244 
ILYANTHID.E. 
DisTc. Reddish buff; each radius marked with a minute brown speck 
in its centre : the gonidiat radius, however, and the opposite one, are pure 
white, without spots. 
Tentacles. Pellucid, each marked with a double row of brown arrow- 
heads, exactly as P. hastata, but the foot is crossed by a hand of deep 
brown, the discal edge of which is perfectly defined ; the confluence of 
these bands forms a broad circle of brown bounding the disk. In the 
gonidial tentacle, however, and in the opposite one, the band is wanting, 
as well as the lower arrows, the opaque white of the radius running up 
the front of each of these tentacles half-way to the tip. 
Mouth, Dark brown. 
Conchula, Pure opaque white ; the lobes without spot or core. 
Size. 
Length three inches; greatest diameter one inch and a half. Disk 
three-quarters ; tentacles about one inch, j 
Locality. 
The Channel Islands. 
I have had no opportunity of seeing the animal to whieh 
the above deseription applies. It "was taken at Guemsey, 
in December, 1858, and came into the possession of Dr, 
G. C. Wallich, who has kindly drawn out for my use 
copious notes, and furnished me with beautiful coloured 
drawings. It appears intermediate between hastata and 
undata, the species already recognised ; but I cannot'satis- 
factorily assign it to either, as it differs from both in the 
form and number of the conchular lobes. I have there- 
fore given it a name expressive of these peculiarities. 
“ The suctorial processes,” remarks Dr. Wallich, “ ap- 
pear to consist of simple depressions of the integument, 
each of which exhibits an oblong muscular body at its 
base, whereby a vacuum may be formed, and adhesion 
accordingly secured. On examining these muscular bodies 
under a power of 250 diameters, longitudinal as well as 
transverse strim are distinguished. Tlie nature of these 
.suckers was strikingly manifest on attempting to turn the 
animal in the glass, when tliey exhibited the appearance of 
