THE TARDIGRADA OF THE SCOTTISH LOCHS. 693 
Habitat.—Frequent in Loch Ness and Loch Morar ; occurring at considerable depths 
in Loch Ness. 
Macrobiotus macronyx—Doy. (Plate III. figs. 16a to 16d.) (2), (11), (12). 
Specific Characters.—The claws of each pair of unequal sizes, independently mov- 
able (5). Teeth and pharynx as in M. hufelandi, but the thickenings are slender rods. 
Two eyes. Numerous eggs laid in the cast skin. 
In a short stream draining Loch Geireann Mill, North Uist, abundant among 
Fontinalis. High tides reach to the spot where it was found, May 1904. 
From a drawing sent to him Ricurers determined the Lake Survey examples to belong 
to this species, but the animal differs in some respects both from Pua‘rn’s description 
and from RicHrers’ own figure (11). The smaller claw of each pair is relatively much 
smaller than Ricurers draws it, and I saw no indication that they were separately 
movable. The lesser claws of all the legs, except the fourth, appeared so reduced and 
closely united to the larger claws as to resemble the barbs of the inner claws of 
Echiniscus. The lesser claws of the fourth pair of legs are considerably larger, but even 
these do not appear to be separately movable. 
Macrobiotus intermedius—PuiatE. (5). 
Specific Characters.—Claws, two similar pairs, strong, one of each pair longer and 
with double point. Pharynx small, round ; no eyes. 
Resembling MW. hufelandi in the form of the claws, and M. oberhduseri in the small 
round pharynx. 
Habitat.—Margin of Loch Ness, frequent. 
Macrobwtus, sp.? (Plate III. figs. 17a to 17¢.) 
Only cast skins enclosing eggs having been seen, the animal cannot be named or 
fully described. It is of moderate size, the whole of the skin covered by a hexagonal 
reticulation, very uniform and regular. Hach hexagon is a slight concavity surrounded 
by a raised edge. ‘There is a boss on each of the last legs. The claws are two pairs of 
nearly equal size, stout, closely united, with no supplementary points. The five egos 
are very small. 
Loch Morar, rare. 
Eecs or Macrosrorus. (Plate IV. figs. 18 to 22.) 
It has been already pointed out that several species related to M. hufelandi lay 
spiny eggs. Rrcwrers supposes that the spiny armature serves to secure dissemination 
through the action of rain. It appears that there are more species of Macrobiotus in 
TRANS. ROY. SOC. EDIN., VOL. XLI. PART III. (NO. 27). 102 
