DUTROCHET’S LAND LEECH IN ENGLAND. 519 
Leech family, failed to detect these teeth ;* but, as Mr. Jabez 
Hogg has observed,t they are so exceedingly small, when com- 
pared with the size of the animal, that they can only be got out 
with some difficulty, and by a careful, dissection. The parts then 
require to be soaked and prepared in the usual way for mounting 
in balsam, to render them sufficiently transparent for a power of 
150 diameters and upwards. Referring to Moquin Tandon’s figure, 
Mr. Hogg characterizes it as “very inferior; the mouth, jaws, and 
teeth very much more resembling those of the Echini than of the 
ordinary leech.” “The teeth,” he adds, “are placed ina triangular 
form and are hooked and very acute, for grasping and bruising.” 
Mogquin Tandon’s observations of Trochetia lead him to believe 
that it is only semi-terrestrial in its habits, for he succeeded in 
keeping specimens in water for a fortnight in good health. It is 
to be found, he says, in little rivulets and gutters in the fields, 
whence it comes forth occasionally to prey on earthworms, in 
pursuit of which it is almost as voracious as Aulastoma. T 
In regard to its reproduction it is not hermaphrodite, as some 
leeches are said to be, but individuals of both sexes are found. 
The female is oviparous, and forms, in a moist tunnel in the ground, 
a small capsule or cocoon containing numerous ovules, from which 
the embryo leeches are usually hatched at the end of forty days. 
The young leech is white when first hatched, and does not begin to 
acquire colour until some hours afterwards. The perfect colouring 
is not attained for two years. Its first food consists of the mucous 
matters which cover the leaves of aquatic plants; afterwards, when 
its mouth has become more developed, it feeds on the larve of 
insects and other small animals.§ 
The colour of Trochetia seems to vary in individuals, the normal 
coloration being a dull greyish green, with two longitudinal dorsal 
stripes of a brownish shade. Moquin Tandon describes five other 
varieties under the names rufescens, nigricans, brunnea, rubella, 
and carnea, which sufficiently indicate their prevailing tints. 
* «Zand and Water,’ 13th March, 1869. + Id., 17th April, 1869. 
¢ A species of Leech also semi-terrestrial in its habits, coming out of the water and 
hiding under stones on the margins of pools and ponds. It preys largely on worms, 
and can swallow one whole, seizing it by the middle and gulping it down with the 
two halves close together. It frequently, however, cuts them in pieces first. 
§ See Fermond, “Sur Ja Conservation et la Réproduction des Sangsues,’ 
‘Comptes Rendus,’ tome xxxii., p. 719; and Robin’s important work, ‘Sur Je 
Developement Embryogenique des Hirudinées,’ 4to, Paris, 1875. 
