WEST COAST HYDEOIDS 67 



land, 23 fathoms (Kirchenpauer) ; Albatross Station 3558, N. 

 56° 58', W. 170° 09', 25 fathoms (Nutting) ; San Juan Archi- 

 pelago, Queen Charlotte Islands. 



SELAGINOPSIS PLUMITOEMIS Nutting 



Selaginopsis plurniformis Xuttixg, American Hydroids, Part II, 1904, 

 p. 129. 



PSelaginopsis cylindrica Clakk, Alaskan Hydroids, 1876, p. 226. 



Distribution.— N. 60° 22', W. 168° 45' (Nutting). 



I have not been able to satisfy myself that this species is dis- 

 tinct from S. cylindrica Clark, as I have found a number of speci- 

 mens of what I take to be S. cylindrica, with a woody main stem 

 and large primary branches, Mith secondary branches, similar to 

 Prof. Nutting's type specimen. It appears that the reason that 

 they are not often found in this way is, that the primary branches 

 break off from the main stem, taking the annulated portion with 

 the branch. Consequent!}^ what appears as a main stem in an 

 ordinary specimen, is really a primary branch, and what appears 

 as a primary branch is really a secondary branch. This would 

 explain what Clark says, "occasionally a large branch occurs 

 which resembles the main stem in every particular ".^° With re- 

 gard to the branching he says, "branches, cylindrical or polyg- 

 onal, arranged alternately, bearing from one to three branchlets 

 near the base, which are of equal size and of nearly equal length 

 with the branches, or unbranched". I have found that this ac- 

 curately describes the specimens that I have examined. This 

 branching of the branches gives a close resemblance to ]\Ieresch- 

 kowsky's figure of S. pacifica,^'^ corresponding to the agreement 

 Prof. Nutting finds between S. plumiformis and S. pacifica. 



SELAGINOPSIS TEISEEIALIS Mereschkowsky 



Selaginopsis tri-serialis Mereschkowsky, Ann. and Mag., Sth Ser., II, 

 1878, p. 435. 



Selaginopsis triserialis Kirchenpauer, Nordische Gattungen, 1884, p. 14 

 Sertularia incongrua Torrey, Hydroida of the Pacific Coast, 1902, p. 69. 

 Selaginopsis triserialis Nutting, American Hydroids, Part II, 1904, p. 129. 



Distribution. — San Pedro, Cal. (Torrey) ; Albatross Station 

 2908, N. 34° 25' 25", W. 120° 20', 31 fathoms (Nutting). 



50 Alaskan Hydroids, 1876, p. 227. 



51 Ann. and Mag., Vol. 2, oth Ser., 1878, PI. 16, fig. 5. 



