Bate.—Hydroids from the New Zealand Coast. 261 
> e opening between 
hydrotheca and internode is much as in 4. acanthocarpa, but the shelf- 
like border is slightly narrower. 
The Thecocar lazus of Billard is readily distinguishable from this 
species, even in the absence of corbula. In laxus intrathecal and 
the condition being the opposite in A. laza. The third ridge is not present 
in T. lazus. In A. laza, as in all the divaricata group, the second lateral 
tooth of hydrotheca is notably everted, and the others not at all; in 
Billard‘s species the third is widely everted, and the second but little 
everted, or even incurved. 
Hilgendorf’s * А. lara” is, as mentioned elsewhere, A. acanthocarpa. 
Specimens referred to A. laxa by Stechow, which had only two shallow 
triangular lobes on each side of hydrotheca, were afterwards regarded by 
him as A. whiteleggei. 
The gonosome of A. laza is not yet known, but the close affinity between 
ies and A. acanthocarpa and A. divaricata renders it highly 
the species 
probable that it will prove to be of the same character as in those species. 
Thecocarpus formosus (Busk). 
ormosa Bus 851, p. 118. 
Aglaophenia formosa Allman, 1871, p. 157: Kirchenpauer, 1872, p. 26: Bale, 
1884, p. 168: Marktanner-Turnerctscher, 1890, p. 264: Farquhar, 1896, 
s formosus Billard, 19072, pp. 378, 385: Stechow, 1912, p. 370; 
appropriate to the closed form. 
Allman referred to the species as being known to him from Australia, 
New Zealand, and South Africa, and Billard adds Madagascar and Ceylon. 
ave never met with the species in collections from Australia or New 
Zealand 
Thecocarpus chiltoni n. sp. (Fig. 16.) 
Hydrophyton polysiphonie, pinnately branched, branches in one plane, 
alternate, subregular, rising at an angle of about 45? from the primary 
