WEST COAST HYDEOIDS 35 



found imbranclied or but slightly branched, in some cases the 

 branching is cpite extensive though irregular, and the whole col- 

 ony may reach the height of an inch. In the former case the 

 stolon is spread widely over the surface of Fucus and is much 

 anastomosed. When the stem is unbranched the pedicels vary in 

 length, are generally annulated for some distance at the base and 

 below the calyx, or they may be annulated throughout the great- 

 er part of their length. When forms appear with only one 

 branch, this branch is usually much longer than the remainder 

 of the main stem, is annulated similarly and has a distinct flex- 

 ure near its origin, so that it passes out often closely applied to 

 the main stem as shown in Nutting's figure.® The hydrothecae 

 vary much in size but in all cases the typical shape is fairly well 

 retained. Torrey refers to this difference in size^ and gives meas- 

 urements to verify. 



The simple forms resemble Clijtia johnstoni Alder, but the 

 teeth in the hydrothecae are relatively longer and much more 

 slender than in that species. The resemblance is carried farther 

 than the trophosome as the gonosomes are quite similar. In both 

 they have their origin either from the stolon or from the pedicel 

 and they are strongly annulated. In the branched forms the 

 calyces are usually much larger, but apart from this each branch 

 corresponds to a simple form. The gonangia appear in the axils, 

 or they may appear anywhere along the stem. They vary much 

 in size and the number of their rings, which may be as few as 

 five or as many as twelve. These branched forms correspond to 

 those found by Torrey and Nutting but as they found no gono- 

 some the species was supposed to belong to the genus Campanu- 

 laria. 



Apparently this is the form which Calkins has described as 

 Campanularia gracilis, supposing it to be the same as Gonotliyrcea 

 gracilis Allman. The trophosomes of the two are much alike, but 

 the extra-capsular gonosome of Gonotliyraia gracilis is very dif- 

 ferent from that figured h\ him,^° this evidently being a Clytia. 



CLYTIA HENDEESONI Torrey 

 Clytia hendersoiii Torrey, Hydroids of San Diego, 1904, p. 16. 



sHydroids of the Wood's Hole Region, 1901. p. 3-46. 



9 Hydroids of San Diego. 1904. p. 11. 



10 Some Hydroids of Puget Sound, 1899, p. 350, PI. 2, Fig. 10. 



