132 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 50. 



short lobules, each supported by a dorsal ray. Ventro-ventral and 

 latero-ventral rays of each lateral lobe of bursa close together, par- 

 allel. Six supporting rays in each lateral lobe. Medio-lateral and 

 posterolateral rays close together, parallel. Externo-lateral ray 

 distally diverges widely from the other lateral rays. Spicules more 

 than 500 fi in length, slender, tubular, filiform united by a membrane 



^///?X/jS, 



Fig. 164.— Trichostrongt- 

 lu3 deucatus. poste- 

 rior extremity of fe- 

 MALE. X 345. 



Fig. 1G5.— Trichostrongt- 

 Lus delicatus. Body of 



FEMALE IN REGION OF VUL- 

 VA. «(., Uterus. X 102- 



throughout their length, or only in their distal portion. Gubernacu- 

 lum absent. Vulva of female behind the middle of the body. Ovi- 

 jectors well developed. Eggs large, generally over 150 \i. long. 



2'ype-species. — Nematodirus filicoUis (Rudolphi, 1802) Ransom, 

 1907. 



ANALYTICAL KEY TO SPECIES OK NEMATODIKUS. 



Spicules about 1 nun. Ions;; female with ovijectors liaving a combined 

 length of about 400 fi Nematodirus spathigcr,Y>. 133. 



Spicules 3 mm. long or longer; ovijectors having a combined length of 

 900 fi or longer Nematodirus neotoma, p. 136. 



