of a termite (Procryptotermes sp.) from Madagascar. 3. Caryococcus dilatator Kirby, 1944. (Univ. Calif. Publ. Zool., 49, 1944, 238.) di.la.ta'tor. L. p. adj. dilahis dilate; M.L. noun dilatator the dilator. Spherules 0.5 micron or less in diameter. Internally differentiated with a stainable granule or stainable region peripherally situated. Parasitic in nucleus and nucleolus. The nucleus becomes greatly enlarged, and the chromatin mostly or entirely disappears. Parasitic in the nucleus of flagellates (Trichonympha chationi and other species of T richonympha) from the intestine of a ter- mite {Glypiotermes iridipennis) from Aus- tralia; also found in other species of ter- mites. 4. Caryococcus invadens Kirby, 1944. (Univ. Calif. Publ. Zool., 49, 1944, 238.) in.va'dens. L. p. adj. invadens invading. Spherules, 1.0 to 1.5 microns in diameter, sometimes arranged in pairs. Often inter- nally differentiated with stainable central or peripheral granules or stained areas. Parasitic in the nucleolus and nucleus. The parasitized nucleolus becomes greatly en- larged and crossed by trabeculae, the nu- cleolus eventually being consumed; the nucleus becomes moderately enlarged, but the chromatin does not disappear. Parasitic in the nucleus of a flagellate {Trichonympha peplophora) from the intes- tine of a termite (Neotermes howa) from Madagascar. 5. Caryococcus nucleophagus Kirby, 1944. (Univ. Calif. Publ. Zool., 49, 1944, 236.) nu.cle.o'pha.gus. L. noun nucleus a small nut, a nucleus; Or. v. phagein to eat; M.L. adj. nucleophagus nucleus-destroying. Spherules with a diameter of about 0.5 micron, sometimes arranged in pairs, some- times with a thicker, crescentic, stainable area of the periphery on one side. Parasitic within the nucleus, lying exteriorly or in- teriorly to the chromatin mass; the chro- matin mass may be diminished in amount but does not disappear; the parasitized nucleus also is not appreciably enlarged. Parasitic in the nucleus of a flagellate (Trichonympha corhula) from the intestines of termites {Procryptotermes sp.) from Madagascar and from three species of Kalotermes from Madagascar. Genus B. Drepanospira de Petschenko, 1911. {Miillerina de Petschenko (not validly published; rejected by author), Cent. f. Bakt., I Abt., Orig., 56, 1910, 90; de Petschenko, Arch. f. Protistenk., 22, 1911, 252; see Editorial Board, Internat. Bull, of Bact. Nomen. and Taxon., 2, 1952, 9.) Dre.pa.no'spi.ra. Gr. noun drepane a sickle; Gr. noun spira spiral; M.L. noun Drepano- spira sickle spiral. Cells incurved in two spiral turns that are not abrupt, one of the ends being pointed, the other a little rounded. No flagella; movement helicoid by means of all the body. No cell division. So-called endospores are formed. Regular spherical colonies are formed by indi- viduals at certain stages of development. The author regards this genus as belonging in the family Spirillaceae between Spiroso7na {= Spirillum) and Microspira (= Vibrio). The type species is Drepanospira muelleri de Petschenko. 1. Drepanospira muelleri de Pet- schenko, 1911. {Miillerina paramecii de Petschenko (name rejected by author). Cent. f. Bakt., I Abt., Orig., 56, 1910, 90; Drepanospira Miilleri (sic) de Petschenko, Arch. f. Protistenk., 22, 1911, 252; also see Kirby, in Calkins and Summers, Protozoa in Biological Research, 1941, 1036; and Bu- chanan, Internat. Bull, of Bact. Nomen. and Taxon.,;?, 1952,9.) mue'lle.ri. M.L. gen. noun muelleri of Muller; named for J. Miiller, who studied ciliates and who directed attention to these parasites of Paramecium. Develop from a group of curved rods in the cytoplasm to a large, ellipsoidal mass
