148 BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



Chroocephalus ridibundus, Colymbus articus, G. atrigularis, G. 

 nigricans, G. ru.fogularis, 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. — Intestine and, in Pelecanus, the gular pouch. 



2/d. 



Figs. 21G-217. — Contbacaecum spiculigekum. 216, Head. Afteb Linstow, 



1000. 217, (I, ESOPHAGCS AND APPENDICES '■ b, MALE TAIL. AFTEK 



Schneider, 1S6G 



Morphology. — Gontracaecum (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 

 1/4.3 or according to other authors 1/8 to 1/9 of total length. 

 Ventriculus indistinct; posteriorly directed appendix 1.2 to 1.86 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, 7.2 mm. long; the latter is 

 more probably correct as the name undoubtedly refers to their being 

 a striking character. Seven pairs of postanal papillae (fig. 2176), 

 4 of them ventral. 3 lateral; preanal papillae vary from 38 to 56 

 pairs. 



