Covcutrey.—Critical Notes on the New Zealand Hydroida. 301 
calceolifera, Hincks, ‘‘ Annals N.H.,” Ser. 4, Vol. X., p. 85. It never 
attains a greater height than two inches. 
Sertularia pumila (sp. noy. to N.Z.), Syntheciwm gracilis, mihi, ‘ Trans.” 
loc. cit., p. 286, Figs 26 to 81, Pl. XX. 
I am now perfectly satisfied that I was in error when I placed this 
species under Allman’s genus Synthecium. I have carefully compared it 
with varieties of S. pumila from the Mersey (Britain) and elsewhere, and * 
cannot detect sufficient specific characters for a new species. The differ- 
ence I observed in the New Zealand specimens as shown in Trans. loc. cit., 
Pl. XX., Figs 26 and 27 (both magnified to same extent) is present in 
British specimens, and one character has been observed by Dr. M‘Intosh, 
in St. Andrew’s specimens (namely, presence or absence of joint in the 
stem). ‘Annals N. H.,’”’ Ser. 4, Vol. XIL., p. 205. 
Sertularia elegans. Synthecium elegans, Allmans. (Gymnoblastic 
Hydroids). 
Another small specimen has enabled me to confirm my previous identifi- 
cation of this species. It is equally pigmy in size with my first one, and in 
one of the calycles has the lower three-fourths of the pecular ovarian capsules 
described by Professor Allman.* 
Sertularia monilifera, Hutton. Coughtrey, “ Trans.,’’ loc. cit., p. 282. 
I am now inclined to place this species under the genus Diphasia. 
Genus Hydralmania, Hincks. 
During my two visits to the Bluff Harbour, I obtained a most beautiful 
Hydroid, which I have provisionally placed under the above genus with the 
Specific name of bi-calycula. The description of H. bi-calycula is given in 
the communication to the “ Annals” before alluded to. 
Genus Thuiaria. 
T. sub-articulata. I am now quite satisfied that this species is distinct 
from the British species 7’. articulata. '. articulata is by far the finer and 
more delicate of the two, its pinne are longer, the hydrothece more evenly 
tubular and free from dentations, while the absence of transverse wrinkles 
over the whole of the ovarian capsules contrasts clearly with the New Zea- 
land form. Though some of the British specimens have the proximal 
three-fourths of the ovarian capsules wrinkled. 
Our Southern specimens bear the same relation to the East Coast 
ones, as Mr. Norman’s Shetland variety, bears to the ordinary British 
form, 
Regarding the members of the family Plumularide, I desire to reserve 
my notes with one exception, and that is Plumularia simplex, mihi. Fresh 
* In Annals loc. cit., I describe a specimen from the Bluff Harbour that is very like 
S. pumila. 
