256 S. P. Clark — Itydroids of the Pacific Coast 



tinctly sinuous outline. Gonothecse unknown. Height of largest 

 specimen, 75"'"'. Plentiful on a large species of Mytilus from Mon- 

 terey, Tomales Pt., Punta Reyes, and on old shells, Bay of San Fran- 

 cisco (Dr. Trask) ; Santa Cruz, — Dr. Anderson; Vancouver Island, 

 — J. M, Dawson. 



Our specimens of S. anguina agree so closely with Hinck's descrip- 

 tion and figures of S. filicula that I cannot separate the trophosomes, 

 but the gonosomes being unknown, I prefer to let the species remain 

 distinct rather than to unite them on such incomplete data. Murray 

 also noticed the similarity to *S'. filicula although he only possessed 

 " a minute portion without vesicles." 



Dr. Trask says of his specimens, " Their affinity is witli that of 8. 

 fallax of Johnston more nearly than with any other species with 

 which I am acquainted." He could not have known (^f ^i. filicula at 

 that time or he would at once have noticed the much closer resem- 

 blance to that form. Pie also says that his specimens have four 

 hydrothecie between each pair of branchlets, while ours have but 

 three: one pair opposite each othei- and one odd cell in the axil of the 

 branch. His description and figure agree so well, however, in evei'y 

 other respect that I am inclined to regard this as an error of observa- 

 tion. 



This description has been made from specimens which were dried 

 before they were sent to iis and have since been soaked out in warm 

 water. The perisarc being very stout and durable I do not think 

 that it can have changed to any great extent. 



Sertularia anguina, variety robusta Clark. 

 Plate XL, figures 3, 4, 5. 



The variety robusta differs from the ordinary form in having a stouter 

 stem, larger hydrotheca% longer pinnjie, and in being in every way a 

 much larger and stouter form. The mode of growth, the branching, 

 the shape and arrangement of the hydrothecae are the same as in the 

 normal form. Gonothecae borne on the pinnae, more or less fusiform, 

 arising from just below the hydrotheca^, distal extremity slightly 

 curved to one side, the terminal aperture, large, circulai'. Length of 

 largest specimens, 100""". 



San Diego, Cal., — Henry Hemphill ; taken from kelp roots washed 

 ashore during a storm. 



San Diego, Cal.,— D. C. Cleveland, 1875; Santa Cruz, Cal., Bay of 

 Monterey, — Dr. C. W. Anderson ; Vancouver Island, — J. M. Dawson. 



This variety is very similar to S. abietina of Linmeus in many 



