126 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 50. 



to 2 mm. from the tip of the tail. The middle section of the ovi- 

 jector is very short, almost hemispherical. The eggs are ellipsoidal 

 and relatively large, 75 to 80 fi long and -lO to 45 fi thick. 



Hosts. — Oryctolagus cuniculus {Lepus cuniculus), Lepus euro- 

 paeus {Lepus t'lTnldus). 



Location. — Small intestine (duodenum) ; rarely in stomach. 



Locality. — Europe. 



This species has been reported as occasionally causing the death 

 of the host animal. Eailliet (1893) states that it is commonly asso- 

 ciated with Graphidium strigosum in the production of a pernicious 

 anemia. 



TRICHOSTRONGYLUS CALCARATUS Ransom, 19116. 



Specific diagnosis. — Trichostrongylus (p. 124) : 

 Male 4.7 to 6.6 mm. long. Maximum thickness 100 to 130 ii (at 

 base of bursa). Lateral lobes of bursa in preserved specimens 



tightly curled inward so that it is 

 impossible to spread the bursa out 

 flat. Latero-ventral and externo- 

 lateral rays closely approximate to 



e;/ /??.//?./ 



' lOOjuu. ' 



Fig. 152.— Trichostrongylus calcaratus. 

 Bursa. After Ransom, 1911. d.r.. Dorsal 

 rat; e. d., externo-dorsal ray; e. I., ex- 

 terno-lateralray; ^ufi. , portion of guber- 

 nacxjlum; I. sp., portion of left spicule; 

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

 iateralray; p. I., postero-lateral ray; 

 V. V. , ventro-ventral ray. 



lOO/JL. 



Fig. 153.— Trichostrongylus calcaratus. Por- 

 tion OF BURSA showing DORSAL RAY. AFTER 



Ransom, 1911. d. r., Dorsal ray; e. d., Ex- 



TERNO-DORSAL RAY; p. I., PORTION OF POSTERO- 

 LATERAL RAY. 



one another, about equal in thickness, the former slightly the thicker, 

 both much thicker than the other rays (fig. 152). Externo-dorsal 

 ray long, curving dorsad in its distal portion ; proximally it is thick, 

 distally it is very slender. Ventro-ventral ray slender, of about the 

 same thickness as the distal portion of the externo-dorsal ray. Pos- 



