Dr. Buchannan'j Account of the OnchMum. 133 



■convex, afli-coloured, and covered with glandular tubercles irregular 

 in fize and pofition. 



United lengthwife, on the under fide, to the body is what Lin- 

 naeus would call the foot of the animal, as being the organ of mo- 

 tion and {lability. 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 direclions, and turns 

 itfelf flowly round. 



The head is yellowifh, fmall, and 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- 

 ftantly 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 refpedl to the animal. This mouth alfo is conflantly va- 

 rying its fhape from circular to linear. From each fide of the head 

 comes what Linnasus calls an arm {brachiuin), like thofe of the 59'/- 

 Ifca, conftantly varying its form and fize, and at times entirely drawn 

 in. Thefe arms are folid, comprefled, 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, 

 ientactila of Linnaeus, exa6lly like the horns of a Slug, and having 

 the appearance of eyes at their extremities. 



This is not, like many others of the worm kind, an hermaphro- 

 dite animal, tor the male and female organs of generation are in 

 dilHn6t individuals. I have not yet perceived any mark to difi:in- 

 guilli the fexes while they are not in copulation, as, in both, the anus 



and 



