234 FILAEIOIDEA 



1. Spiroxys Schneider, 1866. 



Lips wide, Avith thickened internal cuticle and a sharp 

 anteriorly directed tooth. Ciiticular coUar rudimentary or 

 absent. Body unarmed. Tail of male alate, with a preanal 

 vesicular swelling and sometimes a preanal sucker-like 

 depression. Eleven pairs of caudal papillae present, of 

 which four are preanal. Spicules subequal. Vulva in middle 

 region of body. Two opposed uterine branches. 



Hab. Stomach of Tortoises. 



Genotype : S. [S2iiro2itera] contorta (Rudolphi, 1819). 



Rudolphi, 1819, Entozoorum Synopsis, 25, 242 ; Schneider, 

 1866, Monographie der Nematoden, 125 ; Baylis & Lane, 1920, 

 Proc. Zool. Soc, London, 248 ; Baylis & Daubney, 1922, Mem. 

 Ind. Mas., vii, 328. 



Appendix to C4nathostomidae. 



The following imperfectly-known genera are provisionally 

 referred to this family. 



a. Ancyracanthus Diesing, 1838. 



Two lateral lips, each bearing a pair of pinnate appendages. 

 Each appendage is comiected with an internal cervical sac. 

 Tail of male with two pairs of large preanal and one pair of 

 small postanal papillae. Spicules long, equal. 



Hab. Alimentary canal of Tortoises. 



Genotype : A. peciinatus Diesing, 1838 (= A. innnaUfidus 

 Diesing, 1839). 



Diesing, 1838, Ber. Versamml. deutsch. Naturf. u. Aerzte in 

 Prag, 189 ; 1839, Ann. Wien. Mus. Naturg., ii, 227 ; v. Drasche, 

 1884, Verh. k. k. Zool.-Bot. Ges., Wien, xxxiii. 111; Baylis 

 & Lane, 1920, Proc. Zool. Soc, London, 305. 



b. Ancyracanthopsis Diesing, 1861. 



Each lip with a large outer and a small iimer tooth. Tail of 

 male with six to seven pairs of papillae. 



Hab. Beneath lining of proventriculus of a Bird. 

 Genotype : A. [Ancyracanthus] bilabicita (Molin, 1860). 



Molin, 1860, Sitz. k. Akad. Wlss.. Wien, xl, 343; Diesing, 

 im\,Sitz. k. Akad. If /.ss., Wien, xlii. 670; v. Drasche, 1884, 

 Verh. k. k. Zool.-Bot. Ges., Wien, xxxiii, 112; Railliet, 1916, 

 Journ. ParasitoL, ii, 99. 



This genus is insufficiently described. The characters 

 mentioned are scarcely sufficient to differentiate it from 



