422 



THE INFUSORIA 



cluster of delicate suckers. Keproduction is by means of endogenous 

 gemmulae and by external non-ciliated fragments which break off from 

 the lobes and give rise to new individuals. They are found on Anacharis 

 and Myriophyllum. 



Family OPHRYODENDRINA, Stein. Ophryodendron, Clap, and L. 

 The body is usually oval or columnar in shape. It is fixed at the 

 posterior extremity. With or without a peduncle. At the anterior 

 extremity there are one to four processes of the body provided with 

 numerous styliform tentacles. The animal produces by internal 

 gemmation numerous gemmules with peritrichous cilia. O84. Marine. 

 Attached to Hydroids, Algae, and the limbs of Crustacea (Fig. 87). 



FIG. 87. 



1, Dendrosoma radians, Ehrb. 

 An early stage in development, 

 with only a single branch 

 springing from the attached 

 gemmula. x 600. For adult 

 colony see Fig. 32, p. 384. 2, 

 Ophryodendron pedicellatum, 

 Hincks. x 300. 



FIG. 88. 



A specimen of Stylony- 

 chia mytilus, containing a 

 cyst of endoparasitic 

 spores (It) of SphaeropJirya 

 pusilla, Clap, and L. o, a, 

 the two meganuclei. 



Family HYPOCOMINA, Butschli. Plano-convex in shape, with a single 

 sucker on the ventral side. Numerous cilia on the ventral side. Hypo- 

 coma, Gruber. 0'046. On the peduncles of various marine Vorticellids. 



Family URNULINA, Fraipont. Rhynceta, Zenker. (Fig. 13.) Cylindrical 

 in form, with one long sucker. No cilia. 0'09. Freshwater. Attached 

 to the limbs of Cyclops, and the gills of Gammarus. Urnula, Clap, 

 and L. Urceolate test. Body oval or spherical. One or two filiform 

 tentacles. Gemmula holotrichous. '12. On the peduncle of Epistylis 

 plicatilis. Acinetopsis, Robin. Cupuliform test attached by a short 

 peduncle. A single flexible tentacle. -08. On Sertularia. 



Family PODOPHRYINA. Podophrya, Butschli. Pedunculate. Body 

 spherical, with numerous tentacles scattered over its distal surface. A 

 single gemmula formed at a time. -08. Freshwater. Sphaerophrya, Clap, 

 and L. (Figs. 88 and 89.) Non- pedunculate. Spherical in form. 

 Numerous scattered suckers. Sometimes endoparasitic on Paramoecium, 

 Stylonychia, etc. -08. Freshwater. Endosphaera, Engelmann. Life- 

 history little known, but in adult stage probably wholly endoparasitic on 



