■/ 



Table 7. (Continued) 



27. Parascaris equorum bivalens 2 (rod-shaped) 4 (rod-shaped) present 



28. Parascaris equorum trivalens** 3 (rod-shaped) 6 (rod-shaped) present 



; )6-104 X ---- 1 22 (X = 8) 



9 



X = 1 22-26 



(hybrid) 



29. Passalurus ambiguus 



(Oxyuris ambigua) 



30. Physaloptera turgida 



31. Proleptus robustiis 



(Comilla robusta) 



32 Rhabdias bufonis 



(Rhabditis nigrovenosa) 



33. Rhabdias fulleborni 



4 (tetrads) 



7- 8 (monads) undetermined 7-8 



5 (di-tetrads) 9-10 (dyads) 



8 (tetrads) 16 (monads) 



6 (tetrads) 11-12 (monads) 

 (di-tetrads?) (dyads?) 



6 (tetrads) 11-12 (monads) 



(di-tetrads?) (dyads?) 



absent 18-20 X = 1 2 



undetermined 16 ? 1 



absent 

 absent (?) 



22-24 X = 1* 2 

 22-24 X = 1 2 



34. Rhabditis aberrans 



(female - parthenogenetic) 18 (dyads) 

 (male - non-funtional) 9 (tetrads) 



(var. of R. aspera?) 



7 (tetrads) 

 7 (tetrads) 



35. Rhabditis aspera 



36. Rhabditis pellio Butschli 



(R. maupasi) 



37. Rhabditis pellio Schneider 



38. Rhabditis pellio Schneider 



(mutant parthenogenetic) 



(female ) 14 (dyads) 



18 (monads) 



17-18 (monads) 



13-14 (monads) 



13-14 (monads) 



undetermined 18 X — 1 

 18 X = 1* 



undetermined 13-14 X — 1 

 undetermined 13-14 X = 1 



7 (tetrads) 13-14 (monads) undetermined 13-14 X 



39. Setaria equina 



(Filaria papillosa) 



40. Spirina parasitifera 



41. Spirura talpae 



(Spiroptera strumosa) 



42. Strongylus edentatus 



(Sclerostomum edentatum) 



43. Strongylus equinus 



(Sclerostomum equinum) 



44. Strongylus vulgaris 



(Sclerostomum vulgar e) 



45. Syphacia obvelata 



(Oxyurus obvelata) 



46. Toxocara canis 



( Toxascaris canis) 



47. Toxocara cati 



(Belascaris mystax) 



48. Toxocara vulpis 



(Belascaris triquetra) 



49. Trichosomoides crassicauda 



50. Trichostrongylus tenuis 

 (Strongylus tenuis) 



6 (tetrads) 



7 (compound) 



8 (tetrads) 

 6 (tetrads) 

 6 (tetrads) 

 6 (tetrads) 

 8 (tetrads) 



14 (monads) 

 11-12 (monads) 



undetermined 14 X — 1 

 undetermined 11-12 X — 1 



14 No. "X" 

 (eomp.) 



18 (di-tetrads) 30-36 (dyads) 



9 (tetrads) 18 (monads) 



12 (di-tetrads) 22-24 (dyads) 



4 (di-tetrads) 7- 8 (dyads) 



6 (tetrads) 11-12 (monads) 



14 (compound) absent 

 16 (monads) undetermined 16 



11-12 (monads) absent 11-12 X == 1 



11-12 (monads) absent 



11-12 (monads) absent 

 15-16 (monads) absent 



present 



present 



present 



absent 



undetermined ) 1-12 X z 



Undetermined, 

 but many 



11-12 X = 1 



11-12 X = 1 



15-16 X = 1 



60-72 X = 6 2 



18 X = 1* 1 



44-48 X = 2* 2 



7-8 X = 1 2 



( dyads) 



* A "Y" chromosome has been reported from these species.but the accuracy of the interpretations is questionable. 



**Li (1934, 1937) reports a six-chromosome and a nine-chromosome variety of P. equorum as occurring in Chinese 

 Mongolian horses. He suggests that these either are examples of polyploidy or represent the primitive racial strains 

 of the species that are still found in the most primitive of living horses. Cytological study of the six-chromosome 

 form shows a behavior normal for P. equorum except that the autosomal number present after "diminution" is less 

 than in those found in the better known varieties. 



213 



