BEAR ANIMALCULES. 



361 



air-tubes, with four pairs of long legs, into which coecal 

 prolongations of the stomach pass, as seen in Pig. 315. 



Fig. 317. — Milnesivm tardigradum, 

 X 120 times. Z, mouth-parts ; 6, alimen- 

 tary canal ; cm, ovary.— After Doyere. 



Fig. 318.— Carolina scorpion (Buthus 

 Caroliniarms). Natural size. 



The lowest mites comprise remarkable worm-like Acarina, 

 called Lingiiatulina. The young are mite-like, the body 

 spherical, with boring jaws, and two 

 pairs of short-clawed feet. Pentas- 

 toma (Fig. 316) occurs in the lungs 

 and liver of man, and in horses and 

 sheep. 



The Tardigrada or bear animal- 

 cules (Fig. 317) are a step higher 

 in the scale of mite life. In. these 

 singular beings the sexual glands 

 exist in the same individual. 



MacroMotus Americanus Packard 

 is common in sphagnum swamps. 

 Like the Rotatoria, these low mites MagSifleci. 

 are capable of revivifying after being apparently dead and 

 dried up. 



Fig. ZVi.—Chdifercancraides. 



