AKT. 7 CESTODE PABASITES OF BIRDS — LINTON 71 



Hymenolepis tritesHculata (Fuhrmann) 



143. Scolex ; diameter 0.18 mm., from Fulica americana. 



144. Hook from rostellum ; length 0.039 mm. 



145. Ripe proglottides; breadth 0.50 mm. 



146. Proglottides, ventral view; breadth 0.27 mm., from Marila marila. 



147. Cirrus and cirrus-pouch ; length of cirrus 0.135 mm. 



Hymenolepis, species (Genus Weinlandia, Mayhew, 1925) 



148. Scolex ; diameter 0.19 mm., from Marila marila. 



149. Hooks from rostellum ; length 0.015 mm. 



150. Rostellum ; diameter at circle of hooks 0.054 mm., from Oidemia 



dcglandi. 



151. Hook from rostellum ; length 0.010 mm. 



Plate 11 

 Hymenolepis, species (continued) 

 Fig. 152. Adult proglottis; breadth 1.22 mm. 



Hymenolepis, species from Larus delawarensis 



153. Scolex ; diameter 0.14 mm. 



154. Hooks from rostellum ; length 0.054 mm. 



155. Immature proglottides ; breadth 0.22 mm. 



156. Immature proglottides ; breadth 0.28 mm. 



Hymenolepis, species from Fulica americana 



157. Scolex ; diameter 0.19 mm. 



158. Hook from rostellum ; length 0.036 mm. 



159. Cirrus and cirrus-pouch ; diameter of cirrus-pouch 0.036 mm. 



Rhahdometra similis (Ransom), from Coccyzus americanus 



160. Scolex and portion of strobile ; breadth of scolex 0.25, of neck 



0.22 mm. 



161. Scolex and portion of strobile, slender type ; breadth of scolex 0.22, 



of neck 0.13 mm. 



162. Ripe proglottis ; length 0.98 mm. ; p, parauterine organ. 



163. Cirrus and cirrus-pouch, from transverse section of ripe proglottis ; 



diameter of cirrus-pouch 0.05 ram. 



Diorciiis acuminata Clerc from Marila a.n-rlcana 



164. Scolex ; diameter 0.24 mm. 



165. Hook from rostellum ; length 0.048 mm. 



166. Immature proglottides ; breadth 0.40 mm. 



167. Cirrus; length from base of tumid portion 0.10 mm. 



168. Adult proglottis; breadth 0.63 mm. 



169. Ripe proglottis, ova not yet mature ; breadth 1.05 mm. 



170. Ripe proglottis, ova mature ; breadth 0.60 mm. 



171. Ovum; 0.075 by 0.015 mm. 



