216 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 50. 



Male 15.2 mm. long and 800 fx thick. The esophagus is 1/4.3 of 

 the entire body length and the tail is 1/15.4 of the entire body length. 

 The cloacal aperture is surrounded by a circular cuticular fold (fig. 

 281). There are a pair of sessile preanal papillae close to the cloacal 

 aperture anteriorly, and an unpaired sessile postanal papilla close to 



the cloacal aperture posteriorly. There are 

 also three pairs of sessile postanal papillae, 

 the last of which is remote from the posterior 

 extrem.ity of the body, and the first two of 

 which are close together. 



Female 24 mm. long and 1.9 mm. thick. 

 The tail is one-sixty-first of the entire body 

 length. The very thick-shelled eggs are 

 elliptical and 49 by 33 fi in diameter. 

 Host. — Epimys rattus {Mus rattus). 

 Location. — Stomach. 

 Locality. — Madagascar. 

 Von Linstow, in his description of this 

 species, notes that the caudal papillae are 

 different from those in Ph. muris-hi'aziliensis. 



Fig. 281.— Physalopteea cik- 

 cuLARis. Posterior ex- 

 tremity OF MALE, VENTRAL 

 VIEW. After von Lin- 

 stow, 1897. 



PHYSALOPTERA RUWENZORII Parona, 1907. 



Specific diagnosis. — Physaloptcra (p. 212) : 

 Body attenuated for a short space anteriorly. 

 Head with lips limiting the large buccal 

 aperture with small papillae on each and without lateral membranous 

 lobes (fig. 282). The teeth are large, conical, and mammilated. The 

 esophagus is one-sixth or more of the entire body length. The in- 

 testine is straight. 



Male 9 to 9.5 mm. long. The copulatory bursa (fig. 283) is large. 

 It comprises a large circular expansion anteriorly, prolonged poste- 

 riorly by a conical portion. The circular anterior 

 portion bears a large sessile unpaired preanal pa- 

 pilla and a large sessile unpaired postanal papilla. 

 The conical posterior portion bears two pairs of 

 large sessile postanal papillae. The spicules are fig. 2S2.-PHYSALor- 

 straight except for a slight curve at the distal ex- J,";,",/^,", 

 tremity. The spicule sheath is imbutiform, with a view, enlarged. 

 circular aperture posteriorly (fig. 283). The testis 

 extends forward to the level of the posterior ex- 

 tremity of the esophagus. Posterior of this point it is looped, but it 

 becomes straight at the anterior origin of the posterior third of the 

 body. 



Female 14 to 17 mm. long. The tail is long, attenuating toward 

 the extremity. The vuh^a is at the union of the anterior and middle 

 third of the bod}'. It has an elevated mar^n and is surrounded by 



After 

 1909. 



Pakona, 



