486 TARDIGRADA CHAP. 
genus. J. arctomys, Ehrb.; 2. mutabilis, Murray ; £. islandicus, 
Richters ; #. gladiator, Murray; #. wendti, Richters; L. reticulatus, 
Murray; £. othonnae, Richters; £. granulatus, Doy.; E. spitzber- 
gensis, Scourfield ;! H. guadrispinosus, Richters; and £. muscicola, 
Plate, are all British. More than one-half of these species are 
: also Arctic, and £. arctomys is in 
addition Antarctic. In fact, the group 
is’a very cosmopolitan one. The genus 
is also widely distributed vertically, 
specimens being found in cities on the 
sea level and on mountains up to a 
height of over 11,000 feet. 
la. Sub-genus HCHINISCOIDES 
differs from the preceding in the num- 
ber of the claws, the want of definition 
in the dorsal plates, and in being marine. 
The single species /. sigismundi, M. 
Sch., is found amongst algae in the 
North Sea (Ostend and Heligoland). 
2. Genus LYDELLA’?—tThe long, 
thin legs of this genus have two seg- 
ments, and in other respects approach 
the Arthropod limb. Marine. Plate 
suggests the name L. dujardini for the 
single species known. 
3. Genus MACROBIOTUS has a 
aE ae Ae pigmented epidermis, but eye-spots may 
Plate.) ce, Brain ; &, thicken- be present or absent. The eggs are laid 
ie aa Sc renaEN moe one at a time, or many leave the body 
phagus ; p, ‘salivary glands; at once. They are either quite free 
ph, pharynx ; sa, blood cor- . . 
puscles ; st, stomach. or enclosed in a cast-off cuticle. The 
genus is divided into many species 
and shows signs of disruption. They mostly live amongst moss ; 
but JL macronyx, Doy., is said to live in fresh water. The 
following species are recorded from North Britain: J/. ober- 
hdusert, Doy.; M. hufelandi, Schultze; M. zetlandicus, Murray ; 
M. intermedius, Plate; M. angusti, Murray; M. annulatus, Murray; 
1 P. Zool. Soc. 1897, p. 790. 
° Hay, in P. Biol. Soc. Washington, xix., 1906, p. 46, states that the name 
Lydella, Dujardin, is preoccupied, and suggests as a substitute Mierolyda. 
