224 



Horde um jubatum {Puce, r/raminis). Althougli some search has been made for 

 this plant, I liave never found it in great abundance. Gray's Manual gives the 

 ran^e sandy sea shore, Upper Great Lakes and westward. Bulletin of Indiana 

 Experirae;ital Station, No. 29, reports the plant as frequently occurring along the 

 Wabash River, but rather sparingly. 



The few plants that I have found have their leaves dotted over rather scant- 

 ily with the uredo, and the culms entirely covered with the teleutospores of P. 

 graviijiis, the latter appearing sub-epidermal. 



Traumatropic Curvature of Tendrils. By D. T. McDougal. 



Mechanism of Curvatures of Roots. By D. T. McDougal. 



On the Occurrence of the Russian Thistle (Salsola Kali Tragus) in 

 Wabash County. By Albert B. Ulrey. 



[Abstract.] 

 The Russian thistle is recorded as occurring in two localities near North Man- 

 chester, Ind. One locality is on the Erie R. R., while the other is somewhat 

 more than a half mile from the Big Four road. 



Some Additions to Our Knowledge of the Anatomy and Embryology of 



the HoLOSTOMIDiE. By L. J. ReTTGER. 



[Abstract.] 



The holostomida^ belong to the class of trematodes and to that division of this 

 elass designated as the dif/enea, on account of their passing through two stages, 

 entirely marked off from each other in reaching maturity. They vary in size 

 from almost microscopic forms to forms tive to ten mm. long. The holostomidae 

 are usually parasitic in the intestines of birds, though they have been noted 

 occurring elsewhere. Comparatively few forms are known through all their larval 

 stages, and in some of the few cases apparently known there is still a large element 

 of uncertainty. This, lack of definition is caused by the difficulty of finding the 

 larval forms, and then growing the larvte into the adult parasites. 



During last winter while engaged in studying some forms of distomum, I 

 chanced to find living parasites in the liver of Lymna-a stagnalis innumerable 



