NO. 2131. 



NEMATODE PARASITE,'^ OF RODENTS— HALL. 



165 



Fig. 211.— Si'NTIIETOCAU- 

 LUS PULMON.iLIS. TaRT 



OF SPICULE. Greatly 



ENLARGED. AFTER 



rASiSERINI, 1884. 



These structures consist of a broad, slightly bent stem, terminating 

 posteriorly in a small, thick end plate. They curve postero-ventrally 

 and are apparently homologous with the single accessory piece of 

 other nematodes. The body terminates posteriorly in a chitinous 

 ring which consists of two arcs, convex postero- 

 laterally, and meeting at an angle in a depression 

 in the mid-dorsal line. 



Female 28 to 58 mm. long and 135 to 151 /x 

 thick. The tail subconical and bluntly pointed. 

 The anus is very close to the tip of the tail (fig. 

 212). The vulva is just 

 anterior of the anus and is 

 200 to 2G0 /. CO from the 

 tip of the tail. The vagina 

 is 2 to 2.4 mm. (?) long. 

 There are two convergent 

 uteri. Eggs are elliptical, 

 very thin shelled, and 92 to 

 118 /I long and G2 to 81 /^ thick. They show no 

 trace of segmentation at o^i position. The em- 

 bryo has a tail prolonged by an undulate 

 appendix. 



Host. — Lepus ewopaeus {Lepus t'lmldus). 

 Location. — Bronchi, bronchioles, and pul- 

 monary parenchyma. 



Localities. — France, Germany, Austria, Italy. 

 Following the views of most other writers, 

 the various species of worms from the lungs of 

 Lepus timidus in Europe, described as stron- 

 gyles, trichosomes, or filariae, have been re- 

 garded here as Synthetocaidus puhvoOncdis. 

 Oryctolagus cuniculus {Lepus cuniculus) has 

 been omitted as a host, following the view ex- 

 pressed by Neveu-Lemaire (1912) that the oc- 

 casional cases of verminous pneumonia in the 

 domesticated rabbit were due to SynthetocauJus 

 Tufcscens. I have accepted this view on his 

 authority, but in the absence of any material 

 it is impossible for me to pass on it one Avay or 

 another. 



Synthctocaulus pidmonalis has received considerable study and is 

 in need of more. Mueller (1889) and Passerini (1884) have made 

 very interesting studies. The measurements given by Mueller and 

 accepted as correct by Doctor (1907) are somewhat puzzling. They 

 are expressed in terms of the symbol (' ' ') commonly used to denote 



Fig. 212.— STNTHETOCAxn-us 

 PULMONAUS. Posterior 

 extremity of female. 

 Enlarged. After Pas- 

 serini, 1884. 



