. Carnegie Institution of Washington publication. . Figs. 193-195.—Lytoloma jeanesi. Peripherals. Xj. No. 1473 A. M. N. H. l'i;. Rit;ht first peripheral. 194. Section near distal end of first peripheral. 195. Section of sixth ? peripheral. Pit shown hv interrupted line. Accompanying the bones above described is a fragment of a costal which agrees in its dimensions with the one mentioned by Cope. Its width is 90 mm., while the thickness thru the middle of the width is 11 mm. Cope states that the costals showed no sculpture. However, the present costal has its surface broken by numerous pits of
. Carnegie Institution of Washington publication. . Figs. 193-195.—Lytoloma jeanesi. Peripherals. Xj. No. 1473 A. M. N. H. l'i;. Rit;ht first peripheral. 194. Section near distal end of first peripheral. 195. Section of sixth ? peripheral. Pit shown hv interrupted line. Accompanying the bones above described is a fragment of a costal which agrees in its dimensions with the one mentioned by Cope. Its width is 90 mm., while the thickness thru the middle of the width is 11 mm. Cope states that the costals showed no sculpture. However, the present costal has its surface broken by numerous pits of varying form and size, resembling thus closely the costals of Osteopygis erosus. It is probable that the bone belongs elsewhere. The peripheral described above as probably the sixth differs so much from the fifth of /.. angusta that a distinct species is clearly indicated. The ratios of width to length in the two bones are very different. The width of the peripheral of L. angusta is contained in the length about two and a third times; while in that of L. jeanesi the width is contained in the length three and a third times. The results are equally decisive in case both peripherals should happen to be fifths or sixths. It is wholly probable that neither of them can belong farther backward in the series. The various measurements of this bone show that the carapace described by Wieland can not belong to L. jeanesi. Lytoloma wielandi sp. nov. Plate 28, figs. 7, 8; plate 29, fig. t; text-figs. 196, 197. Lytoloma angusta?, WiELAND, Amer. Jour. Sci. (4), XVIII, IQ04, p. 183, plates vi-viii, text-figs. 1-3; Ibid., xx, 1905, p. ^3, fig. 5. Dr. George R. Wieland has, with exprest doubts, referred some lower jaws, the front of a skull, and a carapace of a Lytoloma to /,. angusta. His specimens are in the Yale University collection. The skull bones were secured by Professor O. C. Marsh from the upper Cretaceous greensand bed at Hornerstown, New Jersey. The carapace came from Barnesboro. I
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