44 
Journal of the 
has very kindly forwarded me drawings of the species described 
in the “Voyage of the Rattlesnake,” with mounted specimens of 
•a number of them, thereby assisting me very materially. 
I have to thank Mr. Haswell for a collection of Hydroids from 
various places on the east and north-east coasts of Australia, 
comprising fifteen or sixteen of those described by Mr. Busk, three 
of those in the preceding paper, and nine or ten others, most of 
which are probably new. Eight species common to the southern 
coast are included in this collection ; of these one is from Botany 
Bay, one from Port Jackson, five from Port Stephens, and one— 
Idia pristis (Lauix.)—which is common on the north-east coast, 
is recorded (on the authority of Mr. Haswell) from Griffiths’ Point. 
I hope to furnish fidl descriptions of the species contained in 
this collection, also of the new Sertnlarice from Queenscliff, in 
future papers; at present I shall deal only with those species 
which are mentioned in the foregoing paper. 
I have received from Mr. Smeaton some sea-weed covered with 
a luxuriant growth of Pluvmlaria compressa, by which I am enabled 
to correct the somewhat erroneous description taken from mounted 
specimens; also a branch of Idea prist is from Port Darwin, with 
the curious campanularian parasite, formerly described as its 
gonotheca. I had previously noticed this hydroid (which strongly 
resembles the pyriform, transversely ribbed gonotheca of certain 
Plumuhtrict) on one of Mr. Hasweli’s specimens of Idia, and 
ascertained its parasitic nature, and it appears from Mr. Busk’s 
drawings that he had also noticed it. 
I regret that I am still unable to ascertain whether any of the 
Aglaojihenice which I have described are identical with those of 
Kirchenpauer, Mr. Halley having kindly endeavoured when in 
London to procure that author’s papers on the Hydroida, but 
without avail. 
Sertularia operculata , Lin. This species is common in Victoria, 
and Mr. Haswell’s collection contains specimens from Port 
Stephens. 
Sei'tularia Jlosculus , D’A. W. Thompson. Mr. Thompson 
suggests that this may be S. divergent, Lamx., and as it is the 
same as the species identified by Mr. Busk with S. divergens it 
will be advisable to retain that name for it. Mr. Busk’s specimen 
is from Swan Island, Banks Strait. 
