262 *S'. F. Clark — Uydrolds of the Pacific Coast. 



Aglaophenia struthionides Clark (Murray). 



Flumulari'i stridhmmles Murray. Ann. and Mag. of Nat. Hist, for April, 1870, 251, 



Plate XII, fig. 2. 

 Arjlanphenia franciscana A. Agassiz, Cat. N. A. Acalephai, p. 140, 1865. 



Plate XLI, figures 3-3''. 



Stems rooted by a creeping stolon, simple, erect or spreading in 

 every direction, divided by slightly oblique joints into very short 

 internodes of equal length, each bearing a single pinna, varying 

 from the lightest to the darkest horn-color; shoots tall, stout, plumose, 

 tapering slightly toward the base, the distal end abruptly pointed ; 

 pinna' slightly curved, sub-erect, unbranched, not in the same plane, 

 the sides bearing the hydrothecie curving toward each other, divided 

 into short internodes by slightly oblique joints, each internode bear- 

 ing a single hydrotheca. Hydrotheca^ large, cu}>shaped, expanding 

 toward the distal end, aperture large, patulous, rim denticulated, 

 armed usually with eleven, sometimes nine, sharp, uneven teeth. 

 Nematophores tubular, the lateral ones of medium size, projecting 

 ear-like from the sides of the hydrothecae, the anterior one long, 

 adnate for the greater part of its length, free near the distal end, 

 extending nearly or quite to the edge of the toothed rim, aperture 

 small, discoidal, terminal ; those upon the corbula3 are a trifle larger 

 than the lateral ones and are arranged in transverse rows, the ends 

 of which do not meet. Corbuhe large, cylindrical, with numerous 

 rido-es (ten to sixteen) composed of oblique rows of nematophores ; 

 usually from two to six hydrotheca? at the base of the corbula. In 

 luxurious specimens the corbula- are very abundant, there being 

 between seventy and eighty t)n a single shoot. Length of largest 

 specimen, 150"""" 



Bay of San Francisco,- -Trask ; San Francisco, Cal.,— A. Agassiz; 

 Santa Barbara, Cal.,— L. F. Dimmick ; Santa Barbara, Cal.,— Mrs. 

 EUwood Cooper ; Santa Cruz, Cal., Bay of Monterey, — C. W. Ander- 

 son* San Diego, Cal.,— D. C. Cleveland; Vancouver Ishmd, — Miss 

 Mitchell ; Vancouver Island, — J. M. Dawson. 



In the various lots of Hydroids which we have received from the 

 western coast, this species has always been the most abundant. It 

 seems to be as common and as widely disti'ibuted on the western 

 coast of the United States as tSertularia puniila is upon the eastern 

 coast. Both are also very often found parasitic on algiie, but A. stru- 

 thionide-s is often found in deeper water than N. pui/td-a. 



