NEMATODE GENUS PHYSALOPTERA. 1095 



(64) Physalopxera citilli (Rud., 1819), Hall, 1916. 

 Syn. Spiroptera citilli Rud., 1819. 



Male unknown ; female 7-13 mm. long by 400 /a thick. 



" Body curved. Anterior extremity very slightly attenuated. 

 Head rounded, continuous with the body, and with the cuticle 

 inflated. Mouth with two large lips. Six head papilla, of 

 which there are two conical papillae situated on each side near 

 the angle of contact of the two lips, and one spherical papilla at 

 the base of each lip. Cuticle densely striated transversely. 

 Posterior extremity of female obtuse. Vulva in anterior portion 

 of body." 



Host : Citellus citellus. Stomach. 



Hall (1916) transferred this species to Physaloptera, partly on 

 the opinion expressed by Molin and partly because the description 

 could apply to a member of this genus. I follow both these 

 authorities, and consequently list it as a valid member of the 

 genus Physaloptera. 



(65) Physaloptera pyramidalis v. Linstow, 1879. 



Length of male 18 mm. by 1 mm. thick ; length of female 

 50 mm. X 1'5 mm. thick. 



Two pyramid-like lips, dorsal and ventral in position. Outer 

 tooth pointed, inner tooth of same size and tripartite. (Eso- 

 phagus l/5'7, tail l/28th in male and l/55th in female of body- 

 length. Two pre-anal and two post-anal stalked papillae in 

 caudal extremity of male ; in addition 4 pairs of unstalked 

 papillee, of which one pair is pre-anal and 3 pairs post-anal. 



Vulva at junction of 1st and 2nd body fifths. Eggs very 

 thick-shelled, 42 x 33 /a. 



Host : Choloepus didactylus. " An den Sehnen der Zehen." 

 Surinam. 



This species appears to differ from Ph. papillotruncata by its 

 pointed outer tooth and by the more anterior position of the 

 vulva ; nevertheless I am inclined to think that this species is 

 identical with or a variety of Ph. papillotrtmcata. 



It is possible that von Linstow is mistaken in the position of 

 the lips, and that they are really lateral. 



(66) Physaloptera limbata Leidy, 1856. 



Length '5 inch, breadth "02 inch (6 lines x "25 of a line). 



Mouth two-lipped and surrounded by an elevated linear 

 margin. Caudal extremity of male alated and having four pairs 

 of divergent and stalked papillse. 



Host : Scalops canadensis. Stomach. Philadelphia. 



Molin (1860) lists this species under Sp. Inq. ; however, in 

 view of the fact that there are two lips surrounded by what may 

 be interpreted as a cuticular collar, and that the male bursa is 

 alated and has four (pairs) of stalked papillae, I think there is 

 good ground for supposing that this species is a true Physaloptera, 



73* 



