2G0 CAMPANICLAVA. 



TROPHOSOME. — Hydeanths about a line in height, scattered on the uydko- 

 RnizA, and with twelve or more tentacles. 



GONOSOME. — Umbrella of mature medusa mitrate ; marginal tentacles sixty or 

 more. 



Colour. — Hydranths and ovarian masses in the walls of the manubriuui bright crimson. 

 Habitat oi gonosome pelagic, of trophosome unknown. 



Locality (of gonosome), European seas. 



Observations are still needed for an adequate knowledge of the completely developed 

 tro})hosorae of this beautiful little iiydroid. The cUiated planula is of a fine crimson, and Gosse 

 traced its development as far as the production of a creeping stolon, and the formation of a 

 liydranth which he followed to the emission of its first four tentacles, while Wright, carrying his 

 observations further, saw the tentacles become multiplied to twelve, and noticed the production 

 of a chitinous perisarc on the stolon and rudimental stem. Beyond this, however, no observations 

 have been carried, and we as yet know nothing of the part of the trophosome from which the 

 gonophores are developed, nor of tlie condition of the medusas at the time of their liberation. 



Wright gave to the trophosome of Tunis nec/lecia the name of Clavula Gossii, a name, 

 however, which, in accordance with the principles which must regulate the nomenclature of the 

 Hydroida, has to yield to that long previously given to the medusa. 



CAMPANICLAVA, Allman. 



Name. — From Campaiia, a bell, and Clara, a genus of hydroids ; in allusion to the medusiforin 

 gonophores and the clavadike trophosome. 



Syncoryne, — Gccjenhaur. 



TROPHOSOME. — HTDEOPnTTON a creeping filiform hxdeouiiiza, invested by 

 a PERisAKc ; iiYDRocAULUs undeveloped. Hydranths claviform. 



GONOSOME. — GoNOPnoRES phanerocadonic, borne by the hydrorhiza ; umbrella 

 at the time of liberation deep beU-shaped ; manubrium destitute of oral tentacles ; 

 radiating canals four ; marginal tentacles tw'O, continuous with two opposite radiating 

 canals, and having bulbous bases without ocelli, two intervening smaller bulbs corre- 

 sponding with the terminations of the other two radiating canals in the circular 

 canal. 



The genus Cawpanidava has been constituted for a remarkable hydroid described by Gegen- 

 baur under the name of Syncoryne Clcodora, but which cannot be received into the genus Syn- 



