. Bulletin. are drawn to the same scale, thus permitting direct comparisonof figures. SYMBOLS USED c. cuticular .?heath surrounding proboscis hooks eg, cement gland 51, ganglion of central nervous-system gn, giant nucleus I, lemniscus n, neck p. polar prolongation of middle membi-ane cf embryo r, receptacle of the proboscis t, testis July, 1919. Pl^TE XXII* Echinorhunchus thecatus Pig. 1. Optical section of immature male showing general form and arrange-ment of organs. Sexual organs in this individual not mature. Prom intestine ofMicropterus salmoides. Stained with hematoxylin and mounted in d
. Bulletin. are drawn to the same scale, thus permitting direct comparisonof figures. SYMBOLS USED c. cuticular .?heath surrounding proboscis hooks eg, cement gland 51, ganglion of central nervous-system gn, giant nucleus I, lemniscus n, neck p. polar prolongation of middle membi-ane cf embryo r, receptacle of the proboscis t, testis July, 1919. Pl^TE XXII* Echinorhunchus thecatus Pig. 1. Optical section of immature male showing general form and arrange-ment of organs. Sexual organs in this individual not mature. Prom intestine ofMicropterus salmoides. Stained with hematoxylin and mounted in damar. Fig. 2. Profile of dorsal surface of proboscis, showing a single longitudinalrow of hooks. Same individual as shown in Fig. 1. Fig. 3. Embryo from body-cavity of mature female. Pig. 4. Profile of proboscis, ventral surface, showing a single longitudinalrow of hooks. •The scale indicating magnification of Fig. 1 has a value of 1 mm. ; tliat of Fig. 2and 4, mm.; that o* Fig. 3. mm. Plate XXII. Plate XXIII * Fig. 5. Echinorhynchus salvelini. Embryo from body-cavity of gravid female,showing very long polar prolongations of middle membrane. Fig. 6. Echinorhynchus coregoni. Embryo from body-cavity of gravid female,showing short polar prolongations of middle membrane. Fig. 7. Pomphorhynchus btdbocolli. Optical vertical section of immaturemale taken from intestine of Ameiurus neiulosus. Whole mount, stained withhematoxylin and mounted in damar. Fig. 8. P. hulbocolU. Embryo from body-cavity of gravid female taken fromintestine of Ictiobus urns. Fig. 9. Rhadinorhynchus tenuicornis. (Van Cleave, 491Sa.) in all figures except Plate XXIII
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
