. A manual of zoology. Zoology. Fig. 5S4. Fig. .5*5. Fig. 5.'^4.—Mouth of Pet rant itzon marimis with horny t<^eth and tongue. (From Geeenbaur.) Fig. .'jS5.—Gill apparaius of A/.vj;iiii?f//(. (After J. Miiller.) ir, atrium; ci6. gillarterr and gill arch: 6/-, gill sac (the lines show the gills): ?)»•', efferent canal; c, cesopliageo- cutaneus duct; t/, skin turned away; /, afferent gill canal; o, cesophagus; ^^ mouth of atrium; r, ventricle of heart. opens into a nasal sac, from the bottom of which a canal descends towards the roof of the mouth, ending blindly in Petromyzontes (Ilyp
. A manual of zoology. Zoology. Fig. 5S4. Fig. .5*5. Fig. 5.'^4.—Mouth of Pet rant itzon marimis with horny t<^eth and tongue. (From Geeenbaur.) Fig. .'jS5.—Gill apparaius of A/.vj;iiii?f//(. (After J. Miiller.) ir, atrium; ci6. gillarterr and gill arch: 6/-, gill sac (the lines show the gills): ?)»•', efferent canal; c, cesopliageo- cutaneus duct; t/, skin turned away; /, afferent gill canal; o, cesophagus; ^^ mouth of atrium; r, ventricle of heart. opens into a nasal sac, from the bottom of which a canal descends towards the roof of the mouth, ending blindly in Petromyzontes (Ilyperoartia), or penetrating it in the Myzontes (Uyperotretia), so that an inner nasal ojiening (clioana) occurs. A paired olfac- tory nerve supplies the organ. Sub Class I. Myzontes {Hyperotretia). Semipnrnsitic cyclnstoraes with cirri around the mouth, very primitive nepliridiu, right and left rows of slimc sacs, eyes rudimentary (lens, sclera,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1902
