AN UNDESCRIBED HYDROID. 253 



first. In the type specimens no free medusae were present, though 

 there were numerous buds approaching full development. The 

 umbrella is distinctly bell-shaped, with four radial canals ; tenta- 

 cles unequally developed, two on opposite sides large and club- 

 shaped, the intermediate pair small and bud-like. No ocelli 

 distinguishable. 



Colors. Formalin material pale yellowish, hydranths some- 

 what brownish ; gonophores reddish brown or pink. 



Habitat. Growing in tufts upon small rock fragments, bits 

 of bark or on shelly concretions ; the bases of stems tangled or 

 enmeshed in sponge-like masses, the tufts and spicules of which 

 give to the colonies a rough and bristly aspect. 



