. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. NK\\ I' VERTEBRATES 255 elusion, we have only the genus Pnriofic/tns left, and in all its characters, so far as the)' have been developed in tlk,- known species of the genus, the agreement seems sufficiently certain. Six species of ParioticJuts have been described. Of these', /'. bractiy«f>s is excluded by the large maxillary tooth not being below the anterior border of the orbits, but much further forward, by the relative si/e of the orbits, etc. I\ aguti is easily distin- guished by the elongate shape of the hea
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. NK\\ I' VERTEBRATES 255 elusion, we have only the genus Pnriofic/tns left, and in all its characters, so far as the)' have been developed in tlk,- known species of the genus, the agreement seems sufficiently certain. Six species of ParioticJuts have been described. Of these', /'. bractiy«f>s is excluded by the large maxillary tooth not being below the anterior border of the orbits, but much further forward, by the relative si/e of the orbits, etc. I\ aguti is easily distin- guished by the elongate shape of the head, its less depressed form, etc. /'. isoloinns differs distinctly in its less expansion pos- teriorly, its length being distinctly greater than its width, and the absence of a posterior emargination of the cranial border. P. in- cishns has been wrongly identified as having a single row of teeth on mandibles and maxilla? by both Case and myself, whereas Cope distinctly figures it (Trans. Auicr. Pliil. Soc., 1886, p. 290,. FlG. 6. Life restoration of Pariotichus laticeps ; one fourth natural si/e. PI. II., Figs. 4 and 5) as having additional teeth. The form de- scribed by me as Labidosaurus incisivus is therefore something else. P. incisivus is described and figured by Cope as having a purely reticulated sculpture of the skull, which he accepts as of specific value. Our species has the sculpture, distinctly longitudinal, on the upper side of the skull anteriorly at least. P. adiincus is distinguished by the size of the orbits, etc. We have, then, but a single species left, P. ordiuatus Cope, described from such scanty material that it is doubtful if an actual com- parison of the type specimen would resolve doubt as to its identity with the species herein described. Our species may, therefore, be provisionally given the name of P. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
