132 
PROCEEDINGS OF SOCIETIES. 
1st. Z. auricula. —This species is provided with eight tufts of ten- 
tacula, placed at equal distances from one another, and having a marginal 
tubercle between each pair. The adherent disc is situated at the ex¬ 
tremity of a short peduncle. The colour is exceedingly variable. 
2nd. Z. campanulata .—The arrangement and number of the tenta¬ 
cular tufts is the same as in Z. auricula, hut the tentacula in each of 
them are more numerous, and the marginal tubercles are absent. The 
adherent disc is separated from the body by a cleft or stricture. The 
colour is greenish-brown. 
3rd. L. fascicularis, which has the margin surrounded by eight 
tentacular tufts arranged in pairs. The peduncle is long and wrinkled, 
terminating in a narrow adherent base. The colour is dark-brown. 
4th. Z. cyathiformis .—In this well-marked species the body is goblet¬ 
shaped, and the tentacular tufts are placed round the interior of the 
margin over which they slightly project. In the four remaining Bri¬ 
tish species they occupy the extremities of the produced marginal lobes. 
The peduncle is corrugated, and of equal length with the body. Its ex¬ 
tremity is dilated into a flat adherent disc. Its colour is greenish or 
dusky brown. 
5th. L. inauriculata , which differs from Z. fascicularis in having the 
eight tentaculiferous lobes equidistant from each other ; from Z. auricula, 
in the absence of any ear-like appendage at the middle of the border of 
the connecting webs between these lobes; from Z. campanulaia in the 
absence of the “two series of foliaceous processes arranged on each side of 
a white line,” extending from the sides of the mouth along the middle 
of each connecting web; and from Z. cyathiformis in the tentacles being 
supported in clusters, at the extremity of lobes produced beyond the 
margin of the infundibular disc. 
Some add a sixth British species, L. quadricornis, hut this is usually 
considered to he a variety of Z. fascicularis. 
The five forms above briefly described have been always viewed in 
the light of distinct species, and I am not aware that any naturalist has 
ever questioned the propriety of so regarding them. But the examina¬ 
tion of a form of this genus which I obtained in February of the present 
year, at Haulbowline, county of Cork, has led me to entertain a different 
opinion. 
The Lucernaria to which I allude was one-third of an inch in 
length, and of a delicate pink tint similar to that seen in some specimens 
of Z. auricula. In shape and general appearance it bore some resemblance 
to Z. fascicularis, hut the form of the body was fuller, and more cup¬ 
shaped. It was furnished, like that species, with a long peduncle, hut 
the latter was destitute of corrugations, and dilated at its extremity 
into an adherent disc, in both characters differing from the peduncle of 
L. fascicularis. The margin was surrounded by eight tufts of tenta-. 
culse arranged in pairs, but this arrangement was by no means so well 
marked as in the last-mentioned species—the tufts, at the first view, ap¬ 
pearing to be almost equi-distant. Between each of the pairs a margi¬ 
nal tubercle occurred. In other respects the oral aspect was not unlike 
