1052 MR. R. J. ORTLEPP ON THE 



The spicules are unequal, tvibular, and end in sharp points ; 

 that of the left side measures 1-89 to 2*17 mm. long by 45 /x broad 

 at its base, that of the right 420 to 490 /x long by 50 fx broad. 



Host : Falco cacMnnans. (Esophagus and stomach. Brazil. 



Type material in bottle 4431 in the Vienna Museum. 



This species occupies an isolated position among the Physa- 

 loptera recorded from birds ; none of these in which the nature 

 of female genitalia is known have the uteri arising from the 

 margin of the egg-chamber in a way similar to that seen in 

 Ph. acuticauda. This peculiarity of the female genitalia allies 

 Ph. acihticauda to Ph. prceputialis v. Linst. and to Ph. ^nalayensis, 

 sp. n., from which species it is, however, very easily distinguished 

 by the very anterior position of its vulva, different arrangement 

 of the male caudal papillee, and difference of the ornamentations 

 on the ventral svirface of the male tail. 



Group Tetradelphys. 

 (19) Physaloptera MORDENsLeiper, 1908. (Text-figs. 27 & 28.) 



For the study of this species, Prof. Leiper kindly placed at my 

 disposal the type males (three specimens) and also two lots of 

 worms collected by Drs. Turner from man in Africa. In addition, 

 six tubes of worms collected by Dr. Davy from African monkeys 

 were also placed at my disposal for comparison and identification ; 

 all these proved to be the same species as that collected from man. 



The cuticle shows a very delicate transverse striation ; in some 

 specimens an additional coarse and irregular ringing, probably 

 due to a certain amount of shrinkage, is present. It is partly 

 reflexed over the lips in some, whereas in others it stops short at 

 the base of the lips. It is somewhat inflated, so that the cervical 

 papillae appear to be lodged in shallow cuticular pits. The 

 cervical yjapillse are situated slightly less than three-quarters of 

 the length of the muscular oesophagus behind the posterior limit 

 of this cesophageal part. The excretory pore opens ventrally 

 from 50 to 100 yu, further back. 



The two lateral lips are large ai:id rounded in lateral view, and 

 are sharply set oW from the body in those worms where the 

 cuticle is not reflected over their bases. Each lip carries a large 

 dome-shaped external papilla on each submediiin line. Four 

 teeth are present on each lip, one outer and three inner ; the 

 outer tooth is large a,nd triangular, and has its tip slightly 

 rounded and recurved outwards. The median inner tooth is 

 very small, and is attached to the base of the outer tooth; it is in 

 the form of a small spike. Leiper states that its inner surface 

 is modified to form a cutting-edge ; to me this surface appeared 

 quite flat, or at most slightly convex inwardly. The two inner 

 lateral teeth are situated in the submedian lines, and are directed 

 inwards ; each is split longitudinally to its base, and is lodged in 

 a slight elevation of the lip. 



