265 
The Thujaria-group is characterized as follows: „Die Hydro- 
theken raehr oder weniger alternirend, oft fast opponiert gestellt, 
dicht benachbart und rnehrere bis viele auf ein Internodiuiu ge- 
llåuffc ;.; Miinduug der Theca meist glatt, Deckel einfach. — 
Hierher gehoren: Diphasia alata Hin c k s, Sertularia jilicula Eli. 
et Sol., abietina L., argentea Eli. et Sol., cupressina L., Thujaria 
thuja u. lonchitis ; Sertularia diffusa All mann, elongata Lmx., 
teuera Sars, maplestonei Bale, huttoni, Diphasia mutulata Busk, 
Dynamena tubuliformis Markt.” Of the above species Diphasia 
(data and D. mutulata, Sertularia jilicula and S. abietina belong 
to Diphasia (the two latter to the subgenus Abietinaria), Sertularia 
argentea , S. cupressina, S. tenera and Dynamena tubuliformis to 
Sertularia, Thujaria thuja and Th. lonchitis to Thujaria and Ser¬ 
tularia maplestonei to Odontotheca. An opercular apparatus has 
hitherto not been found in Sert. elongata and S. huttoni, both of 
whicli have the hydrothecal margin provided with 6—7 teeth, and 
if they possess an operculum I am most inclined to tbink that 
it consists of as many valves as there are teeth. In either case 
these two species cannot be referred to any of the hitherto de- 
scribed genera. — 
Schneidei 1 ) after having given the above phylogenetic 
sketch declares, that to penetrate deeper into the phylogeny of the 
Sertulariidae the close examination of a large living material shall 
be necessary, especially in order to make a thorough study of the 
difficult opercular apparatus. I quite agree with the author on 
this point, but as long as he adheres to the view that the colonial 
chaiacteis are the true generic characters, I cannot see that the 
results of such a study may be of any great use to him. He 
concludes his phylogenetic considerations with the following wish: 
„So steht denn zu hoffen, dass die zukiinftige Forschung wohl im 
Einzelnen das hier vertretene System nfther ausbauen und er- 
lauteren, nicht aber es zu Gunsten eines einzelnen diagnostischen 
b p. 524. 
