350 Haliclystus at Scarborough. 
Hood’s Bay, during August, and report the capture of an 
adult Lucernaria on Ulva by dredge. 
Very few specimens of Lucernaria campanulata continue in 
evidence at Scarborough, and these have lost the white egg 
masses which were so conspicuous in May. Unfortunately 
the process of spawning and hatching was not seen, but as the 
result young lucernarians are now abundant in the same region, 
invariably, as their parents were, attached to AHalidrys 
siliquosa. 
It is curious that the young of Lucernaria, and the young of 
Haliclystus, whose habits are to all intents and purposes the 
same, and whose food supply is identical, should exhibit well 
marked preference for dissimilar weeds so that, without ex- 
amining the animals, one can positively determine the species 
by the weed which supports it. What instinct causes Lucer- 
naria to select Halidrys, and Haliclystus, Ceramium? Is 
there some inherent colour sense that guides aright ? Both 
species are carnivorous, hence the plants chosen are simply 
protective supports, not food. Why Aaliclystus in later life 
should transfer itself from ved Ceramium to green Zostera is 
a colour problem. One thing is certain, the tints, varying from 
green to red and brown, which characterize the young, har- 
monise perfectly with a Ceramium environment, and_ render 
detection improbable, save in good light to a trained eye. 
Two diagrams, based on photo-micrographs, of a very young 
Haliclystus, 32; inch in diameter when fully expanded, afford 
details for comparison with sketches of Lucernaria given in 
the July Naturalist. The creature had been under observation, 
in a glass cell containing sea-water, for some weeks, and as it 
had fixed its disc to the centre of the glass bottom it provided 
an unusual object for microscopic study. Its essential move- 
ments corresponded precisely with those of Lucernaria, con- 
firming the impression that lucernarians are much more akin 
to actinozoa than to meduse. An anesthetic, sufficiently 
powerful to suspend movement and sensation without causing 
an organism to alter its life-like appearance, is useful in eluci- 
dating anatomical detail. Chloretone, 5 grains, in an ounce of 
distilled, or cold boiled water, answers best. If the dose 
administered is neither too large, nor too prolonged, delicate 
creatures, when transferred to fresh sea-water, soon recover 
from its effect. Chloretone, too, may be employed advantage- 
ously in heavier dose, as a preliminary to preservation with 
formalin, to ensure specimens being fixed permanently in a 
natural condition for Museum purposes. Under microscopic 
observation, the selected Haliclystus, covered with a minimum 
of sea-water, was given clear chloretone solution through a 
pipette, drop by drop, until the whole surface of its bell, and 
all its tentacles, were at rest. Suddenly a final, but unlooked 
Naturalist, 
