. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 32. Alimentary canal of Peprilus paru: A = pha- ryngeal sac; B = esophagus; C = stomach; D = pyloric caeca; E :^ intestine. From mm SL specimen (semi- diagrammatic).. serial, and laterally compressed. The teeth of the upper jaw are slightly recurved, either simple and pointed (Fig. 33a), or have three small cusps (Fig. 33b). The teeth of the lower jaw are similar to those of the upper, but have either three cusps (Fig. 33a), or four or five cusps (Fig. 33b), and are not recurved. The jaw apparatus seems s
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 32. Alimentary canal of Peprilus paru: A = pha- ryngeal sac; B = esophagus; C = stomach; D = pyloric caeca; E :^ intestine. From mm SL specimen (semi- diagrammatic).. serial, and laterally compressed. The teeth of the upper jaw are slightly recurved, either simple and pointed (Fig. 33a), or have three small cusps (Fig. 33b). The teeth of the lower jaw are similar to those of the upper, but have either three cusps (Fig. 33a), or four or five cusps (Fig. 33b), and are not recurved. The jaw apparatus seems suited for nip- ping parts from larger objects or for taking small objects whole. The significance of the differences in cusp pattern of the pre- maxillary teeth among the species of Pepri- lus is unknown. No teeth are present on the vomer, palatines, or basibranchials. The gill rakers are long, slender, closely spaced, and beset with small teeth. They appear to serve as an effective screen in preventing small food particles from enter- ing the gill area or from escaping through the opercular opening. However, they do not appear to serve as a straining device. Small differences in the number of gill rakers among the species of Peprilus do not seem sufficient to indicate differences in food habits. The suborder Stromateoidei is character- ized by toothed pharyngeal sacs located immediately behind the last gill arch. Biihler (1930) showed the sacs to be 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. : The Museum
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