Barr.—Hydroids from the New Zealand Coast. 233 
The hydrothecae of O. crenata vary greatly in form. Some are smooth 
and with the wall л equally thick from base up to just below margin ; 
others have the outline wavy, and in such cases the undulations of outside 
ecalling essa. This thickening ends abruptly just below rim, 
whisk being very thin and usually turned out horizontally, causes the teeth 
to be commonly indistinguishable in the ordinary side view. Hydro- 
ae “йе than those of any other species I have seen. 
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\ 
Fic. 3.—Orthopyxis crenata (Hartlaub). х 40. 
Pedicels may be scarcely longer than hydrothecae, or many times as 
long; their undulations may be very pronounced or only slightly indicated, 
= thic а perisarc varies considerably. 
saw no gonangia, and quote Hartlaub's description. 
(The fti бааа by Nutting is that which Hartlaub referred doubt- 
fully to E. crenata, but which he afterwards recognized as distinct, and 
which Jäderholm calls Campanularia lennoxensis.) 
Silicularia bilabiata (Coughtrey). (Fig. 4.) . 
Campanularia bilabiata Coughtrey, 1874, p. 291; 1875, p. 299; 1876, p. 25: 
Farquhar, 1896, p. 460. 
M ii cues bilabiata Hilgendorf, 1897. p. 213: Bale, 1914a, p. 89. 
s species m readily be identified by Coughtrey's figure of the 
hydrothcen which is much larger and of longer proportions а that of 
nularia; among them, however, are a few with much shorter 
diameter at point ot аай is little more than that of interior of tube ; 
in this respect they resemble those of S. campanularia. Hilgendorf 
specially mentions this character, but his figure represents a very thin- 
walled pedicel. Both Coughtrey and Hilgendorf note that hydrothecae 
are set ле pedicels at an angle of 45°; this character is not constant, but 
I find it in most of the hydrothecae, and when it occurs it is always the 
