. The Cyathaspididae; a family of Silurian and Devonian jawless vertebrates. Cyathaspididae. orb cd, mdl ldl cd4 ds drs. mo brP lvl bro pbl Fig. 91. Shield and anterior scales of Poraspis (after Kiaer and Heintz, 1935, with modifications). A, dorsal view; B, ventral view; C, lateral view. bro, branchial opening; brp, branchial plate; cd\-i, first to fourth dorsal trans- verse sensory commissures; cso, transverse supraorbital sensory commissure; cvl, lateral ventral transverse sensory commissure; cvm, medial ventral transverse sensory commissure; dls, dorso-lateral scale; drs, median dorsal sca
. The Cyathaspididae; a family of Silurian and Devonian jawless vertebrates. Cyathaspididae. orb cd, mdl ldl cd4 ds drs. mo brP lvl bro pbl Fig. 91. Shield and anterior scales of Poraspis (after Kiaer and Heintz, 1935, with modifications). A, dorsal view; B, ventral view; C, lateral view. bro, branchial opening; brp, branchial plate; cd\-i, first to fourth dorsal trans- verse sensory commissures; cso, transverse supraorbital sensory commissure; cvl, lateral ventral transverse sensory commissure; cvm, medial ventral transverse sensory commissure; dls, dorso-lateral scale; drs, median dorsal scale; ds, dorsal shield; ifc, infraorbital sensory canal; ki-*, positions of inner impressions of gill pouches, numbered according to the theory of Stensio; lap, lateral plate; ldl, lat- eral dorsal sensory canal; lk2-s, position of inner impressions of extrabranchial atria or exhalant ducts; lvl, lateral ventral sensory canal; mdl, medial dorsal sen- sory canal; mo, mouth; mxb, maxillary brim; olp, oral-lateral plate; orb, orbit; orp, oral plate; pbl, postbranchial lobe; pm, pineal macula; pol, postoral sensory canal; pop, preorbital process; ro, rostrum; sec, semicircular canal; soc, supraorbital sensory canal; sop, suborbital plate; vis, ventro-lateral scale; vrs, median ventral scale; vs, ventral shield. 315. 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 Denison, Robert H. (Robert Howland), 1911-1985; Chicago Natural History Museum. Chicago : Chicago Natural History Museum Press
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