. The causes and course of organic evolution; . terms of continued rotifer-molluscanevolution. * In the above connection J. T. Cunningham has recently written mostremarkable is the trochophores resemblance to the adult form of the WheelAnimalcules or Rotifera, which retain the preoral ciliated band as their chieforgan of locomotion and prehension throughout life. Phylogeny of Animals 521 Fig. 23 is a somewhat composite diagram that illustratesdetails common to some rotifers and to gasteropodous, pele-cypodous (lamellibranch), pteropodous, and chitonoid organ-isms. One featm*e alone first deser
. The causes and course of organic evolution; . terms of continued rotifer-molluscanevolution. * In the above connection J. T. Cunningham has recently written mostremarkable is the trochophores resemblance to the adult form of the WheelAnimalcules or Rotifera, which retain the preoral ciliated band as their chieforgan of locomotion and prehension throughout life. Phylogeny of Animals 521 Fig. 23 is a somewhat composite diagram that illustratesdetails common to some rotifers and to gasteropodous, pele-cypodous (lamellibranch), pteropodous, and chitonoid organ-isms. One featm*e alone first deserves consideration, viz.:the primitive or cuticular molluscan shell. This at once sug-gests correlation with the dorsal cuticular lorica of shelledrotifers, and equally with the prodeltidium of dorsal position, even in lamellibranchs, as a median bodyis noteworthy, while the fact that in some existing loricaterotifers there is an expanded dorsal plate only, or a dorsaland ventral plate, or two lateral plates, might indicate that. — soc —mc s9ac
Size: 1382px × 1807px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1900, bookdecade1910, bookidcausescourseofor00macf
