WEST COAST HYDEOIDS S'S 



California (Clark) ; VaneouTer Island (Allman) ; Berg Inlet, 

 Popoff Islands (Nutting) ; San Pedro and Santa Cruz, Cal. 

 (Torrey) ; Catalina Island (Torrey) ; San Juan Archipelago, 

 Port Renfrew, Ucluelet, Dodd's Narrows, Hope Island. 



This species seems as •\\-idely distributed in the Vancouver Is- 

 land and Puget Sound region as Aglaophenia struthionides, but 

 ^s it grows in masses that are much less conspicuous, it may not 

 be so often found as that species is. The majority of the colonies 

 correspond to Allman 's t^-pe, but many of them are somewhat 

 similar to Torrey "s variety sepiifera, but more nearly to that 

 t^-pe with the variations described by Ritchie."'^ I find as he does, 

 that though many of the intermediate internodes have but one 

 intrathecal ridge, some of them have two. Certain specimens 

 have two or even three athecate internodes at the base of the 

 hydrocladium, between the process that supports the hydrocla- 

 dium and the first thecate internode, each having a single intra- 

 thecal ridge. Occasionally there is more than one intermediate 

 internode between two thecate internodes on the hydrocladium. 

 Torrey states that in his specimens the hydrocladia coming out 

 on the opposite sides of the stem, are in the same plane. I do 

 not fijid this the case in any specimen. In all cases they come out 

 at an angle of from 100° to 120°, as they do in the regular lagen- 

 ifera tv'pe. Ritchie makes no reference to this and his drawing 

 does not make the matter clear. If this characteristic is constant 

 in Torrey 's specimens and the other points that he mentions are 

 always as definite as he says, they would seem to be of specific 

 value. Since I have not found them constant, even in the same 

 specimen, I have included all of them under P. lagenifera. These 

 short forms, however, are worthy of reference on account of the 

 sharp definition of the intrathecal ridges. ^Marktanner-Turner- 

 etscher has shown this very well in his drawing of P. californica, 

 as he calls it. In the larger specimens the ridges are not nearly 

 so distinct. These short forms have gonangia present, but they 

 are more like the gonangia of P. sctacea, quite small in cross- 

 section as compared with the ty^e. 



PLUMULAKIA MEGALOCEPHALA Allman 



PlumuJaria megalocepliala Allman, Mem. Mus. Comp. Zool., V. No. 2, 

 1877, p. 31. 



"0 Supplementary report on the Hydroids of the Scottish National Antarc- 

 tic Expedition, 1909, p. 87. 



