. Breviora. BREVIORA No. 390. Figure 1. Lateral view of the skull, restored, an, angular; d, dentary; ;', jugal; m, maxilla; po, postorbital; q, quadrate; san, surangular; sq, squa- mosal. The jugal-quadratojugal suture is obscure. X 2/3. Lewisuchus adtnixttis, gen. et sp. nov. Holotype. Museo de La Plata 1964-XI-14-14, consisting of much of the presacral column, part of the skull and jaws, scapu- lororacoids and some limb material, contained in a concretion including also remains of a gomphodont and smaller thecodonts. The specimen was collected from the Ghanares Formation of La Rioja Provinc
. Breviora. BREVIORA No. 390. Figure 1. Lateral view of the skull, restored, an, angular; d, dentary; ;', jugal; m, maxilla; po, postorbital; q, quadrate; san, surangular; sq, squa- mosal. The jugal-quadratojugal suture is obscure. X 2/3. Lewisuchus adtnixttis, gen. et sp. nov. Holotype. Museo de La Plata 1964-XI-14-14, consisting of much of the presacral column, part of the skull and jaws, scapu- lororacoids and some limb material, contained in a concretion including also remains of a gomphodont and smaller thecodonts. The specimen was collected from the Ghanares Formation of La Rioja Province, Argentina, about 4 km north of the mouth of the Chaiiares River. The generic name is in honor of Chief Preparator .\rnold D. Lewis, who discovered the remains during preparation of the nodule containing them. The specific name refers to the mixture of materials in the nodule. DESCRIPTION Skull and jaws (Figs. 1-5). In one portion of the nodule were found the "cheek" region of the skull in articulation ^vith the back end of the mandible, and close by, the occipital plate and basicranium, as well as a limited amount of other skull material. Separately were found an incomplete maxilla with dentition, an appropriate dentary, and a small segment of another maxilla and dentary. Of the skull remains, the region of the left lateral temporal opening is well preserved (Fig. 1). The fenestra is subquadrate in outline, relatively narrow anteroposteriorly, the posterior mar- gin descending \ertically to the region of the jaw articulation. The jugal forms most of the straight lower margin of the skull in this area, the portion preser\'ed running back from the area. 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 Zoolog
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