In a subsequent communication Mr. Thwaites remarks “that the dorsal longitudinal fascia is of the same width as the lateral ones, and differs only in being perhaps slightly more green; the colour of the three fasciae varies from brownish-yellow to bright green.”  He likewise states “that the rings which compose the body are just 100, and the teeth 70 to 80 in each set, in a single row, except to one end, where they are in a double row.”]

[Footnote 2:  The Minorite friar, ODORIC of Portenau, writing in A.D. 1320, says that the gem-finders who sought the jewels around Adam’s Peak, “take lemons which they peel, anointing themselves with the juice thereof, so that the leeches may not be able to hurt them.”—­HAKLUYT, Voy. vol. ii. p. 58.]

[Footnote 3:  DAVY’S Ceylon, p. 104; MARSHALL’S Ceylon, p. 15.]

[Illustration:  LAND LEECHES.]

One circumstance regarding these land leeches is remarkable and unexplained; they are helpless without moisture, and in the hills where they abound at all other times, they entirely disappear during long droughts;—­yet re-appear instantaneously on the very first fall of rain; and in spots previously parched, where not one was visible an hour before; a single shower is sufficient to reproduce them in thousands, lurking beneath the decaying leaves, or striding with rapid movements across the gravel.  Whence do they re-appear?  Do they, too, take a “summer sleep,” like the reptiles, molluscs, and tank fishes, or may they be, like the Rotifera, dried up and preserved for an indefinite period, resuming their vital activity on the mere recurrence of moisture?

Besides the medicinal leech, a species of which[1] is found in Ceylon, nearly double the size of the European one, and with a prodigious faculty of engorging blood, there is another pest in the low country, which is a source of considerable annoyance, and often of loss, to the husbandman.  This is the cattle leech[2], which infests the stagnant pools, chiefly in the alluvial lands around the base of the mountain zone, to which the cattle resort by day, and the wild animals by night, to quench their thirst and to bathe.  Lurking amongst the rank vegetation which fringes these deep pools, and hid by the broad leaves, or concealed among the stems and roots covered by the water, there are quantities of these pests in wait to attack the animals that approach them.  Their natural food consists of the juices of lumbrici and other invertebrata; but they generally avail themselves of the opportunity afforded by the dipping of the muzzles of the animals into the water to fasten on their nostrils, and by degrees to make their way to the deeper recesses of the nasal passages, and the mucous membranes of the throat and gullet.  As many as a dozen have been found attached to the epiglottis and pharynx of a bullock, producing such irritation and submucous effusion that death has eventually ensued; and so tenacious are the leeches that even after death they retain their hold for some hours.[3]