72 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 70 



Plate 12 



Diorchis acuminata (continued) 



Fig. 172. Ventral view of genitalia, whole mount ; camera lucida drawing, 

 Spencer 6/4 mm, 



173. Transverse section, adult proglottis; 0.74 by 0.45 mm. 



Valipora mutahilis, new species from Nycticorax nycUcorax naevliis 



174. Scolex ; diameter 0.20 mm. 



175. Hooks from rostellum ; length 0.030 mm. 



176. Immature proglottides ; breadth 0.48 mm. 



177. Adult proglottis, breadth 0.39 mm. 



178. Adult proglottis, dorsal view ; breadth 0.43 mm. 



(Figs. 176-178, somewhat diagrammatic. The testes were not 

 clearly defined in the whole mounts.) 



179. Ripe proglottis ; breadth 0.46 mm. 



180. Ripe proglottis, immediately preceding the segment sketched in Fig. 



181 ; breadth 0.49 mm. 



181. Posterior proglottis ; breadth 0.49 mm. 



Valipora parvispine, new species, from Gavia immcr 



182. Scolex ; diameter 0.56 mm. 



183. Rostellum, retracted; diameter circle of hooks 0.03, length of hooks 



about 0.010 mm. 



184. Immature proglottides ; breadth 0.30 mm. 



185. Adult proglottis, partly diagrammatic; breadth 0.63 mm. 



186. Transverse section of proglottis ; longer diameter 0.56 mm. 



187. Transverse section of longitudinal muscles ; smaller fascicles on 



cuticular side : camera lucida sketch, Spencer, 6/4 mm. 



Plate 13 

 Gyrocoelia milligani, new species from Crocethia alba 



Fig. 188. Scolex and portion of strobile ; diameter of scolex 0.22 mm. 



189. Scolex ; diameter 0.22 mm. 



190. Proglottides ; breadth 1.40 mm, 



191. Section of basal portion of cirrus-pouch ; 0.21 by 0.17 mm. 



192. Section of cirrus-pouch with retracted cirrus ; 0.19 by 0.15 mm. 



193. Spines from cirrus ; length 0.015 mm. 



Fimbriaria fa^ciolaris (Pallas) from Mergus scrrator 



194. Pseudoscolex and scolex ; length of pseudoscolex 4.6 mm. 



195. Scolex ; diameter 0.10 mm. 



196. Transverse section of proglottis ; longer diameter 1.42 mm. 

 a. Calcai'eous bodies. 



197. Transverse section of ripe proglottis ; longer diameter about 3 mm. 



198. Diagram of genitalia. 



199. Cirrus ; length of spines about 0.006 mm. 



