. Bulletin - United States National Museum. Science. 90 BULLETIN 138, UNITED STATES NATIONAL MUSEUM nearly straight, armed with strong teeth, the median one forming a small rostrum; lateral borders curving regularly inward; hind margin very narrow. Cretaceous; Eocene; Oligocene; Miocene; Pliocene; Recent. Both species here described fall into Fabiani's division Etero- ranina^^ otherwise typical Ranwa. RANINA TEJONIANA, new species Plate 22, figs. 1 and 2 Descriptian.—Csiraijace (pi. 22, fig. 1) very convex from side to side, nearly flat from front to back. Sides of carapace as preserved very a
. Bulletin - United States National Museum. Science. 90 BULLETIN 138, UNITED STATES NATIONAL MUSEUM nearly straight, armed with strong teeth, the median one forming a small rostrum; lateral borders curving regularly inward; hind margin very narrow. Cretaceous; Eocene; Oligocene; Miocene; Pliocene; Recent. Both species here described fall into Fabiani's division Etero- ranina^^ otherwise typical Ranwa. RANINA TEJONIANA, new species Plate 22, figs. 1 and 2 Descriptian.—Csiraijace (pi. 22, fig. 1) very convex from side to side, nearly flat from front to back. Sides of carapace as preserved very arcuate, armed with two depressed spines the origins of which are to be seen on the left side. The posterior of the spines, at the. FIG. 1. R'ANINA TEJONIANA. STERNUM (FIRST SEGMENT AND BPISTERNUM) OF HOLOTYPB, X 3 antero-lateral angle, is smaller than the other; its cross-section is a little more than twice as long as wide, the cross-section of the larger is three times as long as wide, and the distance between them is equal to the length of the smaller cross-section. The longitudinal distance of the posterior end of the base of the posterior spine from the outer orbital angle is greater than the transverse distance of that angle from the line of the greatest width of the carapace. Only two or- bital teeth, the two outermost, are visible; both are truncate, sepa- rated by an open suture, inclined a little inward; outer margin of outer tooth very oblique and slightly convex, a point at its outer corner has been broken off. Similar spines may have been present at the corners of the second tooth. Very little of the true outer surface of the carapace remains; a small piece near the anterior middle is smooth, while another piece ^ Boll. Mus. Civ. Vicenza, vol. 1, 1910, p. 31 ; Atti Accad. Sci. Veneto-Tieutlno- Istriana, ser. 3, anno 3, Padova, 1910, p. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability -
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