REPORT ON THE HYDROIDA. 43 
In all the specimens examined the phylactocarps were enveloped in a glairy mass, 
insoluble in boiling water, but completely soluble in a solution of caustic potash. I have 
no doubt of this being the remains of the protoplasmic contents of the nematophores, and 
that in the living state it had been emitted as pseudopodial outflows from the cup-shaped 
nematophores here so largely developed. 
I believe that the present species must be identified with the Aglaophenia (Lyto- 
carpia) secunda of Kirchenpauer,! though in some points, especially in the form of the 
hydrotheca and of the comb-like phylactocarps, it can scarcely be brought into complete 
accordance with Kirchenpauer’s figures. Kirehenpauer’s specimens were obtained in the 
South Sea, the China Sea, and the Pelew Islands. From the last-named locality they 
were brought by Semper, who, according to Kirchenpauer, regarded the species as one of 
those so much dreaded by the natives on account of its stinging properties. 
The limits of the plate would not allow a figure to be given of more than a portion of 
the entire Hydroid. The Challenger collection contains a specimen which is more than 
two and a half feet in length. 
Dredged off Zamboanga, Philippines, 30th January 1875, from a depth of 10 fathoms. 
Lytocarpus spectabilis, n. sp. (Pl. XV.). 
Trophosome.—Colony attaining a height of five inches; main stem strongly fascicled 
sub-dichotomously branched, the branches closely set with opposite primary pinne, which 
are fascicled at their origin, and destitute of hydrothee, but which carry the alternately 
disposed hydrocladial pinnze ; hydrocladia about one-tenth of an inch in length, borne 
also by the main stem in the intervals of the primary pinne. Hydrothece wide, 
with undulated margin, an anterior parietal fold, and a very short intrathecal ridge ; 
mesial nematophore thick, adnate to the hydrotheea walls for somewhat more than half 
their height, and then continued as a strong, free, spine-like process, which shiehtly 
overtops the hydrotheca margin, and has a lateral as well as a terminal aperture ; lateral 
nematophores spine-like, conical, overtopping the hydrotheca. 
Gonosome.—Phylactocarps given off at intervals among the hydrocladia, each replac- 
ing a hydrocladium, and consisting of a jointed rachis composed of some eight or nine 
internodes, the proximal internode carrying an ordinary hydrotheca, and each of the 
following internodes sending off two opposite, strong, conical spine-like processes, each 
with a terminal and a lateral orifice. Gonangium nearly sessile, borne by the modified 
second internode of the rachis. 
Lytocarpus spectabilis is a beautiful bipinnate form, and presents in its details several 
features of interest. The margin of the hydrotheca, instead of presenting the serrated 
condition usual among the phylactocarpal Plumularide, is merely sinuous, while the 
1 Kirchenpauer, oz, cit., p. 35, pls. iii. fig. 1. 
