CouGHTREY. — Notes 071 the New Zealand Hydroidese. 285 



^^ Habitat. — Lyall Bay (F.W.H.), on shells, etc., abundant." Very widely 

 distributed. (M.C.) 



The gonangia of this species are variable as regards the teeth. Some have 

 no teeth, others have asymmetrical teeth — thus the tooth will be well 

 developed on one side, whilst on the opposite it will be simply a slight 

 mammilloid elevation; others again have well marked teeth. Figs. 16, 17, 

 and 19. 



Sertularia abietinoides, Hutton. 



Dynamene abietinoides, Gray. 



" Hydrophyton erect. Hydrocaulis pinnately branched; pale brown. 

 Hydrothecse crowded, sub-opposite, tubular, slightly incurved ; aperture 

 surrounded with about five acute teeth. Gonangia urceolate, smooth, with 

 a long blunt process (tooth) on each side at the top. 



^^ Habitat. — Lyall Bay (F.W.H.) Abundant." Very widely distributed j 

 attached to sponges, stones, shells, and peduncles oi Boltenias. (M.C.) 



To this excellent description I would add : — The hydrorhiza consists of an 

 open fibrous network which spreads itself over the object to which hydro- 

 phyton is attached, and gives off from its upper surface the branches whose 

 general appearance is like a bunch of open feathers. The gonangia are 

 generally found in clusters at the lower part of the branches. In some 

 specimens the branches throughout are short and simply pinnate, in others 

 they are long and bipinnately divided ; in the latter the hydrophyton has a 

 lax and pretty appearance. 



Apertures of hydrothecse generally average six teeth. (Figs. 18 — 20, 

 and 16.) 



Sertida/ria fusiformis, Hutton, loo. cit. 



" Hydrophyton lax. Hydrocaulis simple or sparingly branched, rather 

 large. Hydrothecse alternate, rather close, long ; aperture obliquely truncated, 

 and with two round teeth on outer side. Gonangia fusiform, large, smooth, 

 pointed at the apex." 



I would add to the above :^Hydrothec8e with tumid inverted lips. 

 Gonangia with a marked spathulate bar or crest along its outer side. 



Habitat. — Lyall Bay. On Fuci very common. (F.W.H.) Figs. 21 — 23. 



Genus Synthecium, Allman. 



Chief generic characters. — Hydrothecse sessile and opposite or decussate, 

 inner faces of each pair nearly joined together, being only separated by a thin 

 film of csenosarc, a marked joint between each pair. 



This genus was founded by Professor Allman on a remarkable specimen 

 in Mr. Busk's collection, and this specimen he named Synthecium elegaiis. I 

 prefer at present to give Professor Allman's own words : — 



