908 J- Stanford, 



The testes are also small, oblong bodies, witli rounded ends, 

 generally sliglitly larg-er tlian tlie ovary, tlie posterior one, which is 

 on tlie same side as tlie ovary, being tlie larger of tlie two. 



The vitellaria have the usual stnicture and the uterus shows 

 that this species belongs in the series 2, 3, 4, distinct from 1, and 5. 



The one thing that led ine to study every character of this worm 

 was the egg. Even with a medium power of the niicroscope one 

 can notice that it is much larger than in the other species. The 

 commonest measurements gave • 039 X ' 019 mm but variations a 

 little above and below occurred. It is dark-brown, longer than oval 

 and rather flat along the sides, with offen a little thickening in 

 the Shell at the big end. 



3 young specimens, about half-grown, were obtained from a toad, 

 nearly two years ago. They are cylindrical, with the posterior lateral 

 loops of the oviduct shorter tlian in the adult. A still younger worm, 

 2-37 mm long, from the green frog, has its uterus already filled 

 with eggs. 



This species appears to be dosest related to Haematöloechus 

 simüis of Looss. The points of similarity are size, spines, ovary 

 and testes, size of egg. The spines of this, however, extend through 

 the cuticle. The ovary and testes of this do not agree any more 

 closely with the accounts of Looss than do those of Nos. 3 and 5. 

 Notwithstanding the close agreenient in the dimensions of the eggs, 

 those of this species are not so dark, nor do they appear to be of 

 the same shape. They look longer and the point of greatest breadth 

 is nearer the large end. The vitellaria of this worm extend completely 

 into the posterior end of the body — in fact to the end of the 

 intestinal caeca. Diflferences in the shape of the worm and in the 

 foldings of the uterus are shown in the drawing: the anterior end 

 is characteristically narrowed, the lateral folds of the uterus are 

 shorter and the median transverse folds are very marked as compared 

 with H. similis. The hosts are American. 



5. Haematöloechus niedioplexus n, sp, 



(Fig. 5.) 



The species here described occurs, equally abundantly with the 

 last, in Bana vircscens. In the lungs of one frog I found 5-|-4, in 

 another 5+7, in a third 2-1-0. My first examples were obtained 

 from Bufo Icntiginosa, nearly two years ago, wlien, upon first ob- 



