Barr.—Hydroids from the New Zealand Coast. 237 
Thuiaria buski (Allman). 
Desmoscyphus buskii Allman, 1876, p. 265: Farquhar, 1896, p. 465. 
The untenable genus Desmoscyphus embraced Sertularians in which the 
opposite hydrothecae are in contact with each other in front, and it 
included forms some of which belong to the genus Sertularia, ve wet 
to Thwaria, as now understood. uski, as Captain Totton in 
is extremely closely allied to the Thuiaria bicalycula of талу тво Mid it 
is undoubtedly to be referred to the same genus. 
Selaginopsis monilifera (Hutton). 
Sertularia monilifera Hutton, 1872, p. 257: Coughtrey, 1874, p. 282; 1875, 
p. 301; 1876, p. 30. 
Thuaria cerastium Allman, 1876, p. 2 
Thuiaria monilifera wore did 1879, 1 EUT Farquhar, 1896, p. 465. 
Dictyocladium dichotomum Allman, 1888, p. 77: Levinsen, 1913, p. 277. 
Selaginopsis dichotoma Billard, 1910, p. 16: Bale, 1915, p. 266. 
I have a fragment of S. monilifera from the collection of Hutton's 
types in Dunedin Museum, and specimens of Allman's types of 7. cerastium 
and D. dichotomum from British Museum. The Dictyocladium is more robust, 
with hydrothecae more distant; otherwise it does not differ essentially 
springing from one of the branches just on hy the axil, instead of fro 
the axil itself as in the “ Challenger " 
I have to thank Captain Totton for Panik out to me the identity of 
these forms. 
Sertularella edentula n. sp. (Fig. 6.) 
Hydrocaulus branched, fascicled in older portions, each internode of 
rachis bearing a single hydrotheca on one side, and a pinna between two 
h аас 3 on the is ; pinnae Т5 not close, rona straight, 
narrow at origin, with nodes few or absen 
Hydrothecae alternate, the two series sometimes more widely separated 
eee than in front, very stout, tubular, slightly narrowed upward, adnate 
in their whole length, somewhat contracted at aperture, which is at an angle 
of about 45° with axis of pinna, border circular, quite smooth, operculum 
of three valves. 
ia springing from rachis, very large and stout, in back or front 
view obovate, in side view with back more convex than front, a wide shallow 
Jongitudinal depression running whole length of do nd over summi 
ton). 
This is one of that group of species which, from the immersed 
bydrotióte, ^ as well as from their biserial and unpaired arrangement, 
were formerly regarded as typical Thuiariae. It somewhat resembles 
S. , but is a more robust species, with the hydrothecae larger and 
more fully divided off from the hydrocaulus. The pinnae, which may 
reach over lin. in length, may be wholly unjointed, or there may be 
