372 Prof. Allman on the Construction and 
Campanularia Johnstoni, Alder (sp.), = Campanularia volu- 
bilis, Johnst.,= Clytia Johnston, Agass. 
Campanularia noliformis, M‘Crady (sp.), = Clytia noliformis, 
Agass. 
“Campanulari ia cylindrica, Agass. (sp.),=-Platypyais cylindrica, 
Agass. : 
“Campanulari ia Gegenbaurii, Sars. 
Campanularia dichotoma, Kolliker. 
The following species are placed provisionally in this genus, 
the gonophores not having yet been observed in any of them. 
Further research will doubtless cause their distribution among 
two or more genera :— 
Campanularia volubilis, Linn. 
Campanularia verticillata, Linn. 
Campanularia Hincksi, Alder. 
Campanularia integra, Macgillivray. 
Campanularia raridentata*, Alder. 
Campanularia breviscyphia, Sars. 
Campanularia bicophora, Agass. (sp.), = Clytia bicophora,Agass. 
2. Opera, Péron & Lesueur. 
Trophosome.—Hydrocaulus branching, rooted by a creeping 
filiform hydrorhiza; hydrothece bell-shaped, with an entire or 
serrated margin, and destitute of operculum; tentacula sur- 
rounding the base of a very contractile, conical, clavate, or 
trumpet-shaped metastome. 
Gonosome.—Gonangia developed from the hydrocaulus, and 
containing phanerocodonic gonophores. Medusze very flat, so 
as to approach the form of a disc, with a short four-lipped ma- 
nubrium ; radiating canals four; marginal tentacles numerous, 
with their roots prolonged in the form of short czecal continua- 
tions into the walls of the umbrella; lithocysts two in each inter- 
radial space, each lithocyst placed upon the base of a tentacle at 
its inner side. 
The changes undergone by the Medusa in its progress towards 
maturity consist chiefly in an increase in the number of mar- 
ginal tentacula. 
Obelia dichotoma, Linn. (sp.), = Laomedea dichotoma, var. a, 
Johunst., = Campanularia gelatinosa, Van Ben. 
_ Obelia geniculata, Linn. (sp.), = Laomedea geniculata, Johnst. 
Obelia commissuralis, M‘Crady. 
Obelia diaphana, Agass. (sp.), =Eucope diaphana, Agass. 
* Judging from an observation of Wright (Mic. Journ. n. s. vol. ii.), 
it is quite possible that the Campanularia raridentata of Alder may belong 
to the genus Thaumantias. See below p. 377. 
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