File:The evolution of man - a popular exposition of the principal points of human ontogeny and phylogeny (1879) (14775730081).jpg

Identifier: evolutionofmanpo021879haec (find matches)
Title: The evolution of man : a popular exposition of the principal points of human ontogeny and phylogeny
Year: 1879 (1870s)
Authors: Haeckel, Ernst Heinrich Philipp August, 1834-1919
Subjects: Human evolution Embryology, Human Anatomy, Comparative
Publisher: New York : Appleton
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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nt representatives of whichare the members of the much-varied orders of Sharks andRays (Figs. 101, 192). These are followed by a series offurther developed Fish forms, by the sub-class of MucousFishes (Ganoides). The greater number of these have longbeen extinct, and only very few living representatives areknown; these are the Sturgeon and Huso of European seas,the Polypterus of African, and the Lepidosteus and Amiaof American rivers. The earlier abundance of forms belong-ing to this interesting group is, however, proved by theabundance of their fossil remains. From these MucousFishes originated the third sub-class, that of the OsseousFishes (Teleostei), to which belong most extant Fishes, espe-cially nearly all our river fish. Comparative Anatomyand Ontogeny very clearly show that the Ganoids sprangfrom the Selachii, just as the Teleostei sprang from theGanoids. But, on the other hand, a second side-line, orrather the main ascending line of the Vertebrate tribe, EMBRYOS OF SHARKS 113
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Fig. 191. Fig. 192. ii4 THE EVOLUTION OF MAN. Fig. 191.—Embryo of a Shark (Scymnus lichia), seen from ventral side :v, pectoral fins (in front of these five pairs of gill-openings) ; h, ventral fins ;a, anal opening ; s, tail fin ; k, external gill-tufts ; d, yelk-sac (the greaterpart of this has been removed) ; g, eye ; n, nose; m, mouth fissure. Fig. 192.—Developed Man-shark (Carcharias melanopterus), seen fromthe left side : r1 first, r2 second dorsal fin; s, tail fin; a, anal fin; v, pectoralfins ; 7i, ventral fins. developed in another direction from the Primitive Fishes;this line leads upward through the Dipneusta group to theimportant class of Amphibia. This significant relationship between the three groupsof Fishes has been placed beyond all doubt by the re-searches of Gegenbaur on the subject. The lucid discussionon the systematic position of the Selachii: which thatauthor inserted in the introduction to his classic study ofthe head skeleton of the Selachii/ must be regar

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