Barr.—Hydroids from the New Zealand Coast. 241 
Hydrothecae adnate about half their height, divergent, very stout, 
mostly thick-walled, smooth, usually with extreme distal part bent outward ; 
border with four marginal teeth or shallow emarginations ; three internal 
compressed vertical teeth, two of which are within the two upper 
emarginations of border, and the third below inferior marginal tooth. 
Gonangia large, about 3-33 times the length of hydrothecae, obovate, 
with a few transverse rugae and no distinct neck, flattened at top, without 
distinct teeth. 
Loc.—French Pass (Hartlaub): Akaroa (Chilton): “ New Zealand " 
(Hincks collection, British Museum 
Notwithstanding that this species has the mouth of the hydrotheca 
distinctly four-sided, Hartlaub has referred it to S. solidula, which has the 
aperture three-sided, on the ground that several species of Sertularella 
vary in this respect. I have not met with such; in any case, among the 
Fic. 7.—Sertularella € ierra x 40. 
Fic. Hane ertularella crassiuscula n. s x 40. 
many forms of S. indivisa (of which species S. solidula is a variety) I 
have never seen a four-sided specimen, and, on the other hand, in the 
zonias group the four-sided condition seems invariable. It is even 
ed by Stechow, in a recent paper, to establish distinct genera for 
the thre-ided and the four-sided species 
ndoubtedly, however, a strong similarity exists between the present 
species asd the form described as S. solidula by me, a similarity which 
depends mainly on the very stout hydrothecae, the thick solid-looking 
perisare, and the relative shortness of the internodes, which are swollen, 
and abbreviated below. In all these points the species differs from 
S. simplex. 
The hydrothecae are larger than those of S. solidula, and have always 
four emarginations of the border, which are very shallow, especially in 
