. Bulletin - United States National Museum. Science. 152 BULLETIN 140, UNITED STATES NATIONAL MUSEUM CONTRACAECUM MICROCEPHALIA (Rudolphi, 1809) Baylis, 1920b Synonyms.—Asca?is microcephala Rudolphi, 1809; Kathleena arc- uata Gedoelst, 1916; C ontracaecum quadricuspe Walton, 1923. Baylis and Daubney have examined the type specimens of Kath- leen® arcuata and find that species identical with Rudolphi's. The present writer considers C. quadricuspe identical also, the descrip- tion given by Walton agreeing closely with that of Gedoelst in all particulars except that the esophageal appendix of G.
. Bulletin - United States National Museum. Science. 152 BULLETIN 140, UNITED STATES NATIONAL MUSEUM CONTRACAECUM MICROCEPHALIA (Rudolphi, 1809) Baylis, 1920b Synonyms.—Asca?is microcephala Rudolphi, 1809; Kathleena arc- uata Gedoelst, 1916; C ontracaecum quadricuspe Walton, 1923. Baylis and Daubney have examined the type specimens of Kath- leen® arcuata and find that species identical with Rudolphi's. The present writer considers C. quadricuspe identical also, the descrip- tion given by Walton agreeing closely with that of Gedoelst in all particulars except that the esophageal appendix of G. quadricuspe is somewhat shorter and the vulva slightly more anterior. Hosts.—Anas boschas, Anas domestica, Ardea cinerea, A. cornata, A. herodias, A. minor, A. nycticorax, A. purpurea, A. species, A. stettaris, Ardeolo grayi, A. rattoides, Botauras mugitans, B. stel- laris, Butorides virescens virescens, Ciconia alba, C. nigra, Herodias. Fig. 222.—Contracaecdm microcethalom. a, Front view of head ; 6, dorsal view of head ; c, male tail ; d, free end of spicule ; e, cross section of spicule. After Gedoelst, 1916 egretta, H. tricolor, Nyctiardea grlsea, Nycticorax europaeus. N. nyctieorase. Location.—Proventriculus and intestine. Morphology.—Contracaecum (p. 146) : Color yellow-white. Cuticle cross-striated; directly behind the head the furrows thus produced are so deep that a shirred appearance results. Mouth with 3 lips and 3 interlabia, all with thick transparent cuticle. Lips equal, on their internal surface a longitudinal furrow; ear-shaped projections anteriorly. Dorsal lip (fig. 222&) with 2 large double papillae, the ventro-lateral lips each with 1 large double papilla. Interlabia of about the same height as the lips, with a free curved internal part which is incised at its summit. No lateral alae. Cervical papillae 400 to 720/* from head end. According to Gedoelst's description (K. arcuata), esophagus to mm. long by 160 to 225/a wide, with an appen
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