GONIATITES. 59 



kindred species, but their suture-lines are more undulating and much less oblique, 

 and the lobes are rounded instead of sharp. The central lobe in these two species 

 is apparently much narrower. In G. discoides, Waldsmidt,^ the chambers are 

 much less oblique so that the lateral saddle becomes more evenly concave. Its 

 back is also more rounded and the shell flatter. Like the present form it is a 

 large species. It differs from G. fulguralis in much the same respects, and, 

 moreover, its umbilicus is smaller than in that species. 



Of other less kindred Goniatites, G. Becheri, von Buch., as figured by Beyrich^ 

 is quite separated from ours both by its outward form and its possession of 

 numerous lateral lobes. G. tenuistnatus, d'Arch. and de Vern.,^ is a much flatter 

 shell with its sides more rounded inwards. 



G. Wurmii, F. A. Rom.,* and G. inttimescens, Beyr., as given by Romer,^ though 

 presenting a general likeness, have rounded sides and back, and much hollower 

 lateral saddles. The latter species as given by Tschernyschew^ has a much smaller 

 umbilicus and more evenly arched suture-lines. 



2. Goniatites pulgijealis, n. sp. PI. V, figs. 4, 4 a. 



Description. — Shell of medium size, discoidal, flattish, of three or four very 

 rapidly increasing whorls, half involute. Umbilicus very wide and shallow, about 

 one-third the diameter of the shell, scalariform, showing the dorsal parts of the 

 inner whorls. Sides of the whorls rising steeply from middle of the whorl within, 

 and before reaching their greatest height bending suddenly over, and tending in 

 a slightly convex and oblique direction to the marginal region, where another 

 sudden elbow is formed, after which they turn again suddenly, and form a low, 

 broad, flat, or slightly concave, keel. Just within this elbow a very slight broad 

 depression running round the sides of the whorls. Aperture slightly expanded (?) 

 round the margins, laterally reflexed, and ventrally elongated. 



Surface covered with fine, distant, sharp, elevated threads or striaa, which, 

 starting from the inner elbow, tend at first backward, and then, turning in a 

 sweeping curve forwards, advance obliquely to the outer elbow, where they again 

 bend very suddenly backwards, and are then lost on the sides of the keel, to 



1 1885, Waldsmidt, ' Uber Devou. Schicht. Gegend Wildungeii.,' p. 920, pi. xxxix, figs. 3«, h. 



2 1837, Beyrich, ' Beitr. Ehein. Ubergangsg.,' p. 31, pi. i, figs. 7, 8. 



3 1842, D'Arch. and de Vera., ' Geol. Trans.,' ser. 2, vol. vi, p. 343, pi. xxvi, figs. 7, la. 

 -* 1843, F. A. Eomer, ' Verst. Harz.,' p. 33, pi. ix, fig. 7. 



^ Ibid., p. 33, pi. ix, figs. 8, 9, 15. 



^ 1887, Tschernyschew, ' Mem. Com. Geol. Euss.,' Band iii, pt. 3, p. 168, pi. ii, figs. 3, 5. 



