Ciliophora 335 



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Fig. 7. 1. A-E. Opalina obtrigonoidea Metcalf (after Cosgrove): A. Dia- 

 gram showing about half the actual number of ciliary rows. B. Cross-section 

 showing pellicular grooves and basal granules; cilia omitted; x2160. C. 

 Lateral view, falcular cilia, the fused falcular fibrils, basal granules of 

 somatic cilia; semidiagrammatic. D. Surface view of basal granules and 

 oblique fibrils; pellicular grooves indicated by dotted lines; x2160. E. 

 Anterior end, longitudinal section; two falcular eilia arismg from the 

 falcular fibrils; somatic cilia and their basal granules; xl800. F. Proto- 

 opalina intestinalis (Stein) Metcalf; endoplasmic spherules not shown; x270 

 (after M.). G. Zelleriella truncata Carini, x35 (after C.)- H. Opalina rana- 

 rum (Ehrbg.); length, 62-232/x (after Bhatia and Gulati). I. Protoopalina 

 montana Metcalf, x390 (after M.). J. Cepedea punjabensis Bhatia and 

 Gulati; average, 82x35/x (after B. & G.). 



though the spherules may be involved in synthesis and storage of reserve 

 food (164), the nature and significance of these inclusions are undeter- 

 mined. The presence of an "excretory" canal or vacuoles, as described in 

 Protoopalina intestinalis (151), has not been demonstrated in other 

 species. 



