NEMATODE PARASITES OF BIRDS 147 



7. Male 26 mm. long, female 30.8 mm. long; cuticle with regularly arranged 



refractile dots ; vulva only 1.59 mm. from head end ; eggs 26/a long by 21/i 



wide Contracaecum rosarium, p. 158. 



Male not over 20 mm. long, female not over 25 mm. long; no dots described 

 in cuticle ; vulva more posterior than above ; eggs at least 55m long 

 by 45/* wide 8. 



8. Esophageal appendix about 500/*, cecum 1.8 mm. long; spicules unequal, 



2.7 and 3 mm. long ; eggs 100/t long by 60/t wide. 



Contracaecum scotti, p. 159. 



Esophageal appendix 720/t or longer, cecum 2.G mm. or longer ; spicules 



equal and either shorter or longer than those above ; eggs not over 6'.*/x 



long by 45/t wide 9. 



9. Tail of female 130//. long ; vulva divides body length in ratio of 9.5 : 10.5 ; tail 



of male S5/i long; spicules 1 mm. long Contracaecum andersoni, p. 149- 



Tail of female 300/t or longer; vulva more anterior than in C. andersoni; 

 tail of male 175/i or longer; spicules 3.6 mm. or longer 10. 



10. Dorsal lip with 2 single papillae; esophageal appendix 720/t to 1.04 mm. 



long; male with 33 pairs of caudal papillae, 5 of which are postanal, the 



most anterior of the 5 being double Contracaecum rodhaini, p. 157. 



Dorsal lip with 2 double papillae ; esophageal appendix not over 730/t long ; 

 male with 24 pairs of caudal papillae, 5 of which are postanal, the third 

 papilla from the posterior end being double. 



Contracaecum magnipapillatum, p. 161. 



11. A gubernaculura present, 120/t long; spicules 1.9 mm. long; eggs 40/t long 



by 32/t wide Contracaecum praestriatum, p. 156. 



Gubernaculum absent or undescribed ; spicules longer than above; eggs 

 larger than above (except possibly in C. tricuspe where not de- 

 scribed) 12. 



12. Male 13.S mm. long ; female 12 to 17.5 mm. long ; interlabia very large, end- 



ing in 3 points ; spicules 4.6 mm. long with curved alae. 



Contracaecum tricuspe, p. 160- 



Male 18 mm. or longer: female 23 mm. or longer; interlabia different from 



above; spicules of different length than above 13. 



13. Esophageal appendix 3 to 4.5 mm. long ; interlabia low and rounded ; anus 



of female 564/t, from caudal extremity Contracaecum ovale, p. 155. 



Esophageal appendix not over 1.9 mm. long ; interlabia different from 

 above; anus of female not over 500/t from caudal end 14. 



14. Vulva of female divides body length in ratio of 5 : 13 ; 7 pairs of postanal 



and 38 to 56 pairs of preanal papillae ; spicules probably 7.2 mm. long. 



Contracaecum spiculigerum, p. 147. 

 Vulva of female divides body length in ratio of 2 : 3 ; not more than 6 pairs 

 of postanal and 20 pairs of preanal papillae : spicules 2.3 to 2.8 mm. 



long Contracaecum microcephalum, p. 152. 



In connection with species of C ontracaecuni, Ascarh kirghisensis 

 (placed by the present writer in Porrocaecum) should be kept in 

 mind as possibly belonging in this genus (see discussion, p. 145). 



CONTRACAECUM SPICULIGERUM (Rudolphi, 1809) Raillet and Henry. 1912 



Synonym. — Ascaris spiculigerum, Rudolphi, 1809. 

 Hosts. — AIca torda, Anas clangvla. Carbo bras-iliens'is, C 

 cormorartus, C. cristatus, C dilophus, (J. graculus, C. pygvweus, 



