140 PROF. ALLMAN ON NEW HTDEOIDA FEOM 



cauline side, and then diverging at an acute angle ; orifice very 

 oblique, directed tow^ards tlie internode, and with its apocauline 

 edge deeply cleft. 



Gonosome. — Gronangia springing each by a short peduncle 

 from the side of the internode at a point just below a pair of 

 hydrothecse, oboviform, with the summit extended into a short 

 wide tube which opens by a circular orifice. 



Locality. Tauranga, JS"ew Zealand, collected by Dr. Davies. 



Sertularia crinis, though attaining a height of upwards of 

 7 inches, is a very delicate and flexile specieB= The chitinous 

 periderm is thin and transparent, and the whole colony is destitute 

 of the rigidity so usual among the Sertularian hydroids. It comes 

 very near to Sertularia hispinosa, Gray, from which it differs in 

 its more ovate gonangia without angular processes. 



Seetulaeia elongata, Lamx. (PI. XY. figs. 1-6.) 



Trophosome. — Stem slender, monosiphonic, sparingly branched, 

 carrying along nearly its eutire length alternately disposed 

 closely-set pinnae. Hydrothecse subopposite, carried both by the 

 pinnae and the main stems, tubuliform, adnate to the internode 

 for about half their height, free and divergent for the remainder, 

 with the summit slightly curved towards the internode ; orifice 

 with six long-pointed teeth, the two teeth at the epicauline side 

 of the orifice separated by a wide interval ; portion of internode 

 between each pair of hydrothecse much contracted. 



Gonosome. — Gonangia springing each almost exclusively from 

 an internode of the main stem, obconical, smooth, opening on the 

 summit by a slightly elevated rather wide orifice, on each side of 

 which the walls of the gonangium are continued into a long 

 strong horn-like spine. 



Locality. Tasmania. 



Sertularia elongata is a very elegant plume-like species, 

 attaining a height of about 4 inches, and with much of the 

 habit of a Plumularian. Its tubuliform hydrothecse with their 

 long marginal teeth, and its large horned gonangia aflFord obvious 

 and striking characters. 



A form from "West Australia, difi"ering slightly from that here 

 described, is also contained in Miss Gatty's collection. Its 

 gonangia, instead of being almost exclusively confined to the main 

 stem, are all seated on the pinnse, each pinna carrying usually a 

 single gonangium. The imperfect partition between the cavity 

 of the liydrotheca and that of the internode is here thick and of 



