178 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 50. 



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limgs, liver, and diaphragm, each c,yst containing one or several 

 embryos in its cavity. The presence of a number of these cysts gives 

 the appearance of a miliary tuberculosis and causes a diffuse in- 

 flammation that may result in death. The bronchial mucus is bloody 

 and usually contains a large number of motile embryos. The em- 

 bryos do not grow in the cysts. They become opaque and granular, 

 and finally decompose into an oval or rounded mass containing oily 

 droplets. Obviously, then, the migration into the tissues of the 

 primary host is an accidental matter. The embryos which escape 

 ^ in the feces or in the bronchial mucus carry 



/ on the life cycle. Leuckart fed these to a 



mouse, and at the end of six weeks found the 

 mouse infested with numerous cysts 300 //, in 

 \ diameter in the muscles of the trunk, esopha- 

 gus, and heart and in the connective tissues 

 of the cervical region (fig. 235). The cysts 

 were round, and the worms had undergone 

 some modifications. They were 800 [x long 

 and 40 ju thick. The flesh of a mouse con- 

 taining these cysts was fed to a cat, and at 

 the end of eight days the worms were found 

 in the cecum and colon, but not in the stom- 

 ach, of the cat. They had not, however, un- 

 dergone any modification, which would 

 indicate that possibl}^ they had not developed 

 sufficiently previous to the feeding to be 

 capable of infecting the primary host. 



The adult worm in the cat often occurs in 

 large numbers, causing severe inflammation 

 and ecch3^moses. The effect of the wander- 

 ings and presence of the embr3^os in the 

 musculature must be very similar to that of Ti'ichinella. 



The fact that this worm has a single ovary and is viviparous dis- 

 tinguishes it from the members of such groups as the Strongylinae, 

 to which it might on casual inspection seem closelj'^ related. 



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Fig. 235.— Ollulanus teicus- 

 pis. larvat forms in mus- 

 CLE OF MOUSE. Enlarged. 

 After Leuckart, 1876. 



Superfamily FILARIOIDEA Weinland, 1858. 



Superfamilij diagnosis. — Nematoda (p. 4) : Body usually very 

 long and slender. Mouth with tAvo lips or without lips and sur- 

 rounded by circumoral papillae. Esophagus slender, without poste- 

 rior bulb. Anus subterminal. Male with a single spicule or with 

 two unequal spicules. Tail provided with papillae, usually curved 

 spirally, and with bursal alae present or absent. Female larger than 



