472 PROFESSOR G. J. ALLMAN ON THE HYDROIDA 
few other gymnoblastic species were collected. These belong apparently to the genera 
Eudendrium and Perigonimus ; but the state of preservation of the specimens is not 
such as to render it possible to determine them more closely. 
DESCRIPTIONS OF NEW SPECIES. 
LAFOEID. 
Laroiia HALECIOIDES. Plate LXVI. figs. 1, 1%. 
Trophosome.—Stem attaining a height of about two inches, pinnately branched, rigid, 
branches alternate, main stem and primary branches fascicled ; ultimate ramuli jointed 
at irregular intervals, not fascicled. Hydrothece shortly pedunculate and disposed with 
a regularly pinnate and alternate arrangement along the length of the ultimate ramuli, 
and along that of the principal branches, one almost always situated in the axil of each 
ultimate ramulus ; deeply cyathiform, with the axis slightly curved, and with the margin 
even, and slightly everted, usually marked for some distance below the margin by 
faint circular striz. 
Gonosome not known. 
The present species has a very rigid habit, and possesses much of the aspect of certain 
Haleciums. It approaches Lafoéa fruticosa by its large size and shrubby growth, but 
differs from it by its pinnate ramification and Haleciwm-like habit. As in every other 
species of Lafoéa hitherto described, no gonosome was present. 
It was dredged from the cold area at depths of 640 and 345 fathoms, the temperature 
in both cases haying been ascertained to stand at 30° Fahr. 
THUIARID. 
TuHuraRIA LAXA. Plate LXV. figs. 1, 1%. 
Trophosome.—Stem. attaining a height of about nine inches, and furnished with 
fan-shaped groups of dichotomous branches for some distance from the distal extremity, 
while it is destitute of branches for the greater part of its course; groups of branches 
about an inch in length, flexile, arched, with the convexity of the curve looking upwards, 
arranged spirally, rather distant, each branchlet of every bifurcation having a joint at 
its base, and having for the most part one or more joints at irregular distances along 
its length; stem gently zig-zag, annulated at the base, and with groups of two or three 
annuli at intervals for some distance upwards, giving the appearance of joints. Hydro- 
thecz scattered upon the main stem, but on the branches alternate, each separated from 
those above and below it by a space equalling about one fourth of its own height ; orifice 
transversely elliptical, provided with a valve-like operculum. 
Gonosome.—Gonangia piriform, springing from the upper side of the branches, each 
in an interval between two neighbouring hydrothece of a series. 
