244 
Miscellaneous. 
animal, so that when the latter is placed beneath the microscope and 
slightly compressed, they will be seen pressing upon one another in 
such a manner, that if one changes its position, it will be instantly 
occupied by another. Those which are formed last are smallest, but 
they soon gain their full size. 
When the animal feeds, the whole of them are protruded from the 
oral orifice, the longest extending out full one-third the length of 
the body. As they are all convergent to the same orifice, when fully 
protruded the animal becomes puckered up and increased in breadth 
at the expense of the length. In this state the anterior extremity is 
erected and the posterior brought nearly to a right angle with it, so 
that it looks as if sitting upon its prey apparently unconcerned, with 
its proboscides, which writhe and twist about as if they were totally 
distinct organisms. 
If one of these animals be punctured or cut, one or more of the 
proboscides will be immediately protruded as if they existed under 
pressure, and will move about in all directions, appearing as if en- 
tirely without the control of the animal ; or if one of the animals be 
crushed between two slips of glass so that the proboscides will be 
torn from their attachment, they move about involuntarily, always 
in a line forwards or towards the mouth, which they do by contract- 
ing the stomachal extremity towards the oral, the latter remaining 
fixed. In this progressive course they constantly contract and dilate ; 
the mouth opens, and any matter in its vicinity rushes in, when it is 
closed and the matter passes onwards, and by the alternate contrac- 
tion and dilatation of different parts of the same tube, it is thrown 
backwards and forwards several times, and finally violently expelled 
at the torn extremity. When they have escaped from the ruptures 
of the tegument produced by crushing, or when snipped off with a 
pair of scissors whilst an animal is feeding, they will present the 
same curious phsenomena. In fact, these curious independent move- 
ments caused me at first to mistake the organs for viviparous young, 
and it was not until I had frequently observed the animal feeding, 
and examined its structure beneath the microscope, after having fed 
them upon coloured food, that I was convinced of their true nature. 
Excrement! tious matter is expelled from the digestive cavity 
through the same course by which the food enters. 
Circulation . — There appears to be nothing peculiar about the ar- 
rangement of the blood-vessels, if such they be ; the term being ap- 
plied to two semitransparent lines passing along each side of the 
ventral surface, and a third along the middle of the dorsal surface, 
the three freely communicating with each other by transverse lines 
and numerous smaller branches, the whole forming an extensive re- 
ticulation upon the surface of the body. At the anterior part of each 
ventral line, I distinctly observed a dilatation to exist. 
Generative apparatus . — As in all Planarity the animal is androgy- 
nous. The penis is a bulbiform organ placed between the oral and ge- 
nerative orifice, with its point directed towards the latter. The point 
is straight, or contorted ; the bulbous portion is also changeable, 
sometimes elongated, at others flattened or increased in breadth at 
