SCLEROSTOMA STRUTHIONIS. 267 



portion of the uterus , which contains eggs in every state 

 of segmentation. 



The uteri are situated parallel to each other along the 

 intestine, exceeding a little the half of the body-length; 

 the eggs, they contain, have a length of 0,072 m.m. 

 With their inferior end the uterine ducts join the two corns 

 of the bifurcated vagina, which is covered with a thick 

 muscular sheath; certainly Schneider^) was not right in 

 regarding this part of the oviduct as an uterus , because , 

 as I indicated before , already a higher situated part of the 

 oviduct contains embryos. The vagina consists of a short com- 

 mon duct and two longer corns , not unlike that of De- 

 letrocephalus dimidiatus Dies. ~) ; each corn is separated by 

 a constriction, nearly on the middle of its length, in an 

 upper and under portion. Only the upper half is coated 

 with the two characteristic layers of crossing diagonal 

 muscles; the lower half, like the common duct, shows 

 only longitudinal muscles, twisted somewhat spirally. The 

 vulva lies 0,5 m.m. from the end of the tail. 



As far as I know, only two species of Strongylids are 

 hitherto known to infest Ostrichs : 1°. Deletrocephalus (Stron- 

 gylus Schn.) dimidiatus Dies. ^) , characterized by its six- 

 lobed mouth-edge , its buccal capsule with longitudinal 

 rows of denticles and its long spicules, measuring 5 m.m., 

 from Rhea americana Lath. ; 2*^. Strongylus Douglassii 

 Cobb. ^) with simple unarmed mouth , with short ('/lo m.m.) , 

 stout spicules, and with a small number of large-sized 

 eggs, from Struthio camelus L. 



1) Schneider, 1. c. p. 258; Leuckart, Die menschliche Parasiten, 1876, 

 p. 431. 



2) Molin , II sottordine degli Acrofalli , Memorie dell* I. R. Istituto Ve- 

 neto. Vol. IX, 1860, p. 427, PI. XXXII, fig. 2. 



3) Diesing , Systema Helminthum, Vol. II, 1851, p. 298; idem, Denk- 

 schriften K. Akad. Wissensch. Wien , Vol. IX , 1855 , p. 183 , PI. VI ; 

 Schneider, 1. c, p. 136, PI. Vlil , fig. 14 and 15; Molin, I.e., p. 567. 



4) Spencer Cobbold , New Entozoon from the Ostrich , Journal Linnean 

 Society, Zoology, Vol. XVI, 1882, p. 184, PI. 4. 



Notes from the Leyden AXuseuin , Vol. VII. 



