HOLOTRICHA 629 



verging toward middle, from which budding takes place sidewise; in 

 the gills of mussels. 



S. dosiniae C. and L. 120iLt by 15-20/x; fixed to the interfilamental 

 space of gills of Dosinia exoleta. 



Family 6 Hypocomidae Biitschli 



Genus Hypocoma Gruber. Cilia confined, or reduced, to hold-fast 

 organella at anterior end, arranged in longitudinal rows; with a suck- 

 ing tentacle which serves probably for obtaining nourishment; cyto- 

 stome apprently vestigial; commensal. The genus had been placed in 

 Suctoria; but Chatton and Lwoff showed that ciliation is lengthwise 

 and not crosswise as in Suctoria. 



H. acinetarum Collin (Fig. 295, g, h). On Acineta papillifera. 



H. patellarum Lichtenstein (Fig. 295, i-k). On the gills of Patella 

 caerulea; about 30;u long. 



H. cardii Chatton and Lwoff. On Cardium edule. 



Genus Hypocomides Chatton and Lwoff. Ovate; slightly flat- 

 tened; anterior end attenuated, a few meridional striae; adoral rows 

 of cilia reduced; commensal in mussels. 



H. zyrphaeae C. and L. 25-30/i by 12-15^; in the gills of Zyrphaea 

 crispata. 



References 



Beers, C. D. 1938 Hysterocineta eiseniae n.sp., an endoparasitic 



ciliate from the earthworm Eisenia lonnhergi. Arch. f. Protis- 



tenk.. Vol. 9L 

 Chatton, E. and A. Lwoff 1926 Diagnoses de cilies thigmotriches 



nouveaux. Bull. soc. zool. Fr., Vol. 51. 

 Cheissin, E. 1931 Infusorien Ancistridae und Boveriidae aus dem 



Baikalsee. Arch. f. Protistenk., Vol. 73. 

 Kahl, a. 1931, 1935 Dahl's Die Tierwalt Deutschlands. Parts 21, 



30. 

 Kidder, G. W. 1933 Studies on Conchophthirus mytili de Morgan. 



I, II. Arch. f. Protistenk., Vol. 79. 

 1933 On the genus Ancistruma Strand (Ancistrum Mau- 



pas). I. Biol. Bull. Vol. 64; 11. Arch. f. Protistenk., Vol. 81. 

 1934 Studies on the ciliates from freshwater mussels. I, II. 



Biol. Bull, Vol. 66. 

 MacLennan, R. F. and F. H. Connell 1931 The morphology of 



Eupoterion pernix gen. nov., sp. nov. Uni. Calif. Publ. Zool., 



Vol. 36. 

 MiYASHiTA, Y. 1933 Drei neue parasitische Infusorien aus dem 



Darme einer Japanischen Siisswasseroligochaete. Annot. Zool. 



Japon., Vol. 14. 

 Stevens, N. M. 1903 Further studies on the ciliate Infusoria, 



Licnophora and Boveria. Arch. f. Protistenk., Vol. 3. 



