\ 



A70 



polar rings and subpellicular microtubules was present in all of these stages. 

 The conoidal complex was similar in structure to the same organelle of other 

 Sporozoa, The conoidal complex in mono- to quadrinucleate macronuclear 

 schizonts is transformed into an organelle similar to the mucron of some 

 eugregarine. This mucron consists of a specialized' area of the cell membrane 

 from which fine fibers extend into a large vacuole situated directly beneath 

 the cell membrane. The top part of the vacuole is encircled by 2 ring-like 

 structures formed by the dilatation of the original apical rings. The vacuole 

 of the mucron contains many anastomosing protrusions of the cytoplasm, suggesting 

 a nutritional role. The mucron disappears when the schizont reaches the multi- 

 nucleate state. Later the merozoites bud from the surface of the schizont as 

 in the coccidia. Each merozoite again has a conoidal complex, which persists 

 thru the gamont stage and usually serves as the point of contact between 2 gamonts 

 during their pairing. The presence of a conoidal complex thru a major portion 

 of the life cycle, its transformation into a mucron and the mode of formation 

 of merozoites indicate that the Neogregarinida combine the fine structure 

 characters of both the Eugregarinida and tH?" Eucoccida, thereby suggesting a 

 p\ylog^netic relationship between these sporozoans, with the neogregarines 

 as a link between eugregarines and coccidia. 



927. Vickers, D. H., and Mltlin, N. 1966. Changes in nucleic acid content of 

 the boll weevil Anthonomus grandis Boheman during its development. 

 Physiol. Zool. 39: 70-76. 

 The amounts of DNA and RNA present in the boll weevil, Anthonomus grandis Boheman, 

 followed its growth-curve very closely. Maximum quantities and wet weight were 

 attained late in the fourth larval instar. RNA was synthesized during the latter 

 half of the pupal stage at the expense of the tissues. After emergence the 

 amount of DNA was greater In males, but the amourtt of RNA was greater in females. 



