pr Busi Anwan’ 5 Salita: f the Onchidium. -133 
‘convex, afh- óloméd) and covered with cai sayencies Fu 
in fize and: pofition. 51 arjit 
United lenethwife, on the under fide, to Hie ia cs is bar tm 
nexus would call the foot of the animal, as being the organ of mo- 
tion and ftability.. It is of a dirty yellow colour, linear, about a 
quarter of an inch fhorter than the body at each end when in mo- 
tion, and obtufe at the ends: it is flat below, and perpendicular at 
the fides.” It confifts of many tranfverfe rings, like a Lumbricus, 
by means of which the animal can move with tolerable quicknefs, 
adheres firmly-to the fmootheft furfaces in all directions, and turns 
itfelf flowly round. 
_ The head is yellowi(h, finall, ind placed under the fore part of 
the body, at the fore end of the foot, to. which it is joined. During 
the various operations performed by the animal, its head is con-` 
{tantly changing its form and fize; and, when entirely at reft, it is 
drawn up fo as to be hardly perceptible. When fully expanded, 
_ the head is flat and oval below; and there is a mouth placed length- 
wife with refpe& to the animal. This mouth alfo is conflantly va- 
. Tying its fhape from circular to linear. From each fide of the head 
comes what Linnzus calls an arm (brachium), like thofe of the Scy/- - 
' læa, conftantly varying its form and fize, and at times entirely drawn 
in. Thefe arms are folid, compreffed, and, when fully expanded, 
fomewhat palmated; at leaft they are much broader and flatter to- 
wards the outer extremity. From the forehead arife two feelers, 
tentacula of Linnzus, exactly like the horns of a Slug, and having 
the appearance of eyes at their extremities. ips 
— 'This is not, like many others of the worm kind, an berméphro- 
dite animal, for the male and female organs of generation are in 
diftin&t individuals. I have not yet -— — any mark to diftin- 
CP gh the fexes while they are not in a, an in both, the anus 
"and 
Mi n s 
3 
