. Chordate morphology. Morphology (Animals); Chordata. infraorbital line mandibular arch line hyoid arch line anterior pit line spiraculor line pineal body middle pit line posterior pit line endolymphatic pore ventral sensory line supraorbital line nasal capsule dorsal line lateral line infraorbital line mandibular arch line and pit line. hyoid arch line and accompanying pit line ventral sensory line Figure 13-25. A, arthrodire; B, primitive vertebrate; C, Chondrichthyes, and Osteichthyes. In the heavily armored forms these canals grooved the sur- face of the bone (interareal grooves) or were
. Chordate morphology. Morphology (Animals); Chordata. infraorbital line mandibular arch line hyoid arch line anterior pit line spiraculor line pineal body middle pit line posterior pit line endolymphatic pore ventral sensory line supraorbital line nasal capsule dorsal line lateral line infraorbital line mandibular arch line and pit line. hyoid arch line and accompanying pit line ventral sensory line Figure 13-25. A, arthrodire; B, primitive vertebrate; C, Chondrichthyes, and Osteichthyes. In the heavily armored forms these canals grooved the sur- face of the bone (interareal grooves) or were buried in the bone as in the case of Tremataspis. It was early noted that there were connections between the reticular and sensory-line canal systems, and in fact one is unable to distinguish between "mucous" and sensory canals in Tremataspis, as they are seen in section, for they appear to be parts of a single system. The canals in this genus are di- vided into outer and inner parts by a thin perforated bony septum (Figure 8-26). Among the agnaths there is a great deal of variation in this system ranging from Irregulariaspis and Tremataspis, hav- ing a network of canals in which the sensory lines are straighter and have slit-like openings to the surface of the bone, to most forms having only the sensory lines. In many of the Heterostraci, only the sensory canals are embedded in the bone, but a pattern of interareal grooves suggests the presence of a more superficial reticular system. In some of the heterostracans, the astraspids and amphiaspids, only the sensory canals are indicated by superficial grooves in SENSORY ORGANS 411. 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 Jollie, Malcolm. New York, Reinhold
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