140 Scientific Intelligence, 
young mind. 
10. The animals of Millepora are Hydroid Acalephs and not Polyps ; 
by Prof. Acassiz, (from recent letters to J. D. Dana).—“TI have seen in 
the Tortugas something very unexpected. 
polyp, but a genuine Hydroid, closely allied to Hydractinia. This seems 
one can question the relation. With regard to the reference of all the 
Favositide (a group including Favosites, Favistella, Pocillopora, etc. 28 
well as the minuter Millepora, Chzetetes, etc.) to the Acaleph class, di 
evidence is not yet complete, as the animal of the Pocillopora has not 
been figured by any author on zoophytes.* On this point Professor 
Agassiz observes in a subsequent letter, after observing that the Side- 
ropore obviously are polyps: 
“There are two types of radiating lamella, which are not homologous. 
In true Polyps (excluding Favositide as Hydroids), the lamellie extend 
: i alon i 
artiti 
you see at once that the 
