NO. 2131. 



NEMATODE PAEAF^ITEfi OE RODENTS— HALL. 



1Y7 



sirable to separate this species from those properly assignable to the 

 genus Rictularia. 



OLLXJI.i.A.ISriN"^E: Hall, 1916, laew^ snbfaiTiily. 



Subfamily diagnosis. — Metastrongylidae (p. 1G2) : Buccal capsule 

 well developed. Caudal bursa well developed, bilobed, and each lobe 

 supported by six rays. Two short spicules. Vulva a short distance 

 anterior of the anus. One ovary. Viviparous. Development with 

 intermediate host. 



Type-gcmis. — Ollulanvs Leuckart, 1865. 



Genus OLLULANUS Leuckart, 1865. 



Generic diagnosis. — Ollulaninr.e (p. ITT) : Characters of the sub- 

 family. 



Type-species. — OUidamis tricuspis Leuckart, 18G5. 



OLLULANUS TRICUSPIS Leuckart, 1865. 



Speci-fic diagnosis. — Ollulanus (p. ITT) : Small thiclc worms. 

 Esophagus moderately muscular and of granular appearance. 



Male with short, thick, almost straight 

 spicules. Caudal bursa well developed, 

 with two lateral lobes, each supported by 

 six rays. 



Female 1 mm. long. Posterior ex- 

 tremity terminates in three points. 

 Vulva a short distance anterior of anus. 

 One ovary. Viviparous. Embiyos rel- 

 atively large, 320 /x long and 15 jt* thick, 

 of almost uniform diameter throughout, 

 but with the tail prolonged into a wavy 

 appendix (fig. 234). The length of the 

 esophagus in the embryo is equal to a half to a third of the total 

 length of the animal. 



Host. — Mus musculus (for larval worm). Adults in gastric 

 mucosa of cat. 



Location. — INIusculature and connective tissue. 



Localities. — Germany; Washington, District of Columlna. 



Life history. — Of the embryos borne by the viviparous female, 

 some are eliminated in the feces, while others emigrate from the 

 intestine into the tissues of the host in a fashion similar to Tri^cM- 

 nella. The latter form cysts 150 to 200 />i in diameter in the pleura, 



10G00°— Proc.N.M.vol.nO— 10 12 



Fig. 2.j1.— Oi-LtTLANUS tricuspis. 



E M B K Y O . ElvTLARGED. AFTER 



Leuckart, 1S76. 



