54 C. McLEAN FRASER 



holes in the shoulder indicate the places where they had been. 

 The hydrotheca widens gradually and symmetrically until it. 

 reaches the diaphragm. From this point the under surface 

 passes out almost in a straight line, while the upper surface is. 

 convex for some distance, after which it passes out parallel to 

 the lower side. The margin is but slightly flaring. It is com- 

 monly duplicated. 



Gonosome. — Unknown. 



Distribution. — San Juan Archipelago in Prof. Kincaid's Col- 

 lection. 



In some respects this species resembles Lictorella pinnata 

 (Sars), or Lictorella Jialecioides Allman, which I presume is the- 

 same thing. The hydrotheca especially resembles that figured by 

 Sars,-*' so much so that if I had not ^ad the opportunity of ex- 

 amining some fine specimens of L. pinnata from the Hawaiian Is- 

 lands, identified by Prof. Nutting,-'^ I should have hesitated in 

 placing the Puget Sound specimen in a new species. One of the 

 most marked differences is shown in the pronounced and regular 

 division into internodes, which is not present in the Hawaiian 

 Island forms, nor is it shown in any figures of L. pinnata that I 

 have seen. The tendency towards dichotomy in the arrangement 

 of the branches, and the presence of secondary branches, make 

 the appearance of the specimen quite different from the some- 

 what stiffly-pinnate arrangement found in L. pinnata. 



This species also resembles Zygophylax hiarmata Billard, as 

 described and figured by Billard,-^ differing from it in much the 

 same way as from L. pinnata. Whether this species of Billard 's 

 is the same as L. pinnata or not, it is not necessary to discuss. 



SERTULARID^ 



In taking up this family of Hydroids, I have followed the ex- 

 ample of the majority of those who have written since 1904 in 

 using as a basis, the classification given by Prof. C. C. Nutting 

 in his monograph of that year. 



Of his 12 genera I have found only 7 represented in the new 

 material I have examined, viz., Abietinaria, Diphasia, Eydrall- 

 mania, Selaginopsis, Sertularella, Sertularia and Thuiaria. To 



26 Bidrag til Kundskaben om Norges Hydroider, 1873, Tab. IV, figs. 27, 2S.. 



27 Hydroids of the Hawaiian Islands, 190.5, p. 946. 



28 Expeditions du Travailleur et du Talisman, 1907, p. 180. 



