. Bulletin - United States National Museum. Science. THE OPALINID CILIATE INFUSOEIANS. 137 Subfamily Opalininae. We have now come to the multinucleated forms. Of these are two genera; Cepedea^ circular, or nearly so, in cross section Opalina, much flattened. The Opalinae may be divided into two groups: a, spe- cies which are narrow and obovate, like Opalina ohtrigona, and 5, species which are broad, or even nearly round, as Opalino. ranarwn. Cepedea is named after Casimir Cepede, who has done ex- tensive work upon the Ciliata Astomata and whose Avork has emphasized the fact that the old family
. Bulletin - United States National Museum. Science. THE OPALINID CILIATE INFUSOEIANS. 137 Subfamily Opalininae. We have now come to the multinucleated forms. Of these are two genera; Cepedea^ circular, or nearly so, in cross section Opalina, much flattened. The Opalinae may be divided into two groups: a, spe- cies which are narrow and obovate, like Opalina ohtrigona, and 5, species which are broad, or even nearly round, as Opalino. ranarwn. Cepedea is named after Casimir Cepede, who has done ex- tensive work upon the Ciliata Astomata and whose Avork has emphasized the fact that the old family Opalinidae (in the broader sense) is not a natural group, and that the old genus Opalina (includ- ing only my Protoopalina^ Zelleriella, Cepedea, and Opalina) is quite distinct from the other Astomata, being in his usage the only genus in the family Opalinidae. Among the Cepedeas we find consider- able intergradation and many difficul- ties in demarcating species. This is even more true among the Opalinas. In these multinucleated forms the nuclear phe- nomena give us less assistance, for in many species the nuclei rest in the reticu- late condition, as is characteristic of most other animals and plants. As already noted, the size of the nuclei varies with the phj'siological condition, and if there be really " primary " and " secondary " nuclei, these may differ in size. All we can do is to try to present the conditions found and express these in a taxonomic nomenclature which is admittedly tenta- tive, until the life histories of the several species are known, and the races, present doubtless in all, or in most, species, have been studied. Genus CEPEDEA. there ; and. Fig. 102.—Cepedea lanceolata, X 1707 (?) DIAMETERS. (AF- TER Bezzenbekger, 1904.) X CEPEDEA LANCEOLATA (Bezzenberger). Opalina lanceolaia Bezzenbergee (1904), Host.—Rana esculenta, variety chinensis Osborn, from "; 83103—23 10. Please note that these images are extracted fr
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