262 PBOF. ALLMATS" OIST NEW GEXERA 



ramuli, each springing from a point just below a bj-drotlieca, 

 obovate, gradually contracting below into a short peduncle, ter- 

 minating above in a tubular orifice, which is situated excentrically 

 on the truncated summit, distinctly and closely annulated in its 

 entire length. 



Locality. New Zealand, Mr. Bush's collection. 



Mr. Coughtrey's amended description of the Sertularella John- 

 stoni of Graj renders it pretty certain that Gray's description was 

 intended to apply to the present species, and necessitates the sup- 

 pression of the specific name "■gracilis,''' under which I had origi- 

 nally described it, in favour of the name previously assigned to it by 

 Gray*. It is a delicate andvery elegant species, rendered obvious to 

 the naked eye by the tufts of long slender stems with their regu- 

 lar pinnately disposed ramuli. In the same collection is a form 

 difiering from that here described in the central position of its 

 less decidedly exserted gonangial orifice ; in all other respects it 

 is indistinguishable from it. I regard the difference as merely 

 varietal or possibly sexual. 



Sertularella INTEGRA. Plate XIII. figs. 3, 4. 



Trophosome. Hydrocaulus attaining a height of about an inch, 

 simple, or sparingly branched. Hydrothec8e adnate to each in- 

 ternode by somewhat more than a third of their height, slightly 

 swollen below, becoming gradually narrower towards the orifice, 

 marked upon the upper side with shallow annulations, orifice 

 destitute of teeth. 



Gonosome. Gonangia springing from a point just below the 

 base of a hydrotheca, ellipsoidal, marked in somewhat more than 

 the distal half by shallow annulations, terminating by a tubular 

 4-toothed orifice. 



Locality. New Zealand Mr. Bush's collection. 



The perfectly even rim of the hydrotheca, destitute of all trace 

 of teeth, is an obvious feature m this species. Just within the 

 orifice, upon the inferior walls of the hydrotheca, is a very distinct 



* The proof-sheets of the present paper were passing through my hands when, 

 by the kindness of Mr. Coughtrey, I received a copy of his " Notes on the New 

 Zealand Hydroidese," read before the Otago Institute, May 1874. The paper is 

 accompanied by figures, and amends in many important points the descriptions 

 already given by Gray (Catalogue in Driffenbach's ' New Zealand ') and by 

 Captain Hutton ("On the New Zealand Sertulai-ians," Trans. New Zeal. Inst, 

 vol. V. 1872). Without such figures and^ corrections it would, indeed, in many 

 cases be impossible to identify the species to which the descriptions of these 

 naturaUsts refer. 



