32 University of California Publications. [zoology. 



open ocean; the other has been found upon wharf piling on the 

 eastern shore of the bay, where the water is comparatively quiet, 

 usually muddy and brackish. The former has the more vigorous 

 appearance; the perisarcal tube is firm and is filled by the 

 coenosarc; the stems reach the height of an inch, and may 

 branch three or four times. The latter has a more delicate 

 perisare, from which the attenuated coenosarc has shrunk away. 

 The branching is not profuse, but the branches are longer and 

 are matted together in tangled masses not characteristic of the 

 other form. The colonies from the Bay entrance possessed 

 numerous medusa? Dec. 14, 1895. There were a few medusae on 

 colonies collected at West Berkeley (bay form) August, 1894. 



FAM. El'DEXDRIIDjE. 



Trophosome. Branching hydrocaulus, invested with perisare. Hydranths 

 more or less ovate with a single whorl of filiform tentacles; proboscis 

 abruptly differentiated from the body. 



Gonosome. Gonophores fixed sporosaes. 



The integrity of this family can no longer rest solely upon 

 the shape of the proboscis. In Hydractinia milleri the proboscis 

 represents a condition transitional between the conical and 

 trumpet shaped types. In combination, however, with the non- 

 fusiform hydranth and the branching hydrocaulus, the limits of 

 the family are still sufficiently well marked. 



Eudendrium. 



Trophosome. Same as for family. 



Gonosome. Male gonophores polythalamie, borne on body of hydranth in 

 a whorl proximal to tentacles. Female gonophores monothalamic, less 

 regularly distributed on hydranth body or stalk. 



Eudendrium calif ornicum, sp. nov. 



PI. II. Figs. 13, 14. 

 Trophosome. Stem stout, simple, reaching 140 mm. or more in length, 

 in clusters of 6 or 8 from an encrusting platelike hydrorhiza. Each ascends 

 in a very loose spiral, giving rise to branches at moderately frequent inter- 

 vals in all planes. These branches first bend away from the stem at a wide 

 angle, turning upward near the tip. The branches are usually less than 20 

 mm. long, of nearly the diameter of the stem and branching similarly, 

 though their branches (secondaries) tend to bend toward the distal end of 

 the colony. Hydranths, with 20-22 tentacles, borne on secondaries, though 

 oue fertile hydranth may appear at times near the base of a primary. Color 

 of hydranths flesh pink. 



