regarded as sea anemones allied to Haicampa an I Cerianthus, but 
anatomical investigation shows them to differ from all Coelenterates 
in just that feature which has been regarded as diagnostic of the 
group, while on the other hand they have many points in common 
with the actinians. For them Dr. Danielssen has made the Tribe 
Aegireae which he defines as '* Actinida, with a perfect body cavity 
(Coelom) and a developed digestive apparatus consisting of oeso- 
phagus, stomach and anus." The two genus are called Fenja and 
Aegir, names derived from Scandinavian mythology. In general 
so-called 
thus partially (Aegir) or completely (Fenja) separating the digestive 
from the mesenterical spaces, while in both an anus is developed in 
the base. In both the coelome thus formed is divided by twelve per- 
fect septa, but in Aegir these spaces communicate by twelve slender 
fissures with the rectal area of the digestive tract. In Fenja there are 
twelve genital pores around the anus, outside the rectum ; in Aegir 
the genitalia are more like those of ordinary sea anemones. Both 
forms are hermaphrodites. 
As will be seen these forms which in every other respect are true 
sea anemones differ from all coelenterates in the distinction between 
digestive and coelomic cavities. On the other hand they differ 
from the true Coelomata in the fact that each coelomatic space ex- 
tends the length of the body. While interesting, in a general way, 
as indicating a possible development of the coeloma of higher 
animals from the mesenterical space of an actinian, we cannot re- 
gard them as being links in the line connecting the Coelenterata 
with segmented animals, according to the theories of Balfour and 
Sedgwick, for that demands the conversion of the coelenterate mouth 
into mouth and anus, while the anus of Aegireae is clearly not de- 
rived in this way, but is rather a perforation through the base of 
attachment of the ordinary sea anemone. Occasionally such " anal 
pores " occur in the Cerianthidse. An extensive account illustrated 
by over twenty plates is promised at an early date. 
The Eyes of Trilobites.— Mr. J. M. Clarke gives an account 
of the eyes of the trilobite Phacops rana m \\\q Journal of Mor- 
phology, Vol. II., 1888. He divides the trilobites into two groups, 
Holochroal and Schizochroal, according as the external surface of 
the cornea is faceted or not. The Phacopidse belong to the latter 
group, and their eyes are to be regarded as aggregate rather than 
compound. The corneal lenses were hollow or filled with some sub- 
stance different from the cornea. Nothing like a crystalline cone 
has been preserved. Until maturity the number of eyes in an optical 
organ increases by the addition of new lenses at the ends of the 
diagonal rows, and these new lenses are apparently formed by a 
thinning of the integument. (The reporter would remark that there 
seems to be a difference in the way in which, according to Mr 
