154 PROCEEDING,"^ OF THE NATIONAL MUSEUM. vol.50. 



Male 4.5 mm. long and 109 \>. thick. Ratio of length to width, 43 : 1. 

 Bursa often outspread, 200 fi long and 400 /* wide, and sustained by 

 six or seven rays. Two filiform spicules 600 fi long. 



Female 6.4 mm. long by 115 [x. thick anteriorly and 118 ju, thick pos- 

 teriorly. Ratio of length to thickness, 53-56 : 1. Tail thin, conical, 

 truncate, mucronate, or terminating in a narrow point, and 23 ju, 

 long. Anus 102 /* from the tip of the tail. Vulva is 380 ^ from the 

 tip of the tail. The single uterus is provided with a muscular 

 ovijector. Eggs 72 to 74 /t long. 



Hosts. — Pitymys suhterraneus {Arvicola suhterraneus) , Apodemus 

 sylvaticus {Mus sylvatlcus) , Eliomys querinus {Myoxus nitella), 

 Dipodillus campestris {Dipodilla campestris) . 



Location. — Intestine. 



Localities. — France (Rennes) , Algeria (high plateaus). 



It is evident from the above description of the female that Du- 

 jardin does not regard the length of the tail and the distance from 

 the anus to the tip of the tail as the same thing. Unless the tail is 

 defined as the portion of the body posterior of the anus, it would 

 seem requisite that some landmark be furnished for the anterior 

 boundary in order to make records of tail lengths of any use. 



H. laeve is recorded from Dipodillus caTnpestris {Dipodilla cam- 

 pestris) in Algeria by Seurat (1914e). 



Since the foregoing was written, a paper by Seurat (1915^) , giving 

 an extended description of this species, has come to hand. Some of 

 the features of his description are: There are 14 longitudinal crests 

 along the body ; the esophagus is short, 420 to 500 \l long ; the male is 

 5 mm. long with a maximum thickness of 130 [jl ; the spicules are 675 {Jt. 

 long and united at their distal extremity ; the gubernaculum is asym- 

 metrical, being prolonged anteriorly on the left side; the female is, 

 6.5 to 8 mm. long with a maximum thiclaiess of 150 [jl, and forms a 

 spiral of 9 turns when removed from the host; caudal extremity of 

 female conical and at times invaginated ; the anus is 80 \i from tiie tip 

 of the tail and the vulva is 70 \i. anterior of the anus ; there is a short 

 cuticular vagina and a simple genital tube ; the eggs have a thin shell 

 and are ovoid, 77 [l by 42 to 45 \i. in diameter, segmenting when ovi- 

 posited. Seurat notes that there are some differences between his 

 measurements and those of Dujardin. He gives an extended descrip- 

 tion of the female genitalia and some good figures. 



HELIGMOSOMUM BRAZILIENSE Travassos, 1914!). 



Specific diagnosis. — Heligiriosomum (p. 140) : Body red. Cuticle 

 with transverse striations and with prominent longitudinal mark- 

 ings. The esophagus is sinuous and is 280 ii long. Head slightly 

 dilated. 



