LIST OF ILLUSTEATIONS. XI 



rage. 



150. Strongylus (Deldrocephalus) hrachjlarmus. Bursa 121 



151. Trichostrong'jlus rdorfacformis. Bursa 125 



152. Trichostrongylus calcaratus. Bursa, f/. r., dorsal ray; e. c/., externo-dorsal 



ray; e. I., externo-lateral ray; gub., portion of gubernaculum ; Z. sp., 

 portion of left spicule; I. v., latero-ventral ray; 711. I., medio-lateral ray; 

 p. I., postero-lateral ray; v. v., ventro-ventral ray 126 



153. Trichostrongylus calcaratus. Portion of bursa showing dorsal ray. d. r., 



dorsal ray; c. d., externo-dorsal ray; p. I., portion of postero-lateral ray. 126 



154. Trichostrongylus calcaratus. Spicules and gubernaculum. yw?)., guberna- 



culum; I. sp., left spicule; r. sp., right spicule 127 



155. Trichostrongylus calcaratus. Posterior extremity of female 128 



156. Trichostrongylus calcaratus. Female in region of vulva ]28 



157. Trichostrongylus pigmcntatus. Bursa, dorsal view 129 



158. Trichostrongylus pigmcntatus. Spicule 129 



159. Trichostrongylus fiberius. Posterior extremity of male 130 



160. Trichostrongylus fiberius. Female 130 



161. Trichostrongylus delicatus. Bursa, dorsal view; J, dorsal ray; c. c?., externo- 



dorsal ray; c. I., externo-lateral ray; gub., gubernaculum; I. v., latero- 

 ventral ray; m. I., medio-lateral ray; p. I., postero-lateral ray 130 



162. Trichostrongylus dclicatus. Bursa, lateral view, d, dorsal ray; e. d., 



externo-dorsal ray; e. I., externo-lateral rays; I. v., latero-ventral ray; 

 m. I., medio-lateral rays; p. I., postero-lateral rays; v. v., ventro-ventral 

 rays 131 



163. Trichostrongrjlus dclicatus. Bursa, latero-ventral view. e. I., externo- 



lateral rays; ^it&., gubernaculum; Z. r., latero-ventral rays; m.Z., medio- 

 lateral rays; p. I., postero-lateral ray; v. v., ventro-ventral rays 131 



164. Trichostrongylus dclicatus. Posterior extremity of female 132 



165. Trichostrongylus dclicatus. Bodyof female in region of vulva, ni., uterus. 132 



166. Ncmatodirus spathiger. Male at right, female at left, vulva 133 



167-168. Ncmatodirus spathiger. 167. Anterior extremity of body. 168. Pos- 

 terior extremity of male, ventral 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; sp., spicules; v. v., 

 ventro-ventral ray 134 



169-171. Ncmatodirus spathiger. 169. Posterior extremity of male, lateral 

 view. 170. Posterior extremity of female, lateral view; an., anus; 

 inf., intestine; oi'., ovary. 171. Body of female in region of vulva, 

 lateral view; c, egg; int., intestine; ovij., 1, terminal portion of ovi- 

 jector; ovij. 2, sphincter of ovijector; ovij. 3, non-muscular portion 

 of ovijector; vuL, vulva 135 



172. Nei7iatodirus neotoma. Anterior extremity of female 136 



173. Nematodijus neotoma. Bursa, dorsal view 136 



174-175. Ncmatodirus neotoma. 174. Bursa, dorso-lateral view. 175. Bursa, 



lateral view; d, dorsal rays; e. d., externo-dorsal rays; e. I., externo- 

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



postero-lateral rays; spic, spicule; v., ventro-ventral ray 137 



176-177. Nematodirus neotoma. Bursa, ventral view; d., dorsal ray; v., the 

 ventral ray systems formed by the closely approximated latero- 

 ventral and ventro-ventral rays. 177. Posterior extremity of male; 

 int. , intestine 137 



178. Nematodirus neotoma. Posterior extremity of female 138 



179. Ncmatodirus neotoma. Vulva 138 



180. Nematodirus neotoma. Ovijectors 138 



