THE CAMPANULAEID^ AND THE BONNEVIELLID^. 63 



Gonosome. — Gonangia borne in the axils of the pedicels and also on the rootstocks, ob- 

 long ovate in general shape, with their distal ends abruptly truncated. Their walls are some- 

 times sinuous in outline but not regidarly annulated, and their pedicels usually show two an- 

 nulations. Gonangial contents, developing medusfe with 4 tentacles. 



Locality. — The type-locality is San Diego Bay, 3 fathoms, where they are found grow- 

 ing on sponges and algiB. This is the only known locality. 



Genus ORTHOPYXIS L. Agassiz (practieally=EUCOPELLA von Lendenfeld). 



Louis Agassiz uses Orihopyxis as a subgeneric name in his Contributions to the Natural 

 History of the United States/ where, under the name of Clytia (OrtJiojnjxis) poterium he gives an 

 elaborate description of what is now regarded as the well-known Clytia caliculata of authors. 

 He nowhere describes the subgenus Orihopyxis, but raises the name to generic rank on page 

 355 of the same work. 



His son, Alexander Agassiz, followed him in this, usmg the name Orihopyxis poterium, as 

 his father did, for the Clytia caliculata of authors.^ 



Neither of these authorities gave any description whatever to the genus, or subgenus, 

 Orihopyxis, but the older Agassiz very carefully described and illustrated the type-species. 



I can not find that any author has used the name Orihopyxis since 1865. Von Lendenfeld, 

 in. 1885,^ proposed the generic name Eucopella to acconmiodate a species which he very elabo- 

 rately described and figm-ed under the name Eucopella campanularia. 



This species, which he makes the type of the genus Eucopella, agrees entirely with Clytia 

 caliculata of authors in the remarkable thickening of the hydrothecal walls, but not in the 

 bilateral symmetry of at least part of the hydrothecse. Indeed there is a strong suspicion that 

 von Lendenfeld's Eucopella campanularia is identical with Clytia caliculata. 



Von Lendeiaf eld's generic description of his Eucopella is as foUows: 

 Die Polypstocke bestehen aus einen Hydrorhiza, von welcher unverzweigt Hyrocauli abgehen. Die Nalirpoljrpen 

 ■warden von bedberformigen Hydrotheken umschlossen. Die medusen sprossen an verzweigten Polypstylen. 



It seems evident that the law of priority demands that the genus Orthopyxis of Agassiz 

 should stand, and that the genus Eucopella of von Lendenfeld should be abandoned.* 



It seems to the present wi-iter that the thickening of the hydrothecal walls in this and 

 allied forms is a good generic character. The fact that individual hydrothecse in several species 

 do not show this character does not necessarily miUtate against this view, as they are ordinarily 

 thickened when mature and the thin walls of some individual ones may be regarded as a devel- 

 opmental featm-e, or as one due to certain imfavorable conditions. The fact that typical 

 calyces in these species are enormously thickened, a character not found in normal hydrothecse 

 of other species of Clytia, renders this character in the opinion of the writer available in generic 

 definition. The foUowiag definition is here adopted for this genus: 



Trophosome. — Colony consisting of unbranched pedicels springing from a creeping root- 

 stock. Pedicels, rootstocks and hydrothecse usually greatly thickened so that the cavity of the 

 latter is greatly decreased. 



Gonosome. — Gonangia ovoid or compressed, not gi'eatly lengthened and attenuated. 

 Medusse borne on branched blastostyles and without tentacles or manubrium. 



The type-species of this genus is Orthopyxis caliculata (Hiacks). 



1 Volume 4, 1862, p. 297. 

 = Nortb Amer. Acalephse, 1865, p. 81. 

 ' Zeitsch. Wissensch. Zool., vol. 5, 1885, p. 658. 



* In a private letter Dr. W. M. Bale, the well-known writer on Australian hydroids, strongly urges the correct- 

 ness of this view. 



