NO. 2131. 



NEMATODE PARASITES OF RODENTS— HALL. 



143 



Aentral rays originate as branches of a thick common stem and 

 diverge from their origin to their termination near the bursa margin 

 (fig. 190). They are unusually large for ventral rays, being longer 

 and thicker than any other rays. The spicules are long and narrow 



(fig. 191). 

 Type-species. — Warrenins quadrivittati Hall, 1916. 



WARRENIUS QUADRIVITTATI 



Hall, 1916, new species. 



Speci-fic diagnosis. — 117//'- 

 7\mius (p. 112) : Cuticle 

 transversely striated on the 

 unilateral cervical mem- 

 brane (fig. 187) ; every- 

 where else longitudinally 

 striated, the striation being 

 continued along the bursal 

 rays. The cervical mem- 

 brane is recurved poste- 

 riorly to form a notch. 



3Iale 6.21 mm. long by 

 112 )u, thick just in front of 

 the bursa. The head is 30 

 [J. in diameter, exclusive of 

 the slight cuticular infla- 

 tion. The cervical mem- 

 brane is 60 /x long. The 

 esophagus is about 215 fi 

 hmg and 17 /x thick near 

 its posterior end. The 

 nerve ring is 130 /x from 

 the anterior end of the 

 bod3\ The structure of the 

 bursal lobes and rays is that 

 giA'en in the generic diag- 

 nosis. The dorsal ray is 

 about 60 fi long. The 

 spicules are 695 /x long and 

 very narrow. One of them 

 terminates in a long fine 

 wavy tip and the other in a 

 bifurcation, the two parts 

 of the bifurcation running 

 nearly parallel, the thicker 

 tending to curve slightl}^ 

 around the thinner. 



Female unknown. 



Fig. 188.— Warrenius quadrivittati. Bur.sa, dorsal view. 

 d., Dorsal ray; c. d., externo-dorsal ray; c. I., externo- 

 lateral ray; I. v., latero-ventral ray; m. I., medio- 

 lateral ray; p. I., postero-lateral ray; v. lobe, ven- 

 tral lobe of bursa; v. v., ventro-ventral ray. En- 

 larged. 



Fig. 189.— Warrenius quadrivittati. Bursa, lateral 

 view. e. I., Externo-lateral ray'; I. v., latero-ven- 

 tral ray; m. I., medio-lateral ray; p. I., postero-lat- 

 EEAL kay; v. v., ventro-ventral ray. Enlarged. 



