Dr. ]\[. Coughtrey on New-Zealand Hydroida. 27 



SertulareUa suhpinnata and Sertularella delicatula^ Hutton, 



loc. cit. 



I still believe these two species to be varieties of S. John- 

 stonii] and I have made fresh examinations of them. 



Sertularella simplex^ Hutton, loc. cit. ; Coughtrey, loc. cit. 

 p. 283, pi. XX. 



In my paper to the New- Zealand Institute I expressed an 

 opinion that S. simplex of Hutton was the New-Zealand 

 representative of S. polyzonias of Linna3us ; and I grouped 

 along with Hutton's species several pygmy varieties in which 

 the hydrothec^e were transversely wrinkled. In this I was 

 wrong ; and I would now regard Capt. Hutton's species as 

 a distinct one, approaching nearest to SertulareUa fusiformis 

 of Hincks ; while the transversely \VTinkled variety (pi. xx. 

 tig. 9, loc. cit.) is an intermediate form between S. rugosa and 

 *S'. tenella, British species, but approaching nearest to the 

 latter; and the large one with the denticles (fig. 10, loc. cit.), 

 together with the form figured in the present paper, I believe 

 to present other and distinct characters to form a separate 

 species, for which I would propose the name of Sertularella 

 rohusta (PI. III. figs. 6 a, J, c). 



In habit S. rohusta resembles S. geniculata, Hincks (Ann. 

 & Mag. Nat. Hist. ser. 4, vol. xiii. p. 152), or, again, the 

 specimen of S. polyzonias obtained by Sars from the North 

 Cape (' British Zoophytes '). The two most robust speci- 

 mens I have gathered were both from the southern coasts, — 

 one from the shell of Iraperator imperialis, got in the 

 Foreaux- Straits oyster-bank ; the other from the rootlets of 

 a large Laminarian that had been washed ashore on the 

 Ocean Beach, Dunedin. I think it right to mention that of 

 all the specimens I have gathered belonging to the S. poly- 

 zonias group, those from the east coast are considerably 

 smaller than those got on the southern coast. This differ- 

 ence in size accords well with what is seen in the same type 

 in the northern hemisphere. 



Genus Sertularia, Linnaeus (in part), Hincks, Brit. Hydr. 



Zooph. 



Sertularia bispinosa, Hutton, loc. cit., and Coughtrey, loc. cit. 

 p. 284, pi. XX. fig. 17. 



Dynamenc bispinosa, Gray. 



Mr. Busk, when reporting on the Sertularian Zoophytes 



