. Bulletin of the Buffalo Society of Natural Sciences. Natural history; Science. 299. Fig â >':«. Goniafifes , lutheri (/) â (after Halli tus â Gr. complanata.) No sutures were showu in the original speci- men, which was lost. Sub- sequently the species was re- described in Vol. V. of the Palaeontology of N. Y., and a number of specimens, which Clarke has since shown to belong to different species, were referred to it. The gen- eral characteristics of these s]3ecimens were discoidal form, wide umbilication and fine concentric surface striation, features characteristic, accord- ing to Clark
. Bulletin of the Buffalo Society of Natural Sciences. Natural history; Science. 299. Fig â >':«. Goniafifes , lutheri (/) â (after Halli tus â Gr. complanata.) No sutures were showu in the original speci- men, which was lost. Sub- sequently the species was re- described in Vol. V. of the Palaeontology of N. Y., and a number of specimens, which Clarke has since shown to belong to different species, were referred to it. The gen- eral characteristics of these s]3ecimens were discoidal form, wide umbilication and fine concentric surface striation, features characteristic, accord- ing to Clarke, of the exterior of at least three well-dehned species in these shales. The specimen from the "⢠Portage Group, Eighteen Mile Creek, Lake Erie Shore, X. ;' figured on PI. LXX., Fig. 10, Vol. V., Pal. X. nnd hei-e repro- duced, probably represents a G. lutheri. GoxiATiTES (Maxticoceras*) ixTiMEscExs. Bevricli. (Figs. 235, 236.) G. patersonL Hall. ( Pal. X. Vol. V., , ,Pls,LXXII.,LXXlV. Clarke: Xaples Fauna, p. 42.) Distinguishing Chnracters.âAbout four volutions, the outer embracing the inner to one-half or more of their dorso- Yentral diameter; moderately large umbilicus, exposing all the inner volutions; suture forming a narrow acute lobe near the inner margin, then a broad, oblique semi-elliptical saddle, a second narrow, elongate acute lobe, near the outer margin, and a narrow obtuse sachlle on the perij)hery, with one sideextremelvelongate, and the other vervshort, forming * Manticoceras, Hyatt, " includes species with compressed and often very involute whorls, wliich are, however, directly traceable by the closest gradations into forms with broad whorls, open umbilici, and an aspect similar to that of Anarcestes. The yovmg are invariably less discoidal than in Gephyroceras. the abdomens rounded, and the sides divergent outwardly. * * The adult sutures have the same general aspect as those of liyroceras, but the septa in the co
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