CERIANTHARIA. ^j 



Type: Pacliyccrianthus benedcni Roulc. 



Genus 2. Crrianfhiis delle Chiaje s. str. 



Ceriaiithidae whose 2nd couple of protocnemes are long, fertile and provided witli a small 



region of the cnido-glandular tract. Arrangement of the metacnemcs in each quartette Af, By w, b 



more or less distinct. M diminishing in length towards the midtiplication chamber, occasionally with 



some jjreaks in this diminution. 



Type: Crriaiifhus viciubraiiaccus Spall. 



Gentis 3. Cerianthfopsis nov. gen. 



Cerianthidae, whose 2nd couple of protocnemes are long, fertile and provided with a very 



small region of the cnido-glandular tract. Arrangement of metacnemes in each quartette in, 13. Af. b 



more or less distinct. M increasing in length towards the multiplication chamber, with (or without?) 



some breaks in this increase. 



Type: Crrianfhropsis aincricanns (Verrill). 

 Larval genera: Solasteractis E. van Beueden. 

 lApiacfis E. van Beneden. 

 } Prponacfis E. van Beneden. 

 Family 2 Acontiferidac^). 

 Ceriantharia with acontium-like threads from the cra.spedion region, who.se ectoderm chiefly 

 consists of mucus cells, on two or more mesenteries. 



Genus 4. Arac/niaiitJiiis nov. gen. 

 Acoutiferidae whose 2nd couple of protocnemes are comparativeh' short and sterile. Metacnemes 

 of the 1st and 2nd cycles (Al. in) without region of the cnido-glandular tract but with "acontia" on 

 the best developed. Arrangement of metacnemes in each quartette Af, B, in, b more or less distinct 



Type: Araciniaiithus oligopodus (Cerfontaine). 

 Larval genera: Arackiiaciis-) M. Sar.s. 



07'ac/is E. van Beneden. 

 Dactylactis E. van Beneden. 

 lApiacfis E. van Beneden. 

 1 Pcponactis E. van Beneden. 

 Famil)- 3. Botrucnidifcridac. 

 Ceriantharia with cuidorages mostly aggregated in botrncnidae; without '-acontia". 



I) This name ought properly to be replaced by another, since, as I have shewn below, the "acontia"' of the Cen- 

 antharia do not answer to the "acoutia" of the Actiniaria. 



'I Mc. Murrich is probably right in his view <L\\a.t Arachnactis hourm-i and A. brachiolala nuist be removed from the 

 genus Arcnhmul/s. If the first is the larval form of Cenanthus lloydii, which is extremely likel\-, it naturally cannot retain its 

 place under the family Acontiferidae. fnfortunately the known larval stages of this specie.s are all so early that "acontia", 

 even if they do appear eventually, have not had time to form. For the oldest larval stage obsers'ed by me had only 5 couples 

 of mesenteries only 3 of which possessed filamtnts. The couple on which "acontia" ought to appear, if such really do form, 

 had only feebly developed filaments. The classification of A. bounici remains therefore for the present uncertain. The same 

 holds true also of A. brachiolata. 



6 



The Danish Ingolt-Expeditioii \. 3. 



