II 



R Hertwig siger: .. Although the existing systems of 

 the Actiniæ undeniably require a complete remodelling on 

 a new foundation, I have relrained from this at present, 

 as the material investigated by me was insufficient. I 

 only considered it absolutely needful to form some larger 

 divisions anew in order to express in some measure the 

 eonditions of relationship among the forms. I have tåken 

 the structure and arrangement of the septa as the funda- 

 mental principle, and distinguish six Tribes of Actinaria: 

 1 Hexactiniæ; 2. Paractiniæ; 3. Monauleæ; 4. Edwardsiæ; 

 5. Zoantheæ; 6. Oeriantheæ." 



Til 4 af de her nævnte Stammer (Tribus) har jeg 

 kunnet henføre de paa den norske Nordhavsexpedition 

 fundne Aetinida; men desforuden har jeg været nødsaget 

 til at opstille en ny Tribus, nemlig „Ægireæ", hvortil jeg 

 har henført to Slægter, som egentlig ikke ere Coelenterater, 

 forsaavidt de ere udstyrede med et udpræget Coelom ; men 

 at danne en hel ny Klasse for disse to yderst mærkværdige 

 Dyr har jeg søgt at undgaa, omendskjønt det vistnok havde 

 været det systematisk korrekteste; thi naar Hovedkarakte- 

 ren for Klassen Coelenterata mangler, naar der nemlig 

 intet Coelenteron er, har unægtelig Klassen tabt sin privi- 

 legerede Ret til at bemægtige sig disse Dyr. 



Af de indsamlede Aetinida ere der 18 nye Slægter 

 og 40 nye Arter, hvilke ere henførte til 15 Familier, 

 hvoraf 5 ere nye. 



Bergen, December 1888. 



D. C. Danielssen. 



logical investigation of the Actiniaria than has yet tåken 

 plaee is necessary. 



R. Hertwig says: „ Although the existing systems of 

 the Actiniæ undeniably require a complete remodelling on 

 a new foundation, I have refrained from this at present, 

 as the material investigated by me was insufficient. I 

 only considered it absolutely needful to form some larger 

 divisions anew in order to expi'ess in some measure the 

 eonditions of relationship among the forms. I have tåken 

 the structure and arrangement of the septa as the funda- 

 mental principle, and distinguish six Tribes of Actinaria: 

 1. Hexactiniæ; 2. Paractiniæ; 3. Monauleæ; 4. Edwardsiæ; 

 5. Zoantheæ; (i. Ceriantheæ." 



1 have been enabled to assign the Actinaria found 

 on the Norwegian North Atlantic Expedition to 4 of the 

 races i Tribus) above named, but I have been able, further, 

 to establish a new Tribus viz. Ægireæ, to which I have 

 relegated two genera that are really not Coelenterata, in 

 so far that they are furnished with a distinguished coelome. 

 I have endeavoured, however. to avoid forming an entirely 

 new class for those two most interesting animals; although 

 it would certainly have been the most systematically cor- 

 rect course to do so, because, when the chief eharacteristic 

 of the Coelenterata class is absent, when there is thus no 

 Coelenteron, the class has undeniably lost its elaim to 

 the privilege of acquiring those animals. 



Of the Aetinida collected. there are 18 new genera 

 and 4u new species, which are assigned to 15 families, of 

 which 5 are new ones. 



Bergen. December 1888. 



D. C Danielssen. 



