LINGUATULINA. 



669 



leg- like process attached to the sides of eacli ring of the Ijody 

 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 apparentl}' dead and dried 

 up. The}' were called Tardigrades 

 from their excessiA'el}' slow motions. 

 The young is born with its full comple- 

 ment of legs, and moults several times 

 before arriving at maturity. 



Mibtesuan tardigraclum Schrank 

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

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

 line long ; while Emydium testudo 

 Doyere (Fig. 044, magnified one hun- 

 dred and twenty times) is another 

 European species. 



Macrohiotus Amerlca- 



nus Pack, has been discovered in Maine by ilcv, 



W. R. Cross. 



LiNGUATULiNA. V. Beu. Thcse 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, Pentastomd 

 tcpnioides 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 s;tages encysted in the liver and lungs. In 

 Egypt P. constriction Siebold is occasionall}- fatal. 



PvcxoGOXiD.E Latr. Marine, atracheate mites, with ])al))i, 

 clielffi and four pairs of long legs, into Avhich the stoinacli 

 sends long ca>ca. Pycnogo)iu))i 2^GlaificHiti and \j/Hq>/i<>n 

 yi'ossipes are types of the group. 



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