158 Scientific Intelligence. 
periods about Great Britain has been thought to show that the 
Gulf Stream was probably flowing northward then as now and 
producing similar effects on British climate. This is not inconsist- 
ent with the conclusion above cited; since the connection between 
the Gulf and Atlantic, according to Mr. Agassiz’s deduction, was 
imperfect enough to have interfered much with the transfer of 
deep-sea life from one to the other, which condition would have 
required that the depth between the two should not have exceeded 
75 or 100 fathoms, and in that case there would have been an 
Atlantic as well as a Pacific branch to the so-called Gulf Stream. 
5. Glyptocrinus re-defined and restricted, Gaurocrinus, Pye- 
nocrinus and Compsocrinus established and two new species 
scribed by S. A. Mutter. Jour. Cincinnati Soc. Nat Hist., vi, 
Dec., 1883.—The following observations on the vault of Glypto- 
-_erinus decadactylus are from this paper, the author of which has 
in his collection all the species of thé genus excepting two from 
the Trenton and Hudson River group. They are from a letter 
on the paper received from the author.—The vault in this species 
is slightly convex in the central part and undulating toward each 
interbrachial area. It is composed. of 
rs a 
central tubercle or spine. Toward the margin the plates are 
smaller 
sides of the ambulacral furrows. This continuation of the vault 
up the inner side of the arms I have observed for more than a0 
inch above the vault, and have specimens at hand illustrating 1% 
and entertain no doubt that it extended as far as the arm furrows 
themselves. The pinuules do not cover the arm groove, 
become free upon each side of it, leaving an angular roof betwee? 
: } ; ; ” 
hand, no cowering has ever been discovered with true pinnule 5 
and, finally, they come to the conclusion that the plates cover@s 
I do not understand how or why pinnules should, in any coy 
act as a covering to the ambulacral groove, and I have 
very numerous plates. — 
and each bea 
; 
never, 
seen any evidence of their performing such a function, and cap 
distinctly disprove it by specimens belonging to several different 
genera, ma 
