150 BULLETIN OF THE LABORATORIES 
In the following pages the sj^stem of classification used is that of 
Mr. E. O. Ulrich. This necessitates the change of many generic refer- 
ences. Unfortunate as tl\is may be, when a name has become familiar 
and has been universally adopted, it is necessitated by very clear and 
universally recognized facts. The description of bryozoa has until re- 
cently consisted chiefly of the characterization of the external features 
of the specimen. Specimens of very different structure have often 
been associated together in incongruous genera, on the evidence of 
external features alone. In consequence also of that system of classi- 
fication, generic values were ill understood, and types of genera 
could not prove a key to the situation. The new method has sought to 
furnish a scientific basis to this artificial classification, and an unflinch- 
ing application of the universally recognized rules applying to the type 
species of genera, has made the avoidance of such changes simply im- 
possible. In view of these facts it is rather amusing to notice the feel- 
ing among many of our American paleontologists that Mr. E. O. Ul- 
rich is unsettling the foundations of the classification of bryozoa, when, 
in fact, he and the prominent European students of bryozoa, are mere- 
ly doing all they can to give us a firm basis. Mr. Ulrich has assisted 
me so much in the investigation of bryozoa, by advice, criticisms, the 
presentation of specimens and the investigation of my own, that I can 
only express general indebtedness. 
FENESTELLIDyE, King. 
Zoaria reticulated by the anastomosing of stems, or fenestrated by 
the coalescence of the short non-poriferous branches of adjacent stems, 
the dissepiments. Poriferous on one side only ; the cells sub-tubular, 
their mouths rounded. 
Genus PHYLLOPORINA, Ulrich. 
Zoaria flabellate, perhaps infundibuliform when entire, consisting 
of anastomosing stems which form elongated, irregular meshes. Sec- 
tions made transversely at some distance from the poriferous side show 
only one kind of cells. Sections passing just beneath the surface 
seem to pass through short interstitial cells, which are closed at the sur- 
face. Species of this genus have usually been referred to Retepora^ 
Lamarck. 
