150 



DEPARTMEyT OF THE yiVAL SERVICE 

 Family TUBULARID.^. 



Trophosome. Sttnn unbranched or irregTilarly branched; perisarc definite; 

 hydranths witli a distal and a proximal set of filiform tentacles. 

 Gonosome. Gonophores producing actinulse. 



Genus Tubularia. 



Trophosome. Stem unbranched or irregularly branched; proximal set of ten- 

 tacles longer than the distal set, each set in one whorl. 



Gonosome. Gonophores in clusters, attached by means of stalked peduncles to 

 the body of the hydranth just distal to the proximal tentacles; female gonophores 

 producing actinulfe. 



KEY TO SPECIES. 



a Perisarc extensively annulated. 



aa Perisarc not extensively annulated. 



b Stems unbranched 

 c Stems jointed. 

 cc Stems not jointed. 



T. larynx. 



T. couth oiiyu 

 T. indivisa. 



hh Stem irr^ularly branched. 



d Medusoids with laterally compressed apical processes. T. crocea, 

 dd IMedusoids with conical apical processes, 



e Hydranths large T. specfahilis. 



ee Hydranths small. ' T. tenella. 



Tubularia couthouyi Agassiz. 



Trophosome. Stem unbranched, height 15 

 cm.; deep annulations at intervals dividing 

 the stem; hydranth large, 3 or 4 cm. in dia- 

 meter when tentacles are extended; proximal 

 tentacles 30-40, long; distal up to 50, shorter 

 and smaller. 



Gonosome. Gonophores growing in dense 

 racemes; sporosacs with 4 radial canals but 

 without apical processes. 



No. 21. 

 Tubularia covthouyi. 



