48 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 50. 



Location. — Cecum. 



Localities. — Cosmopolitan: Germany, Austria (Trieste), South 

 America (Rio Janeiro), Australia (Brisbane), Africa (Abomey, 

 Dahomey), India, United States (Washington, District of Columbia; 

 Bowie and Bethesda, Maryland; Massachusetts; Wooster, Ohio; 

 Kearney, Nebraska ; Detroit, Michigan ; Idabel, Oklahoma). 



The above calls for some 

 comment. In the first place, 

 I have regarded Heterakis 

 dahomensls Gendre, 1911, as a 

 synonym of Heterakis spu- 

 mosa. Gendre's figures and de- 

 scription seem to warrant this 

 in spite of the fact that there 

 are some discrepancies between 

 his description and that com- 

 monly gi^'en or given in the 

 above notes. His specimens 

 measure a little larger than is 

 usual, but still within the rea- 

 sonable limit of variation. He 

 only figures two papillae on the 

 tail proper, but that may easily 

 be due to errors of observation 

 or even anomalies. The spicule 

 .measurement given by him 

 (400 ]x) is longer than I find it. 

 I find the connection between 

 the vagina and the uteri rather 

 difficult to ascertain; but the 

 point of union appears to be 

 just a little posterior of the 

 vulva. This is approximately 

 where Cobb (1896) states that 

 the vagina and uteri meet in the 

 type species, H. vesicularis., but 

 I have found on dissection that 

 the vagina and ovijector in 

 that species make up a much larger affair extending far posterior of 

 the vulva. Cobb's figuring would make the distance from the vulva 

 to the utero- vaginal union about 340 or 350 [x. In a dissected speci- 

 men I find the actual distance to be 4.472 mm. and something of the 

 same sort may be true of H. spumosa. 



I have also made GangnJeterakis gangula Lane, 1914, a synonym of 

 Lleterakis spumosa. Lane's species was collected from Epimys nor- 



I/I mm. " 



Fig. 54.— Heterakis spumosa. Vulva re- 

 gion OF FEMALE. 



