BY T. HARVEY JOHNSTON. 59 



end is sharply pointed and just near the tip there is a bend 

 and a partial twist. Thus the termination is somewhat 

 sickle-shaped. 



The posterior end of the female may seem, at first 

 sight, to be bluntly rounded but this appearance is due to 

 the bending round of the tiny tail and anal region so as to 

 He more or less closely against the adjacent part of the 

 body, covering the vulva. The anus lies qiiite close to the 

 tip of the tail (.01- 02mm ), the vulva being only .05 to 

 .07mm. from the extremity of the worm. They are much 

 closer than in Travassos' specimens. The single ovary is 

 very long (about 1.5mm.) and the uterus about a millimetre 

 in length. The latter contains eggs which reach the two- 

 celled stage before extrusion. The lower end of the uterus 

 is narrowed and thicker-walled, just before it enters the 

 muscular ovijector. The anterior part of the latter structure 

 is thick-walled and more or less spherical with an outside 

 diameter of .035mm. This is followed b} a wide thick- 

 walled portion, .09-.lOmm. long and .035-.04mm. \vide. 

 The main muscles of the latter are .transversely arranged, 

 while in the spherical part they are more obliquely placed. 

 The terminal portion of the vagina is thin-walled. Eggs 

 measure 50 to 65 micra in length by 30 micra in breadth. 



H. braziliense exhibits most of the characters possessed- 

 by members of the genus Viannaia as given by Travassos, 

 but differs in possessing distinct transverse striation and 

 long spicules. 



Protospirura tKuris Gm. (syn. Spiroptera obfiisa R.). 



The following results were obtained in Sydney- from 

 examinations between August 1909 and February 1910. 

 (Stomach AAorms were found on two occasions in E]). rattus 

 {119 examined) : three times in Ep. norvegicus (121 examined) ; 

 once in Ep. alexandriuus (100 examined) : and seven times 

 in the mouse (73 examined). The percentage was thus 

 approximately 1.6, 2.4. 1 and 9.6. The greatest number 

 obtained dimng the period was 16 (from a mouse). Fifteen 

 were found on another occasion (in a mouse also) and 

 fourteen in Ep. ratfus. but usually only a feAV were present. 



Hall (1916, p. 206) has referred to their abundance in 

 a mouse in U.8.A. One can readilv understand that when 



