HOLOTRICHA 



781 



Fig. 331, a, ventral view of a stained Ancislrocoma pelseneeri, X1120 

 (Kozloff); b, Hypocomagalma pholadidis, X840 (Kozloff); c, ciliature as 

 viewed from right side of Holocoma primigenius, X1130 (Chatton and 

 Lwoff) ; d, ventral view of Insignicoma venusta, X1245; e, Raabella botulae, 

 XI 245; f, Crebricoma kozloffi, X755 (Kozloff). 



G. macomae (C. and L.). Body 33-39^ by 13-18/*; a comparatively 

 voluminous micronucleus; on the gills and palps of Macoma balthica 

 (Chatton and Lwoff, 1950). 



Genus Holocoma Chatton and Lwoff. Cylindrical; ventral surface 

 convex; tentacle at anterior end; 19-23 ciliary rows; 6-10 median 

 dorsal rows relatively short, seven left and six right rows long ; on the 

 gills of mollusks. 



H. primigenius C. and L. (Fig. 331, c). Elongated body 41-59m 

 by 15^; ventral surface convex; elongate macronucleus; on the gills 

 of Macoma balthica (Chatton and Lwoff, 1950). 



