486 



TARDIGRADA 



genus. E. arctoviys, Ehrb. ; E. imitabilis, Murray ; E. islanclicus, 

 Eichters ; E. gladiator, Murray ; E. wendti, Eichters ; E. reticulatus, 

 Murray ; E. oihonnae, Eichters ; E. granulatus, Doy. ; E. s^iitzber- 

 gensis, Scourfield ;^ E. quadrisjnnosus, Eichters ; and E. muscicola, 

 Plate, are all British. More than one-half of these species are 



also Arctic, and E. 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 ECHIXISCOIDES 

 differs from the preceding in tlie num- 

 ber of the claws, the want of definition 

 in the dorsal plates, and in being marine. 

 The single species E. sigismvndi, M. 

 Sch., is found amongst algae in the 

 North Sea (Ostend and Heligoland). 



2. Genus LYDELLA"—Th& 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 

 pigmented epidermis, but eye-spdts may 



Plate.) ce, Brain ; k, thicken- be present Or absent. The eggs are laid 



ing of tlie epidermis above i, j.- i ,t i t 



tiie moiitii ; o, egg ; oe, oeso- o^e at a time, Or many leave the body 

 phagus ; ^, ? salivary glands ; at once. They are either quite free 



ph, pharynx ; sa, blood cor- i j ■ ^ cd , • i rni 



puscies; s<, stomach. or cnciosed 111 a cast-off cuticle. Ihe 



genus is divided into many species 

 and shows signs of disruption. They mostly live amongst moss ; 

 but M. macronyx, Doy., is said to live in fresh water. The 

 following species are recorded from North Britain : M. oler- 

 Mtuseri, Doy. ; M. Imfdandi, Schultze ; M. zetlafuliciis, Murray ; 

 M. intermedins, Plate; M. angusti, Murray; 3f. annvlatus, Murray; 



^ 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 Microlyda. 



Fig. 255. — hipha^con chileneitse, 

 Plate, X aljout 100. (From 



