REPORT ON THE HYDROIDA. 
19 
with true campanulate and pedunculate hydrothecae, and will leave the remainder of those 
which would have come under Lamarck’s definition to find their places in other genera. 
It is unfortunate, however, that the trophosome seldom presents any character which 
would enable us to assert that its gonophores are hedrioblasts rather than planoblasts, 
and since in many of the species obtained by the Challenger the gonosome is entirely 
absent, we are forced to regard the allocation of these species to definite genera as possessing 
only a provisional validity, liable to be set aside on the discovery of the gonosome. 
Campanularia insignis, n. sp. (PI. IX. figs. 1, 2). 
Trophosome . — Colony attaining a height of six inches ; stem monosiphonic, clustered, 
springing from a creeping tubular fibre, regularly set with pinnately disposed alternate 
ramuli, but otherwise simple or very sparingly branched, both stem and ramuli divided 
into internodes by equidistant transverse joints. Hydrothecse borne both by stem and 
ramuli in two alternate series, every internode supporting a hydrotheca on a point close 
to its distal end ; hydrothecse deep, cylindrical for some distance from the orifice, and 
then gradually narrowing into a short peduncle which is borne through the medium of a 
very short annular segment on the summit of a lateral process of the internode; margin 
perfectly entire and surrounded by a narrow band. 
Gonosome not present. 
Locality.— OR Bermudas ; depth, 30 fathoms. 
Campanularia insignis is a large and handsome species. The long, almost always 
undivided stems spring from the hydrorhizal plexus in clusters of five or six, and carry 
along nearly their entire length alternately disposed pinnae. Every pinna carries two 
opposite series of alternate hydrothecse, and two exactly similar series are carried by the 
stem. 
The walls of the hydrotheca are towards the base slightly more convex on the side 
which is turned away from the internode than on that which faces it, and the perforated 
diaphragm which forms the floor of the hydrotheca and separates its true cavity from that 
of the peduncle is oblique. The peduncle joins the supporting process of the internode 
through the medium of a very short annular segment. 
Campanularia insignis comes very near to one of the Gulf Stream Hydroida which, 
under the name of Ohelia marginata, was in the absence of the gonosome referred 
provisionally to the genus Ohelia. It differs, however, from that species in the shape of 
the hydrothecse, which in the Gulf Stream species have rather the form of an inverted 
cone caused by the gradual diminution of the diameter towards the base; while a further 
difference is found in the interposition in Campanularia insignis of a short annular 
segment between the peduncle of the hydrotheca and its supporting internode. 
