HTDROIDS OF EASTERN CANADA 

 Genus Clava. 



141 



Trophosome. Zooids rising singly from a reticular stolon; tentacles numerous, 

 scattered, filiform; proboscis clavate. 



Gonosome. Gonophores produce fixed sporosacs in clusters a short distance below 

 the proximal tentacles. 



Clava leptostyla Agassiz. 



Trophosome. Zooids clustered, 1 cm. in height, 

 constricted at the base; proboscis clavate, tentacles 

 20-30. 



Gonosome. Sporosacs spherical, appearing in large 

 clusters just below the proximal tentacles. 



No. 2. 

 Clava leptoslyla. 



Family LARID^. 



Trophosome. Zooids rising singly from a reticular stolon; tentacles much reduced 

 in number, very extensile; proboscis fusiform. 



Gonosome. Gonophores producing free medusae. 



Genus Monobrachium. 



Trophosome. Zooids, each with a single tentacle which has great freedom of 

 movement; mouth terminal. 



Gonosome. Medusa buds grow from the stolon; medusae with four radial canals. 



Monohrachium parasitum Mereschkowsky. 



Trophosome. Stolon growing over living mollusc 

 shells; the zooids appear at the hinge of the shell and 

 the network spreads over the surface to the margin, 

 with a number of free ends 3upi)lied with batteries of 

 thread cells, projecting beyond it; proboscis about 

 one-third the length of the whole zooid; tentacle when 

 extended longer than the body of the zooid; zooid 0-Y 

 or 0-8 mm. long, tentacle extended 1 mm. 



Gonosome. Gonophores grow on short pedicels 

 from stolon, one medusa bud to each gonophore; 

 medusa gloibular, with four radial canals. 



No. 3. 



ilonobrachium parasitum. 



