the Hirudo complanata, and Hirudo stagnalis. 341 
The Hirudo Hyalina which, Muller observes, has a flat- 
tened body, and carries its young in a pouch, and the Hirudo 
tessulata of the same author, will, I think, also be found upon 
examination, to belong to this new genus. 
The tubular tongue very seldom falls within our view ; 
hence our surprise is the less, that it should so long have 
escaped notice. At the time I first observed it, I was unac- 
quainted with any author, who had mentioned it. On my 
referring, however, to Bergmann’s account of the Hirudo 
sexoculata , (now G. tuberculata ) I find it there noticed, not 
as a tongue, but as a slender body, of a whitish colour, 
occasionally projected from the mouth ; of the use of which 
he confesses himself to be ignorant. I give his words, 
O g 
<f JJtur munnen har jag atskille ganger sett utrackas en blek, 
smal lem , hvars ?nytta ar mig obekant Muller mentions 
that he never witnessed (although he frequently looked for 
it) the body which Bergmann saw the Hirudo sexoculata 
thrust from its mouth : but he once observed the Hirudo 
vulgaris protrude a similar organ, when, he says, this asser- 
tion of Bergmann came across his mind. On his observing 
it, however, more narrowly, it proved to be a small aquatic 
worm that the animal had swallowed and afterwards rejected. 
This readily accounts, he adds, for the mistake into which 
Bergmann has fallen. 
In stepping forward to support Bergmann, I am only doing 
an act of justice to the merits of an accurate and intelligent 
observer. 
Having had the G. tuberculata and G. punctata under my 
* Stockholm Transactions, for 1757, p. 313- 
