LINGUATULINA. 



fifiO 



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 young is born with its full comple- 

 ment of legs, and moults several times 

 before arriving at maturity. 



Mibtfsiwu tardigradum Schrank 

 (Fig. 643, /, mouth -parts ; />, alimen- 

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

 line long ; while Hhnydium t<>*tn<l 

 Doyere (Fig. 644, magnified one hun- 

 dred and twenty times) is another 

 European species. 



MctcrobiotUS . I nn'rif<i- 



ntM Pack, has been discovered in Maine by Rev. 

 W. R. Cross. 



LINUUATULINA. 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 horn}' 

 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, Peiitaxtoma 

 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 sitages encysted in the liver and lungs. In 

 Egypt P. constrictum Siebold is occasionally fatal. 



PYCNOGONID.E Latr. Marine, atracheate mites, with palpi, 

 chelse and four pairs of long legs, into which the stomach 

 sends long caeca. Pycnoyouum pelagicum and Nymphtin 

 are types of the group. 



Fig. 644 a 



