Bhi 
, through two of the cups. There is a cen 
Fe net OL OE EE ee ee ee ee ee een See oe ee Pena 
Mineralogy and Geology. 419 
II, MINERALOGY AND GEOLOGY. 
name, Paleacis, had not reached this pooner nor was it until very 
Illinois Report, that von Seebach had called attention in Zeitschr. 
Deutsch. geol. Gessellsch., xviii, to the identity of Palwacis 
and Sphenopoterium :—otherwise we would have cheerfully adopted 
the name Paleacis, which has priority of date, and must take 
precedence.* ; : 
In first publishing a notice of this genus ein 860, we regarded it 
i d al D 
Section of Corals. Ae : 
Being in considerable doubt in relation to the affinities of this 
mus at the time we were prep 
] 
the request that he should give us some suggestions In reg to 
the relations of the genus. After examination as 
could ade without preparing sections for the microscope, Prof. 
ais ; . re definitel 
eeling a desire to settle more de : eee prepared a sec- 
a 
the external character, is entirely unlike any known cor ve 
or fossil, but agrees very well with several forms of fossil sponges. 
The section has been vertically across the shorter diameter, 
® Von Seebach is in error, however, in saying our description was published 
in 1861, as it was issued in 1860, but after Haime’s, if Iam not mistaken. 
