CLASS IL— ORDER II. 
GENERA AND SPECIES. 
JANIA. 
Mossy or liair-like, dichotomous, and articulated ; 
articulations cylindrical, axe or interior horny ; rind 
less cretaceous than that of the Corallinas. 
Former zoologists have united the Janias to the 
genus of Corallinas ; but these two groups of Polypi- 
doms have characters sufficiently distinct to admit 
their separation. The Corallinas are constantly 
trichotomous, whilst the Janias are as regularly di- 
chotomous ; the former have their articulations more 
or less compressed, frequently triangular, and only 
cylindrical in some parts of the Polypidom ; whilst 
the articulations of the latter are cylindrical from 
the base to the extremities. The position of the 
polypi may perhaps be different : however, every thing 
