NEMATODE GENUS PilYSALOPTERA. 



1071 



Tlie cuticle is finely striated transversely, and is partly reflected 

 over the lips; the cervical papillfe are situated about 100 /^ behind 

 the level of the hind end of the muscular cesophagus, and the 

 excretory pore about 75 /a further back. 



The lips are rounded, and each is surmounted by a single large 

 terminal tooth, no other teeth being present. Externally each 

 lip carries a small subdorsal and subventral papilla. 



The oesophagus forms nearly l/4'6 of the body-length ; its 

 anterior muscular part is thinner than the rest, and it is encircled 

 by the nerve ring in its posterior third ; it forms just less than 

 1/lOth of the whole organ. 



Fe'niale. 



The two specimens measure respectively 7 and 8 mm. long by 

 350 and 860//, broad ; the body is attenuated in its anterior half, 

 and it is terminated behind by a relatively long and bluntly 

 rounded tail, which is turned up dorsally in both specimens ; it 



Text-fio-ure 38. 



JPhysaloptera coluhri (Rud.), Dies. 

 . A = Lateral view of lip. 

 B = Caudal extremitj- of male. (After v. Drasclie.) 



is about l/30th of the body-length, and its caudal pores are 

 situated in its posterior third. The vulva is only very slightly 

 protuberant, and its position divides the body into the ratio of 

 1 : 2'5 ; it leads into a vagina bent on itself and measuring 1^ mm. 

 long by 55 /A thick; the egg-chamber is 320 /a long by 145 /x, in 

 diameter, and is also bent on itself; the following common trunk 

 is of about the same length as the egg-chamber, and is about 

 50 /x broad ; its posterior end divides into two, each of which, 

 after a distance of 240 /x, again divides into two to give rise to 

 the four uteri. 



ISTo eggs were observed, the specimens being immature. 



Male. 



The following description of the male bursa is based on von 

 Drasche's description and dravv^ing, no males being available for 

 personal study. 



