THE TARDIGRADA OF THE SCOTTISH LOCHS. 683 
In many respects this seems like the larva of some larger species, but the eggs have 
been frequently seen. It is distinguished mainly by the lack of characters (fringe, 
barbs, setze), which most species have when full grown. No formula of the arrangement 
of the plates can be given, as in the examples observed they were obscurely separated, 
the median plates being especially uncertain, and the separation of the pairs indistinct. 
The number, nine, is that given by Pirate. The whole skin is punctate. There is a 
blunt palp on the fourth leg. 
Loch Ness, frequent, 1904. 
Echiniscus gladiator, 0. sp. (Plate I. figs. 1a to Le.) 
Specific Characters.—Small, yellow or pale red, all minutely punctate. Plates 
obscure, the median slightly developed, the pairs hardly divided. Large median 
recurved spine on anterior edge of second pair of plates. Lumbar plate deeply 
trefoliate. Legs slender, no fringe on last ; inner claws with decurved barb, very strong 
on those of last legs. Eyes clear, not pigmented. 
This is related to H. arctomys, which it resembles in narrow form, slender legs, lack 
of fringe, and minute punctation, and like that it might be a larva. The eggs have not 
been observed in this instance; but it differs markedly from HE. arctomys, the only 
species to which it has any resemblance, not only in the great median spine, but in the 
strong barbs of the last inner claws. 
Length, up to about 31; inch (= 269). 
Among mosses and hepatics from the shores of Burlom Bay, Loch Ness, frequent ; 
in Loch Ness, rare, February 1904. 
Echiniscus mutabilis, n. sp. (Plate I. figs. 2a to 2d.) 
Specific Chauracters.—Fairly large, narrow, yellow, all minutely punctate with 
pellucid dots. Plates many, scarcely of firmer texture than the rest of the tegument 
—partly outlined by folds, partly indicated only by interruption of the dots. Median 
line on most plates caused by cessation of the dots. No fringe on last legs. Inner 
claws with small decurved barb. 
Arrangement of Plates.—(1) Head, entire, with usual six setze and two palps; (2) 
Shoulder, divided in pair or four; (3) Median, triangular, divided in three ; (4) Pair, 
entire; (5) Median, triangular, divided in three; (6) Pair, entire; (7) Median, tri- 
angular, divided in two; (8) Lumbar, divided in five (an anterior pair, and the usual 
trefoil). 
The usual ten plates are present, the additional ones arising from division of these. 
Two varieties are distinguished :—(a) Plates sharply outlined, the lumbar having its 
anterior portion separated as a distinct pair of plates, which partly overlap the posterior 
trefoil; dots comparatively large, regularly spaced. (Plate I. fig. 2a.) (b) Plates 
