HOLOTRICHA 



775 



Fig. 329. a, Concophthirus anodontae; b, C. magna, X300 (Kidder); c, 

 Myxophyllum steenstrupi, X280 (Raabe) ; d, Hemispeira asteriasi, X705 

 (Wallengren) ; e, f , Protophrya ovicola (Cepede) (f , a young Littorina rudis 

 with the ciliate); g, h, two views of Ancistruma mytili, X500 (Kidder); i, 

 A. isseli, X500 (Kidder); j, A. japonica, X600 (Uyemura); k, Eupoterion 

 pernix, X500 (MacLennan and Connell); 1, Ancistrina ovata, X630 

 (Cheissin). 



C. magna Kidder (Fig. 329, b). Much larger; 123-204/i by 63-116/*; 

 closer ciliation; anterior 1/3 filled with smaller granules; irregularly 

 outlined macronucleus, 25-30m in diameter, central; 2 (or 1) micro- 

 nuclei; aperture for contractile vacuole large; mantle cavity of El- 

 liptic) complanatus; Massachusetts. 



