WEST COAST HYDEOIDS 29 



laridffi and Plumularidie, chiefly because there has been no mono- 

 graphic work of recent date except for these families, and in fact 

 as far as American forms are concerned, there has never been 

 such a work. Since this is the case there has been much diver- 

 sity in classification, though the majority of authors have fol- 

 lowed more or less closely, the classification used by Hincks in his 

 classic work on hydroids*. This I shall do also, though in doing 

 so, I must of necessity difi^er with some authors in some respects, 

 since there is this diversity. 



In the Sertularidae and Plumularidie, as later stated, I have 

 used as a basis Prof. Nutting's classification as given in his ]Mono- 

 graph of American Hydroids, Volumes I and II. We must look 

 forward to the time when the third volume, at which he is now 

 working, will help to clear up some of the difficulties in the 

 Campanularian species, as well. 



The constant features of the Calyptoblastea are these : 

 Hydroids in which the hydranths are protected by hydro- 

 thecae and the gonophores by gonothecse. 



CAMPANULARID.E 



Trophosome. — Hydrothecje campanulate, pedicellate, non-oper- 

 culate. A septum, which partly shuts off the hydrothecal cavity 

 from the cavity of the stem, is present in each. Hydranth with a 

 long trumpet-shaped proboscis, and a single row of filiform 

 tentacles. 



Gonosome. — Gonophores producing planulfe or free medusae. 



In this family the trophosome affords no features of much 

 taxonomic value, thus the gonosome is the main basis for classi- 

 fication into genera. Specific differences appear in both tropho- 

 some and gonosome. 



Genus CAMPANULARIA 



Trophosome. — Colony unbranched or regularly branched; stem 

 simple or fascicled; hydrotheca campanulate. 



Gonosome. — Gonophores containing fixed sporosacs from which 

 planuljB are produced. 



CAMPAXULARIA DENTICULATA Clark 



Campamilaria denticulafa Clark, Alaskan Hydroids, 1876, p. 213. 



Campanularia dentieuJata Xuttixg, Hydroids of the Harriman Ex. 1001/ 

 p. 171. 



*Brit!sb Hydroid Zoophytes, 1S68. 



