56 THE OCEANIC HYDROZOA. 



Gems VOGTIA (Kolliker). 



The nectocalyces are numerous, similar, and convex on their inner sides ; externally they 

 are concave, and produced into five points, of which the three upper are much longer and 

 stronger than the two lower. The nectosac is small and rounded. 



VoGTIA PENTACANTHA. PI. XII, fig. 7. 



Voffiia pentacantha, Kolliker, 1853. 



Only a single species of the genus Vogtia has been discovered, and we are indebted to 

 Professor Kolliker for all we know of its structure. Unfortunately, only two specimens passed 

 into that observer's hands, and hence his account is necessarily brief and incomplete. 



The nectocalyces, whose form has been described in defining the genus, are four or five 

 lines wide. Their arrangement upon the coenosarc has not been accurately determined, 

 but they formed a double opposed series with their convex faces turned towards one another. 



The coenosarc of Vogtia is like that of Hippopodius, but it is shorter and somewhat 

 thickened at the lower end, where it bears the polypites and the other organs. The polypites 

 were only two and large ; each had a tentacle similar to those of Hippopodius. Gonophores 

 of both sexes were borne by both specimens, and were attached by short peduncles to the 

 coenosarc close to each polypite — a single long gynophore being accompanied by two still 

 laro-er androphores. The gonocalyces are like those of Hippopodius, but shorter in proportion 

 to the long manubria. 



Vogtia has hitherto been observed only in the Mediterranean. 



