376 Prof. Allman on the Construction and 
The genus Campanulina was constructed by Van Beneden (Bull. 
Ac. Roy. Brux. 1847) for a delicate Campanularian Hydroid whose 
most striking character appeared to the Belgian naturalist to be the 
broad membranous web by which the bases of the tentacles were 
united:to one another. He named the Hydroid which he thus took 
as the type-species of the genus Campanulina tenuis. 
Mr. Alder, from an examination of authentic specimens of Van 
Beneden’s Hydroid, has since determined its identity with the spe- 
cies which had been described by himself under the name of Lao- 
medea acuminata. As Van Beneden, however, has given us no de- 
finite specific diagnosis, while Alder has given us a very full and 
complete one, and as Alder’s specific name has thereby become ge- 
nerally adopted, it will be more convenient to retain the name of 
acuminata rather than that of tenuis, and the rules of priority will 
hardly be so stringently interpreted as to offer any valid objection to 
this course. ; 
In drawing up the diagnosis which I have given above for the 
genus Campanulina, I have deemed it better to make it sufficiently 
comprehensive to include Campanulina repens, Allm., a Hydroid 
discovered by myself, and which, with undoubted affinities to Campa- 
nularia acuminata, may possibly be regarded as presenting a separate 
generic form. It differs from C’. acuminata in the fact of the hydro- 
thecee being provided with a true operculum formed of converging - 
lanceolate segments, instead of having the undivided membranous 
termination which these receptacles exhibit in C. acuminata, and in . 
the web which connects the bases of the tentacles being so slightly 
developed as to be nearly obsolete. 
Besides this, the Medusa escapes from the gonangium with four 
well-developed marginal tentacles—a feature, however, which may 
only indicate a more advanced stage of development at the time of 
liberation, and not such as can be employed as a generic character, 
unless the difference in this respect between the two Medusz can, 
by further observation, be shown to be permanent. I have recorded — 
this Hydroid in my note-book under the generic name of Hypsoro- 
phus (inyépodos, high-roofed), in allusion to the high conical operculum 
by which the hydrotheca is closed on the retreat of the polypite ; 
but I prefer to keep this name as provisional, dependent on further — 
observation proving that the difference between the Medusze at the — 
time of their liberation is persistent—a character which may then, 
when combined with the difference between the hydrothece, be re- 
garded as truly generic. 
Campanulina acuminata, Alder (sp.), = Campanulina tenuis, — 
Van Ben., = Laomedea acuminata, Alder, = Wrightia acuminata, — 
Agass. 
Campanulina? repens, Allm. 
Aiquoride, 
1. Zycopactyta, Brandt. 
Trophosome.—Hydrocaulus simple (or branched ?), rooted by 
a 
