Now i] ACTINIARIA OF THE BAHAMAS. 59 
Tribe EDWARDSI. 
« Actiniaria with eight septa; among which are two pairs of 
directive septa, whilst the remaining four septa are not paired ; 
all the septa furnished with reproductive organs; tentacles 
simple, usually more numerous than the septa.” (R. Hertwig 
’82.) 
I was not successful in obtaining any forms belonging to this 
tribe, though they undoubtedly occur in the Bahamas. Dr. H. 
V. Wilson informed me that during his stay at New Providence, 
which terminated at the time of my arrival, he obtained several 
young Edwardsias in the tow-net. This method of collecting I 
did not follow very systematically, and amongst the material 
brought in found no Edwardsiz, 
Tribe ZOANTHEA. 
Actiniaria provided with paired mesenteries, each pair con- 
sisting of a large perfect macroseptum and a small imperfect 
microseptum, except in the cases of the two pairs of directives, one 
of which, the dorsal, consists of two microsepta, and the other, 
or ventral, of two macrosepta. In some forms the second pair 
of septa from the micro-directives on each side consists of two 
macrosepta. Each pair is provided with transverse muscles 
on the faces turned toward each other, except the directives, 
in which the muscles are on the faces turned from each other. 
The increase in the number of the mesenteries takes place by 
the formation of new pairs in the interspace on either side of 
the ventral directives. 
Family Zoanthidz. 
Zoanthee, in which the individual polyps are usually united 
into colonies; the various individuals being either connected 
by stolon-like canals or by a common expansion (coenenchyma), 
with the endodermal cavities of which the cavities of the polyps 
unite. 
Cuvier (’’98) was the first to separate the Zoanthids from the 
other Actinians, defining the group as consisting of forms “ qui 
ont la bouche et les tentacules comme les Actinies, mais dont le 
