75 
Reiving sides of rocks between tide marks, where it is 
r®quently left dry by the ebbing tide. In a contracted state 
,s hemispherical or conoidal; in its expanded more or less 
Columnar, with its upper extremity surrounded with several 
Ser 'es of tentacula, and a free plaited margin which folds in 
covers the tentacula when the animal is contracted. It 
J a ries in size to one inch or one inch and half in diameter at 
! ts base and to the same in height. The surface of the body 
* 5 s mootli, but is frequently drawn into longitudinal and cir- 
® u !ar folds at the will of the animal. The colour is liable 
many variations of brown, green, red and sometimes a 
fixture of the whole in longitudinal stripes. The tentacula 
?. re in several series, small and with the oral disc always of a 
'Shter colour than the rest of the body ; between the outer 
of tentacida and the free plaited edge of the disc is a 
l' rc le of azure blue tubercles, which are most apparent when 
, le animal is semi-expanded. Though these tubercles are 
' Scribed as being blue, yet I have seen many red, and in 
a,le locality they are all white, the whole animal in the same 
*P°t i s ver y frequently of a transparent whitish pink colour, 
,,(J sometimes of a pure white. This spot is rather ex- 
ited to the sea, but sheltered by a ledge of rocks, the 
P? lt °tn is sandy, and the place is very frequently nearly 
A with decomposing sea weed. The verge of the base is 
v ' Va ys of lighter or different colour from the body and is 
frequently formed by a blue band. 
^ frmrtner was of opinion that this species changed its colour 
1 1 the seasons, being red in summer and brown or green in 
Otnu, this however appears to be without foundation ; the 
S( A‘ brown and green varieties occur mingled together at all 
O j/ ls ons ; there is, perhaps, a little variation in the lightness 
l be tint during summer, but each retains its own colour 
jA' oughont the vear. In some situations, such as the upright 
a stone ‘" n a sandy or muddy soil, the animal becomes 
b e flaccid and so different in form and colour, as scarcely to 
.^cognised ; but they always possess the rim of tubercles, 
6() . b y this they may be known. It is a very cleanly species, 
op "dwayg prefers for its place of fixture the sloping surface 
\v a . a r ock, where it can be abundantly supplied with good 
. er ; if this cannot be procured, it suffers by the change. 
^TlNlA VIDUATA. Body conoid, longitudinally 
Aliped with light brown or yellow and white; tentacula 
lar ked with circles of the same. 
Ustinia Viduata, Johnston in Mag. Nat. Hist., vol. 8, p. 82, 
' I3 J Brit. Zooph., p. 211, fig. 29, p. 205. 
gr 0 a ^* From deep water on the Pinna ingens ; and in sandy 
^°onib U ? Ur * 0W water mar k* Polperro, Whitsand bay. 
