1922] H. A. Baylis and R. D^ubney: Parasitic Nematodes. 303 



No Oxyuris appears to have been recorded in true lemurs, though two forms, 

 0. corollatus, Schneider, 1866 and 0. coronata, v. Linst., 1903, are recorded in Galeo- 

 pithecus. It is impossible to identify the present material with either of these, both 

 of which have characteristic spinous structures on or near the head. Of the forms 

 found in apes and monkeys, the nearest appears to be 0. anthropopitheci , from the 

 chimpanzee. Both Gedoelst's material and our own has unfortunately consisted only 

 of females, so that the characters available for determination are scanty, and we 

 have been compelled to rely chiefly on measurements. While, therefore, we find a 

 fairly close agreement between our material and Gedoelst's (1916) description, the 

 determination, especially in view of the difference of hosts, can only be regarded as 

 tentative. 



Oxyuris compar, Leidy, 1856 (?). 



A single female, from the intestine of a domestic cat in Calcutta, is doubtfully 

 referred to this little -known and apparently rare species. 



Genus Atractis, Duj., 1845. 



Atractis dactylura (Rud., 1819). 



Examples of this species, all young females, occurred in association with 



Za?iclophorus tempi (see p. 312) in the intestine of Testvdo elongata at Baradighi, 



Jalpaiguri, Bengal. 



Atractis opeatura, Leidy, 1891. 



Syn. A. cruciata, v. Linst., 1902. 



This form occurred in large numbers in the intestine of an iguana* (species not 



mentioned) in the Zoological Garden, Calcutta. Unfortunately, the specimens are in 



rather poor condition and not quite mature. They show no important differences 



from the descriptions furnished by von Linstow ((1901 a) and (1902)) and by Railliet 



and Henry (191 2), except that there is an additional pair of small caudal papillae, 



adanal in position, in the male. 



Note. — Travassos (1920 [?] ) proposes a family Atractidae, which he considers to belong to the super- 

 family Rhabdiasoidea ( = Angiostomoidea). The included genera are Atractis , Ozolaimus , Rondonia . 

 Labiduris, Crossocephalus, Macracis. Cobboldina and Cyrtosomum. These are, for the most part, little, 

 known form?, and in the present unsatisfactory state of our knowledge of the Oxyuridae as a family, and 

 in the absence of a definition of the family Atractidae, we prefer to adopt a conservative attitude as to 

 the position of Atractis. The whole question of the relationships of the Angiostomoidea (or Rhabdia- 

 soidea) is much involved at present ; but it may be remarked, in passing, that the definition of the 

 Angiostomoidea is based mainly on the fact that its species have two heterogenetic generations, and 

 the parasitic phase is without males. This is not known to be the case with the forms included in 

 Travassos' proposed family, though in Atractis dactylura an alternation of generations of a different 

 kind is said to occur (Macé, 1887). Here the females of the parasitic phase are viviparous, and the 

 generation to which they give rise is said to consist entirely of oviparous females. 



Family KATHLANIDAE, Travassos, 1918. 

 Genus Falcaustra, Lane, 1915. 

 The collection includes examples of four species of this genus, all of which appear to 

 be new. The following known species have been assigned to the genus up to the present : 



