65 



Female. Tail, rectilinear, tapering, ending 

 in chitinous spike. Vulva small, not promi- 

 nent, opening in dent of cuticle, beyond the 

 middle part of body, more or less at jun- 

 ction of posterior 1/3 and anterior 2/3. Ovi- 

 jector, short rectilinear, forming acute angle 

 with ventral surface, from vulva onwards, 

 turned to cephalic segment muscular; lumen 

 line with strong chitinous layer separated 

 from horns by transversally Imed sphincter, 

 length: 0,325 mm. Uterus dichotomous, 

 with diverging branches, each one opening 

 into the bottom of ovijector by means of 

 a short very muscular horn. Each uterine 

 branch is provided with a long ovary; the 

 uterine booklets reach to the inner part of 

 of the intestine and spread out near the 

 rectum. Eggs ellipsoid, few in number, with 

 very thin shell, not hatched when laid; 

 length: 0,0T9 mm.; width: 0,045 mm. Anus 

 0,325 mm. from caudal extremity. 



Development. Unknown. 



Origin. Bahia de Guanabara, Rio de Ja- 

 neiro, Brazil. 



Material. Taken from the helmintholo- 

 gical Collection of the Instituto OSWALDO 

 CRUZ. 



We tender our heartiest thanks to Dr. 

 LAURO TRAVASSOS for his account of the 

 helminthological studies made by him in the 

 Island of Trindade, as well as for the excel- 

 lent material he gave us . 



We are also very much indebted to Drs. 

 GOMES DE FARIA and MARQUES DA 

 CUNHA for their help, and for the interest 

 they took in the research work made during 

 my stay on the llha Grande. 



See Portuguese text for 



Bibliography p. 83. 



Explanation of figs. 



p. 87. 



