690 MR JAMES MURRAY ON 
Macrobrotus hufelandi—C. Sou. (1), (14). 
Specific Characters.—Large, dark-coloured, dark granules, in addition to the fat- 
cells, in the body-fluid. Pharynx large, shortly elliptical, with two narrow rods and a 
small nut in each row of thickenings. Teeth large, strong, curved, with strong bearers, 
entering the throat. Claws, two similar pairs, each pair of a longer and a shorter claw 
closely united, the larger claw of each pair with a double point (supplementary claw 
near apex). 
This is the water-bear par excellence, though no doubt the early observers confused 
several species together under this name. It appears to be widely distributed over the 
world, though perhaps less so than was formerly supposed. 
There is a group of species, all very closely related to M. hufelandi, some so closely 
that they can only be distinguished by the different forms of the egg spines. These 
occur all over the world, and have no doubt been often mistaken for M. hufelandi, in 
the absence of eggs. 
One of the largest Tardigrada, attaining to ~) inch (625), and perhaps upwards, 
HKyes are normally present—the blind condition having been described as a distinct 
species (M. schulzet, GREEFF). 
Habitat.—Common in the shallow waters of lakes; in Loch Ness it has been found 
at a depth of 300 feet. Loch Morar; Loch Treig. 
Macrobiotus echinogenitus—RicutTERS. (10), (14), (15). 
Specific Characters.—Hardly distinguishable from M. hufelandi except by the eggs, 
which are covered with conical processes, having acute—often curved—tapering points. 
Those of M. hufelandi have the processes narrower cones, expanding at the apices into 
little discs. 
I have seen only the semplex form of this. The eggs are, however, very abundant 
in Loch Morar. 
Habitat.—Loch Ness, Loch Morar; common. 
Macrobiotus islandicus—Ricuters. (Plate IL. figs. 12a to 12¢.) (18). 
Specific Characters.—Hyaline, except stomach. Teeth strongly curved, with bearers; 
teeth enter the mouth. Pharynx round, two short rods in each row, each about twice 
as long as broad, besides a little round nut attached to the end of the gullet. Claws, 
two unequal pairs, the longer claw of each pair with a supplementary point. Stomach 
cells filled with dark blue granules. 
The eggs were not seen, but Ricutrrs found them in Iceland. 
Loch Ness, common, 1903-4. Not yet seen elsewhere. 
