. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 244 F. K. SPARROW, JR. 7. tPetersenia sp. Parasitic in eggs of a microscopic animal (rotifer?), Sheep IVn I'ove, \\Oocls Hole. August. 27, 1(M4. Adherent to filaments of Ccrainiitin liia^limniiii there was an abun- dance of eggs of a microscopic animal, probably belonging to the Rotifcrcc, members of which were swarming in the mount. Some of these were parasitized by a fungus allied to Pcterscnia and Olpidiopsis. The thallus oeeupied the whole of the interior of the egg and at ma- turity was transformed into a single sporang
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 244 F. K. SPARROW, JR. 7. tPetersenia sp. Parasitic in eggs of a microscopic animal (rotifer?), Sheep IVn I'ove, \\Oocls Hole. August. 27, 1(M4. Adherent to filaments of Ccrainiitin liia^limniiii there was an abun- dance of eggs of a microscopic animal, probably belonging to the Rotifcrcc, members of which were swarming in the mount. Some of these were parasitized by a fungus allied to Pcterscnia and Olpidiopsis. The thallus oeeupied the whole of the interior of the egg and at ma- turity was transformed into a single sporangium 50/u, long by 20 ju in diameter. This was provided with 1-3 broad (8/^ in diameter), TKXT 1-13. Figs. 1-<S, J'clcrscnia .Indrcci; Fig. 1, early Mage in the formation of the thalliis in Hctocarf'its, the collapsed cyst of the infecting zotispore and the penetration tube still present, a more mature thallus is seen in the right- hand cell, X 376; Fig. 2, more mature thallus containing characteristic refractive bodies, X 376; Fig. 3, mature, unopened sporangium showing some of the zoospores which are actively moving within it. X 376; Fig. 4. mature sporangium with long extramatrical discharge tube, X 376; Fig. 5, mature resting spore with male cyst adherent to it, X 600: Fig. 6, conjugation of thalli previous to resting spoiv forma- tion, X 525; Fig. 7, immature resting spore with two cystosporcs, which have ap- parently conjugated, attached by a penetration tube to it, X 760; Fig. S. ma- ture resting spore showing interpretation of wall structure, X 600. Figs. 9-11, ( ?)Olpidium sphacellantm; Fig. 9, young, spherical thallus in hair of Sphacelaria, X 525; Fig. 10, young thallus attached to nucleus of host cell, tin- r\st of the in- fecting znospore and penetration tube still persistent, X 525; Fig. 11, interpreta- tion oi two zoospores, free-hand. Fig. 12, Pcterscnia Atidrccl, interpretation of zodspore, free-hand. Fig. 13, Petersenia sp. in egg of rotifer, d
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