Barr.—H ydroids from the New Zealand Coast. 251 
Loc.—Torres Strait (Busk): near Port Jackson (Bale, Allman): Tahiti 
(Jàderholm) : Auckland (Marktanner-Turneretscher): Ternate (Campen- 
hausen): ? Japan (Inaba, Stechow, Jàderholm). 
Synthecium elegans Allman. 
Synthecium elegans Allman, 1872, p. 229 ; 1876, p. 266: Coughtrey, 1874, p. 285 : 
Farquhar, 1896, p. 465: Hilgendorf, 1897, p. 211; 191}, p. 541: Hartlaub, 
1901, p. 368: Billard, 1910, p. 25. 
Sertularia elegans Coughtrey, 1875, p. 301; 1876, p. 29. 
Synthecium ramosum Allman, 1885, p. 137: Billard, 1907a, p. 359. 
A single specimen from Professor Chilton differs from Allman's figure 
in having at least the first pair of hydrothecae on the pinnae subalternate 
instead of exactly opposite; also in having apertures of hydrothecae not 
quite at right angles, but slightly approaching the vertical. 
he locality is unknown;  Hartlaub's specimens were from French 
Pass, Hilgendorf's from Dunedin. ^ 
Hilgendorf’s remark anent “the close approximation of the opposite 
hydrothecae which gave the genus its name" is based on a misunder- 
standing, as the generic name applies solely to the fact that peduncles of 
 gonangia spring from within the cavity of some of the hydrothecae; more- 
over, opposite hydrothecae in Synthecium are not closely approximate. 
Allman considered that the peculiarity on which he founded the genus 
was witbout parallel in any other group of hydroids, but it is now known 
occur as an occasional feature in various hydroids—e.g., Obelia geniculata, 
Sertularella polyzonias, &c. 
Stereotheca zelandica (Gray). | 
' Thuiaria zelandica Farquhar, 1896, p. 464: Billard, 1910, p. 15 (synonymy). 
Thuiaria dolichocarpa Allman, 1876, p. 270. | 
? Thuiaria hippisleyana Allman, 1885, p. 146. 
llman's magnified figure of T. dolichocarpa is quite sufficient for 
with a gonangium. So far as I can judge therefrom, the species seems 
to share with S. acanthostoma the very rare character of having both sides 
of polypidom exactly alike; hydrothecae being no nearer to those opposite 
them on one side than on the other, and teeth also being symmetrical on 
the two sides. i 
If there is an operculum I am unable to trace it in this specimen ; 
probably, as in the other species with numerous teeth, it is inoperculate, 
and therefore to be referred to Stereot 
"he pinnae are not, as stated, without nodes; in this instance there 
is one long internode and two or three short ones. 
The addition of T. hippisleyana to synonyms recorded by Farquhar 
the peculiar features said to characterize T. hippisleyana. 
