4 PEOCEEDHnTGS of the NATIONAL, MUSEUM vol. 79 : art. 5 



3. Both spicules thick and only slightly unequal; 6 to 8 pairs of postanal 



papillae Acuaria 



Spicules very dissimilar and very unequal ; 5 to 7 pairs of postanal 

 papillae Cheilospirura 



4. Cordons not recurrent, but anastomosing 5 



Cordons recurrent, anastomosing or separate 6 



5. Cuticle raised in front of postcervical papillae to form a large collar or 



sheath ; cordons anastomose on the free posterior border of the 



collar Chevreuxia 



No such sheath or collar present Echinurla 



6. Cordons recurrent but not anastomosing Dispharynx 



Cordons recurrent and anastomosing 7 



7. Cordons form a loop directly after their origin in the head, and not flat 



against body but applied to margin of plates or alae; lateral alae present 



On body Cosmocephalus 



Cordons with loops lacking at their anterior ends, and applied directly to 

 body; no lateral alae Synhimantus 



8. Cephalic ornamentation consisting of a narrow denticulated collar, which is 



the margin of a depression surrounding the head at the base of the lips ; 

 cervical papillae large and crescent-shaped, with numerous teeth. 



Streptocara 



Cephalic ornamentation not in the form of a collar, but of epaulets or alate 



appendages ; cervical papillae not as above 9 



9. Cephalic ornamentation consisting of 4 delicate membranous alae directed 



posteriorly Sciadiocara 



Cephalic ornamentation not as above 10 



10. Cervical papillae tricuspid; body with two rows of posteriorly directed 



hooks Seuratia 



Cervical papillae simple ; no rows of hooks on body 11 



11. Cephalic ornamentation consisting of two crescent-shaped cordons, the free 



edges of which are smooth; no cephalic vesicle E,usguniella 



Cephalic ornamentation consisting of two triangular-shaped cordons, the 

 inner edges of which are dentate; cephalic vesicle present Aviculariella 



REFERENCES 

 Cram, E. B. 



1927. Bird parasites of the nematode suborders Strongylata, Ascaridata, 

 and Spirurata. U. S. Nat. Mus. Bull. 140, xvii-t-463 pp. 444 figs. 

 YoBKE, Warrington, and Maplestone, P. A, 



192G. The nematode parasites of vertebrates, xi+536 pp., 307 figs, 

 London. 



v. a. SOVERNMENT FRINTIN* OFFICE: I9SI 



