LINGUATULINA. 



Fig. 644 



leg- like process attached to the sides of each ring of the body 

 and ending in a pair of claws) . In size they are microscopic 

 and live in standing water among 

 plants and like the Rotatoria revive 

 after being apparently dead and dried 

 up. They were called Tardigrades 

 from their excessively slow motions. 

 The eggs are very large and are laid 

 by the parent after the last moult ; the 

 young is born with its full comple- 

 ment of legs, and moults several 

 times before arriving at maturity. 

 The eggs of some genera are smooth, 

 while those of Macrobiotus are spher- 

 ical and covered with little knob-like 

 projections. 



Milnesium tardigradum Schrank 

 (Fig. 643, 7, mouth-parts ; 6, alimen- 

 tary canal ; ov, ovary) is a fifth of a 

 line long ; while Emydium testudo Doyere (Fig. 644, magnified 

 one hundred and twenty times) is another European species. 



None have yet been noticed as occurring in this 



country. 



LINGUATULINA. V. Ben. These remarkably worm- 

 like mites in the adult state inhabit the nostrils and 

 frontal sinuses of dogs and wolves, and more rarely 

 of horses and sheep. The larvae, which are like 

 low mites in form, are provided with boring horny 

 jaws and two pairs of small feet armed with sharp, 

 retractile claws. They live in the liver of various 

 animals, where they become encysted, passing 

 through a sort of pupa state. The most common 

 species is here represented (Fig. 644a, Pentastoma 

 tcenioides Rudolphi, from Verrill). The male is 

 .08 inch, and the female, which is oviparous, three 

 or four inches long. It sometimes infests man, 

 living in the early stages encysted in the liver and lungs. In 

 Egypt P. constrictum Siebold is occasionally fatal. 



