NEMATODE GENtrS PHYSALOPTEBA, 10l9 



The eggs are oval and thick-shelled, and are already embryo-^ 

 nated m utero ; they are 50 ju long by 32 /a bi'oad. 



Male. 



The males are also coiled, and the body is attenuated in its 

 anterior third. The specimens examined measured from 25 to 

 32 mm. long by 750 to 875 /* thick. The bursa is relatively 

 narrow and pointed, and three of the four pairs of pedunculated 

 papillae are pre-anal in position. The three pi'e-anal ventral papillas 

 are equidistant from the cloaca, and the central papilla is slightly 

 larger. There are five pairs of post-anal ventral papillas, of which 

 the first two pairs are small and situated in a row immediately 

 behind the a,nus ; the third pair is at the junction of the 1st and 

 2nd sixths of the tail, the fourth at about the middle, and the 

 last at the junction of the 3rd and last quarters of the tail. The 

 ventral surface is covered with longitudinal rows of irregular 

 tubercles. 



The spicules are slightly unequal, of the same thickness, and 

 slightly curved ; both taper to fine points ; the right is 574/* long 

 by 38/A thick at its base, the left is 730/x long by 38'/>i, at its base. 



Host : JVasua narica. Stomach. Brazil. 



Discussion. — The small pair of papillae between the 4th and 

 5th pairs of ventral post-anal papillse described by von Drasche 

 are the openings of the caudal pores. 



Acuities. — See Ph. maxillai'is. 



(4) Physaloptera maxillaris Molin, 1860. (Text-fig. 7.) 



The material examined consisted of the types of this species 

 deposited in bottle 4458 in the Vienna Museum ; the material 

 was in an excellent state of preservation. 



The cuticle is finely striated transversely, and is partly or 

 wholly i"eflected over the lips. The cei^vical papilla? are situated 

 half a millimetre behind the junction of the two oesophageal 

 parts, and the excretory pore about 50 yu further back. 



The lips are rounded or slightl}^ conical; each has two terminal 

 teeth — namely, a large triangular outer tooth with obtuse tip 

 slightly bent outwards, and an inner semi-membranous tooth, 

 tripartite at its free end, and of the same size as the outer tooth. 

 Two large conical papillae are present on the outer surface of 

 each lip. 



The oesophagus is sti^'aight, and thickens gradually towards its 

 posterior end ; in the female it forms ]/5"2 to l/5'4, and in the 

 male l/6th to l/6"4 of the body-length ; its anterior tenth forms 

 the muscular part, which is slightly thinner than the glandular, 

 and is encircled by the nerve cord in its posterior third. 



Female. 



The females are stout, and are attenuated only in their anterior 

 third and tail region ; this latter part tapers abruptly to form 

 a short and pointed tail l/73rd of the body-length, and having 

 its caudal pores situated in its middle. Mature forms vary in 



