. Breviora. 1972 AFRICAN CLUPEID FISH Cephalic laterosensory system (Fig. 2). Cephalic latcrosensory system with supraorbital, infraorbital, mandibulo-preopcrcular, pterotic, opercular, occipital and lateral canals (cf. Wohlfahrt, 1937). A supratemporal branch arises from the supraorbital; in some specimens it appears to enter the occipital canal, but in others it definitely stops short of reaching the occipital canal. Figure 2 is based on a specimen that had a drop or two of Ehrlich's hematoxyUn placed on its head. Of several specimens thus treated, its canals showed up the best. The
. Breviora. 1972 AFRICAN CLUPEID FISH Cephalic laterosensory system (Fig. 2). Cephalic latcrosensory system with supraorbital, infraorbital, mandibulo-preopcrcular, pterotic, opercular, occipital and lateral canals (cf. Wohlfahrt, 1937). A supratemporal branch arises from the supraorbital; in some specimens it appears to enter the occipital canal, but in others it definitely stops short of reaching the occipital canal. Figure 2 is based on a specimen that had a drop or two of Ehrlich's hematoxyUn placed on its head. Of several specimens thus treated, its canals showed up the best. The mandibular portion of the mandibulo-preopercular canal could not be dis- tinguished on this specimen, but it appeared in others. The main canals appear to join in the manner illustrated, but the figure should be used with caution. The canals did not take up stain evenly, and comparisons with less well-stained specimens did not ehminate my reservations about the interpretation. I could find no connections between the laterosensory systems of the two sides of the head. In particular the ethmoidal commissure is absent. Dentition. Premaxillary with four to seven small conical teeth soUdly implanted, and two to four replacement teeth in the gum. supraorbital supratemporal occipital. lateral infraorbital preopercular opercular Figure 2. Thrattidion noctivagiis, cephalic laterosensory canals of 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. , Museum of Comparative Zoology, Harvard University
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