. Bulletin - United States National Museum. Science. 148 BULLETIN 140, UNITED STATES NATIONAL MUSEUM Chroocephalus ridibundus, Colymbus articus, G. atrigularis, G. nigricans, G. , G. septentrionalis, Fulica leucopt., Haematopus ostralegus, Halieus brasiliensis, Larus argentatus, L, canus, L. fuscus, L. marinus, L. ridibundus, L. tridactylus, Lestris parasitica, L. pomarinus, Merganser castor, Mergus merganser, Microcarbo pygmaeus, Pelecanus americanus, P. conspiciUatus, P. .erythrorhynchos, P. fuscus, P. onocrotalus, P. pygmaeus, P. species, P. trachyrhynchus, Phalacrocorax carbo,
. Bulletin - United States National Museum. Science. 148 BULLETIN 140, UNITED STATES NATIONAL MUSEUM Chroocephalus ridibundus, Colymbus articus, G. atrigularis, G. nigricans, G. , G. septentrionalis, Fulica leucopt., Haematopus ostralegus, Halieus brasiliensis, Larus argentatus, L, canus, L. fuscus, L. marinus, L. ridibundus, L. tridactylus, Lestris parasitica, L. pomarinus, Merganser castor, Mergus merganser, Microcarbo pygmaeus, Pelecanus americanus, P. conspiciUatus, P. .erythrorhynchos, P. fuscus, P. onocrotalus, P. pygmaeus, P. species, P. trachyrhynchus, Phalacrocorax carbo, P. fuscicollis, P. graculus, P. jawanicus, P. pelagicus, P. sulcirostris, P. urile, P. verrucosus, Plotus anhinga, P. lavaiUanti, P. melanog aster, P. novae-hollan- diae, Podiceps auritus, P. cristatus, P. dominicensis, P. minor, P. vigricollis, T achy petes aguila, Uria grylle, U. troile, Utamania torda. Location.âIntestine and, in Pelecanus, the gular pouch. 2 Figs. 21G-217.âContbacaecum spiculigekum. 216, Head. Afteb Linstow, 1000. 217, (I, ESOPHAGCS AND APPENDICES 'â b, MALE TAIL. AFTEK Schneider, 1S6G Morphology.âGontracaecum (p. 146) : Large lips rounded, the outer surface flat, the inner giving off' 2 rounded processes which extend outward and forward, protruding beyond edge of lip. Linstow describes and figures (fig. 216) dentigerous ridges. Inter- labia hook-shaped and bent inward, just slightly shorter than the lips and separated from them by a considerable space. Esophagus 1 or according to other authors 1/8 to 1/9 of total length. Ventriculus indistinct; posteriorly directed appendix to mm. long and up to 720> wide; anteriorly directed cecum very voluminous, elongate cone-shaped (fig. 217<7). Mate 32 to 45 mm. long by 800 to 900,* wide. Tail curled, end- ing in conical point. Cioacal aperture 250/j, from posterior end in small specimens. Spicules, according to Dujardin, 2 mm. long by 330/x wide: according to Linstow, mm. long; the latt
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