. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. basibranchials ceratohyal epihyal epibranchial suspensory pharyngeals lower pharyngeal pterotic branches of the cephalic laterosen- sory system develop bony canals. The pterotic canal is short, and the frontal canal fails to develop a parietal branch. Parietal canal absent. In all three genera the ventral part of the orbitosphenoid has a posteriorly di- rected process. This process is relatively weak in Landonia. In Phenacohrycon and lotaJmjcon the vertical laminar portion of the supra- occipital is fenestrated. basih
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. basibranchials ceratohyal epihyal epibranchial suspensory pharyngeals lower pharyngeal pterotic branches of the cephalic laterosen- sory system develop bony canals. The pterotic canal is short, and the frontal canal fails to develop a parietal branch. Parietal canal absent. In all three genera the ventral part of the orbitosphenoid has a posteriorly di- rected process. This process is relatively weak in Landonia. In Phenacohrycon and lotaJmjcon the vertical laminar portion of the supra- occipital is fenestrated. basihyal. accessory basibranchial B R basibranchials hypobranchials ,hypohyals ceratohyal epihyal suspensory pharyngeals upper pharyngeals lower pharyngeal. ceratobranchials Figure 19. lotabrycon praecox. Dorsal view of hyoid Figure 20. Pfienacofarycon henni'. Dorsal view of right holf (minus interhyol) and gill arches (branchiostegal rays re- of hyoid (minus interhyol) and gill arches (branchiosfegal moved) ( specimen) rays removed) ( specimen). 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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Keywords: ., bookauthorharvarduniversity, bookcentury1900, booksubjectzoology
