PARASITES OF PROTOZOA 1091 



Borgert (1897) found parasitized Stkholonche and acanthometrids 

 in the Gulf of Naples and prepared the most complete existing account 

 of the organisms. Although he disagreed with many of Koeppen's inter- 

 pretations and found a large number of nuclei in the outer layer, he 

 nevertheless agreed with him that Amoebophrya is a parasitic suctorian. 



Amoehophrya sticholonchae (Fig. 226A-C) is a common parasite 

 of Stkholonche zanclea in the Mediterranean. Borgert found parasites 



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A ^ ^ -^ C 



Figure 226. Amoebophrya in Radiolaria. A, Stkholonche zanclea containing A. 

 sticholonchae ; B, longitudinal section of A/noebophrya in Sticholonche, and, in lower 

 half of figure, section of host and its central capsule; C, A. sticholonchae emerged from 

 its host; D, A. acanthometrae in Acanthometra serrata. (A-C, after Borgert, 1897; D, 

 after Hertwig, 1879.) 



only in the latter part of March, 1895, though the radiolarian was abun- 

 dant also before and after that period. In its host (Fig. 226A) it is 

 an approximately spherical body, located on the concave side of the 

 capsule, transparent, and pale yellowish in color. Within the sphere 

 is a conical body, the point of which is directed toward the body surface 

 of the host (Fig. 226B). The outer surface of the cone is marked by 

 furrows in a close-set, left-wound spiral. The outer surface of the cone 

 is continuous at its base with the inner surface of the sphere, and the 

 spiral furrow continues on the latter. The form of the parasite in this 

 stage has been compared to that of a half-invaginated glove finger. Bor- 

 gert described a large number of very small nuclei arranged in rows 

 between the furrows. In younger parasites there were fewer nuclei, and 

 in an appendix he reported having found a few individuals with single 



