108 THE AMERICAN MONTHLY [Apr 



specimen which was found by Mr. John A. Shulze who 

 also discovered a variety having two processes atone end 

 and one at the other. There appears to be no special 

 reason why either this form or that known as Tabulina 

 Testudo Brun. should be separated from the genus Bid- 

 dulphia. The hyaline lines are not always definite even 

 in Tabulina testudo, while the variety in which but three 

 processes appear clearly indicates an approach toward the 

 type of Biddulphia. Frontispiece, figs, 'I, 8, X 475. 



All the photographs were made by F. J. Keeley, of 

 Philadelphia, and the plate has been loaned to us by the 

 Philadelphia Academy of Sciences. 



Malaria Parasites Observed at Camp Wikoff. 



DR. JAMES EWING. 



The author made four slides from cases of malaria 

 studied at Camp Wikoff. On the first slide was a mixed 

 infection — the sestivo-autumnal and tertiau malarial para- 

 sites. In the one field were two specimens of tertian 

 ring-shaped organisms and three of the sestivo-autumnal 

 ring-shaped organisms. These specimens were interest- 

 ing as illustrating the differences in the morphology of 

 these two ring-shaped parasites. The tertian rings are 

 coarser than the sestivo-autumnal, although the}'- may be 

 of about the same size. They show a quite distinct and 

 large achromatic spot, two or three times the thickness 

 of the ring. It was probably the nucleus, as it stained 

 with hematoxylin. The sestivo-autumnal ring did not ex- 

 hibit any de;n mstrable achromatic spot of the size of the 

 other. Both the tertian rings showed one or two very 

 fine pigment grains, whereas the early gestivo-auturnnal 

 rings were entirely without pigment — as was usual in the 

 cases of Cuban malaria examined. In the same field of 

 the microscope was a young crescent, thus placing beyond 

 (doubt the question of a mixed infection. 



