24 TURRIS NEGLECTA. 
The radiating vessels are four, and all simple. The margin of the umbrella is studded 
with a close-set circle of tentacula, more than sixty in number (16 44+-4), very contractile, 
being sometimes elongated into hair-like filaments, and at others contracted into little knobs. 
Each tentacle has a large bulbous base, the upper part of which bears a brilliant ocellus, 
consisting of crimson pigment-cells, and there is another speck, probably the site of an otolitic 
mass below. 
A very interesting account of this species, under the name of Cyan@a coccinea, was given 
by Dr. J. F. Davis, in the seventh volume of the ‘Annals of Natural History.’ “ Amongst 
the variety of animals,” writes that gentleman, “which we had opportunities of seeing, 
during our stay at this charming marine watering-place (Tenby), none afforded greater interest 
than a small Medusa belonging to the genus Cyan@a, Cuvier. ....... Having been dis- 
covered by Mrs. Davis, who had likewise the best opportunity of watching its motions during 
several weeks that she kept it in a glass of sea-water at Tenby, and afterwards here (Bath), 
whither it was conveyed in a phial of the same, and lived three weeks after its arrival, I will 
state the history of this ‘thing of light and life’ in her own words. ‘One morning, while 
pouring some sea-water into the vessel containing my Acétiniz, I observed two small objects, 
which I took for the young of these animals, and as quickly as possible raised them in a spoon 
out of the basin, and placed them in a tumbler of clean sea-water. They resembled tiny bell- 
glasses. Four transverse rays were perceptible on their sides, and a minute red body, with 
four white arms forming a cross, was suspended in the water. Around the edge of the bell 
or disk appeared a delicate white fringe, which was lengthened or shortened at the pleasure 
of the animal. The contraction was sometimes so great, as to give the fringe the appearance 
of being knotted up to the edge of the bell or disk. It was highly interesting to watch their 
movements in the water as they ascended from the bottom, the bell or disk contracting and 
dilating alternately, until the animal arrived near the surface of the water. This motion was 
particularly conspicuous at the edge of the disk, and the fringe or tentacula became shortened 
as the animal rose in the water; but when they descended again the tentacula lengthened, 
sometimes to a great degree, after which the animals sunk gradually, and without any visible 
effort. At the end of a fortnight one of my pets turned itself mside outwards, and remained 
in this state for some time, when it died, and left only a few flocculent particles at the bottom 
of the vessel. The other lived more than two months longer, and even bore a voyage to Bath 
in a closed phial of sea-water, and remained active and vigorous during the space of three 
weeks, when it likewise shrunk, died, and disappeared like the former, but without the previous 
eversion.’”” 
Plate III, fig. 1, a, Turrts neglecta, much magnified ; 1, 6, body seen from above, showing 
the muscular bands alternating with the vessels; 1, ¢, proboscis and lips; 1, d, one of the 
lips magnified ; 1, e, a group of tentacles ; 1, g, a tentacle with its bulb, showing the ocellus 
and otolitic mass; 1, 2, portion of a tentacle highly magnified; 1, 7, ova; 1, 4, muscular 
tissue. ' 
