1922. 



H. A. Baylis and R. Daubney : Parasitic Nematodes. 



293 



four pairs, one pair of which is large and laterally placed, the remaining three pairs 

 being small and arranged in a triangle on the ventral surface. There is a series 

 of three pairs of preanal papillae on the ventral surface between the cloaca and 

 the posterior margin of the sucker. Near the level of the anterior margin of 

 the sucker is another pair more laterally placed, and finally there is a pair placed 

 anteriorly to the sucker. This last pair may be duplicated (fig. 28). Another varia- 

 tion may be furnished by the presence of an additional pair of papillae in the row 

 between the sucker and the anus (fig. 26). Not infrequently also, the most posterior 

 pair of postanal papillae appears to be absent (fig. 28). The spicules are equal and 

 measure from i'2 to 135 mm. in length. 



An additional character of A. columbae which has, so far as we are aware, hither- 

 to escaped notice, is the presence of 26 to 30 pairs of cervical papillae extending back- 

 wards from near the posterior end of the cephalic alae, the first two or three pairs 

 being situated in the alae. 



The species varies greatly in size, the males in our material measuring from 

 60 to 70 mm. in length and about i-i mm. in thickness; the females from 70 to 95 mm. 

 and up to 2 '5 mm. respectively. 



Ascaridia compar (Schrank, 1790). 

 (Fig. 29.) 



This species has been recorded in Caccabis saxatilis, 

 Coturnix dactylisonans, Coturnix communis, Ortyx virginianus, 

 Perdix cinerea, Tetrao urogallus, T. lagopus, T. tetrix, Gallus 

 gallinaceus, Gallus domesticus, Numida meleagris, and Colinus 

 virginianus. 



We have now to record itd occurrence in the Chakor 

 (Caccabis chucar). 



The material agrees in all essential features with the 

 descriptions given by v. Linstow (1899) and by Müller (1897), 

 though the figures of the tail of the male given by both these 

 authors are not quite accurate. Müller, indeed, describes the 

 post-anal papillae correctly, but his figure fails to indicate 

 clearly the number and arrangement of the small papillae near 

 the tip of the tail. It may therefore not be out of place to 

 give in the present paper a new figure (fig. 29). 



Fig. 29. — Ascaridia com- 

 par. Tail of male ; ventral 

 view. 



Ascaridia cristata (von Linstow, 1901). 

 (Fig. 30.) 

 This species was described by von Linstow from material taken from Balearica 

 regulorum. We have to record its occurrence in the West African crowned crane 

 (Balearica jpavonina*) and in the sarus (Grus antigone). We propose to amplify some- 

 what the original description. 



