[fraser] HYDROIDS OF THE VANCOUVER ISLAND REGION 203 



struthionides. There is an aperture between the bases of adjacent 

 leaves, and no prominent spur at the bases. There are two hydro- 

 thecae between the corbula and the stem" (Nutting). 



Distribution — Puget Sound (Fraser). 



This species was reported in my previous paper from some of 

 Prof. Nutting's material. I have not found it elsewhere. The 

 description and the figures are from Nutting. 



Aglaophenia struthionides (Murray) 

 PI. XXXIV, Fig. 131 



Plumularia struthionides Murray, Ann. and Mag. N.H., 3rd ser., 5, 



1860, p. 251. 

 Aglaophenia struthionides Fraser, West Coast Hydroids, 1911, p. 80. 



Trophosome. — Colonies usually growing in large conspicuous 

 bunches, which may appear to view on the rocks at low tide. The 

 stems are usually unbranched but occasionally scattered branches 

 are given off, making a wide angle with the stem and apparently 

 loosely connected with it; the branch has the same appearance as 

 the main stem; the stem is divided into regular short internodes, 

 each of which bears a hydrocladium; the hydrocladia are regularly 

 alternate but those on the two sides do not come out in the same plane, 

 but converge to a considerable extent in the one direction; the hydro- 

 cladia are directed outward and slightly upward, they are regularly 

 graded in length to give the "ostrich-plume" effect; they are divided 

 into regular internodes, each of which bears a hydrotheca, which 

 occupies practically all the one side hence the hydrotheca^ are closely 

 approximated. Each hydrotheca has eleven teeth the odd one which 

 is farthest from the hydrocladium is pointed backward but the one 

 on each side of it is pointed forward, these three are quite sharp, 

 the remaining four on each side are much blunter and are quite 

 irregular; the intrathecal ridge is evident; the supracalycine nemato- 

 phores are large but do not overtop the hydrotheca; the mesial 

 nematophore is large the free portion varies much in length, but 

 seldom reaches much beyond the top of the hydrotheca; the cauline 

 nematophore at the base of the hydrocladium is large and triangular. 



Gonosome. — Corbulse on hydrocladia similar in position to other 

 hydrocladia, bearing three hydrothecae on proximal portion; cor- 

 bulae closed when mature, with as many as thirteen pairs of leaves, 

 each with a row of nematophores showing along the margin; there is 

 no pronounced process at the base of the leaves. 



Distribution. — Puget Sound (Dr. Steindachner) ; Townshend Bay 

 (Calkins) ; Puget Sound to San Diego (Torrey) ; San Juan Archipelago, 



