrinide, without 4 
single exception, the regular interradial series rest upon the 
edges of the first radial plates, and are not extended down to the 
ocr 
barely touch them. Glyptocrinus is the only genus of the 
Rhodocrinidz in which neither the anal nor interradial plates 
are in line with the first radials, or in contact with the 
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oS ON sn ia Bs 
