Dr. R. Bergh on Phidiana lynceus. 135 
margin of the depression in which the tentacle stands, and 
even further, so as to form a narrow black border along the 
lobe between two succeeding tentacles; in these cases the 
underside of the base of the tentacle is occasionally also 
coloured. In some individuals no pigment was observable, 
and the tubercles were then generally but little developed. 
These latter are of a firm consistency ; and their colour is due 
te peculiar cells, which stand perpendicular on the surface, and 
much resemble those observed in the eyes of various mollusca. 
No ganglion could be found in the base of the tubercles ; and 
therefore the tubercles in question cannot even be regarded 
as merely photoscopic eyes, much less as corresponding in 
structure with the real eye of these animals. Something 
similar, but in smaller degree, was observed in MM. cinerea, 
Couth. (var. grandis). The real eye in Margarita was seen 
as a black spot shining through the apex of the ophthalmo- 
phorium; and on this spot a small oval opening was observed, 
of varying size, and which could be distended by pressure. 
No lens, nor apparently any vitreous humour existed. A simi- 
lar opening seems to exist on the eye of Missurella rosea (Lam.). 
If these observations are confirmed, the eye will in these 
animals exhibit the same remarkable structure, without diop- 
tric apparatus, which has been found in Nautilus. To return 
to Phidiana lynceus, it may be observed that a doubling of the 
eye on one or both sides has certainly been observed as a mon- 
strosity in many Gasteropoda; but the occurrence of accessory 
eyes in the Phidiana was certainly no monstrosity, for the 
three individuals examined agreed perfectly in this respect. 
Nor could these organs be interpreted in any other way than as 
eyes. There exist, no doubt, Adolididze in which the ear remains 
in its embryonal stage, with one otolith ; but, excepting a few 
Pteropoda, there exists scarcely any Gasteropod in which the 
ear exhibits such a development of pigment as is seen in the 
organs referred to in Phidiana lynceus. 
The band or tube connecting the sacs which contain the 
urticating cells with the lobes of the liver was unusually long 
in this species, rolled up in a coil generally placed on one side 
of the lobe. Both cysts and free urticating cells were seen 
dispersed through the whole length of the tube. Dr. Bergh 
does not agree with the theory advocated by Prof. Huxley, 
Dr. Gosse, and Mr. Strethill Wright, that the urticating cells 
in Alolidide are a kind of fecal excretions, and derived from 
the animals on which they live; for sacs containing urtica- 
ting cells are wanting in many genera, as Hmbletonia, Fiona, 
Phyllodesmium, in Hermacine and Proctonotine, though these, 
or at any rate most of them, certainly feed upon animals which 
