Wachsmuth and Springer—Silurian Crinoids. 261 
Pattersoni Miller, and Gil. subglobosus Meek, all from the Hudson 
River Group at or near Cincinnati; and this may be taken asa 
sufficient answer to Mr. Miller’s statement, on page 13 of the 
author’s edition of his paper before cited, of the essential char- 
acters of Reteocrinus. 
In 1869, in a letter to one of the writers, Billings himself 
stated that Glyptocrinus O’Nealli was certainly not a Glypto- 
crinus, and indicated its probable relationship to Reteoerinus. 
Unfortunately we are unable to find his letter, or we should 
quote his exact language. 
has our warmest thanks. We quote the following extract from 
his letter of July 10th, 1882: 
‘“Your communication contains an uncleaned but very per- 
fect specimen of Glyptocrinus O’ Nealli Hall, (Reteocrinus O’ Nealli 
of Wetherby, Wachsm. and Spr., and others) with a request 
that I compare it with the type specimen of Reteocrinus in the 
Canadian Survey Museum, and inform you as to the acts. 
Prof. Whiteaves, Palsontologist G. S. C., with his characteristic 
kindness, granted me full permission to examine the type speci- 
mens of #. stellaris, and I have given special attention to those 
figured in Decade iv, G. S. ©., as ‘ figs. 4a, 4d.’ Both these 
Specimens are obscured by a hard adherent matrix, which in so 
valuable specimens would require a skilled lapidary to remove ; 
however, with a soft brush and a little moisture, I readily re- 
on the specimen 4a), and are heptagonal, resembling a hexagon 
slightly truncate, they have ridges corresponding with, and 
