154 THE ROYAL SOCIETY OF CANADA 



? Obelia multidentata new species 



PI. XVII, Fig. 56 



Trophosome. — Colony much branched; main stem and larger 

 branches show a tendency towards fasciculation ; branches given off 

 alternately with some degree of regularity, but they are not all in the 

 same plane; pedicels on the more distal branches usually short and 

 annulated throughout; extra pedicels often occur in the axils of the 

 shorter ones as well as in the axils of the branches, which are much 

 longer than the regular pedicels and annulated only at each end. 

 On the stem and branches there are 2 or 3 annulations above each node ; 

 hydrothecse large with numerous teeth, 20-24, that are very dis- 

 tinctly cut and either cut off squarely at the tip so that there are sharp 

 points where the end meets the sides, or they may be more rounded 

 so that the sharp points are not so noticeable; striae pass downward 

 from the margin at the bases of the cavities between the teeth. The 

 fluting is so distinct that it appears as though the hydrotheca were 

 made of separate segments, with adjacent margins turned inward 

 together. 



Gonosome. — Unknown. 



Color.— The color of the main stem and larger branches is dark 

 green almost black and the smaller branches a lighter green. 



Distribution. — -Friday Harbor. 



Obelia plicata Hincks 



PL XVII, Fig. 57 



Obelia plicata Hincks, Br. Hydroid Zoophytes, 1868, p. 159. 



Obelia plicata Marktanner-Turneretscher, Die Hydroiden des 



k.k. Nat. Hofmuseums, 1890, p. 208. 

 Obelia plicata Fraser, West Coast Hydroids, 1911, p. 39. 



Trophosome. — Stem fascicled; branches numerous, some of them 

 fascicled, at least in the proximal portion; stem and branches with 

 2 or 3 annulations above each of the nodes; pedicels long with several 

 annulations at each end, but there may be a shorter pedicel in the axil 

 of the longer and this is annulated throughout; hydrotheca campanu- 

 late, with slightly everted, entire margin. 



Gonosome. — I have not seen the gonosome and Hincks did not. 

 describe or figure it but Marktanner states that it is similar to that of 

 0. dichotoma. 



Distribution. — Puget Sound (Nutting); Puget Sound (Calkins); 

 Departure Bay, San Juan Archipelago (Fraser); Ft. Townshend. 



