. Bulletin of the Buffalo Society of Natural Sciences. Natural history; Science. 294 volution; nari'ow and profound ninbilicns ; large ventricose living chamber; verv concave septa; large, abruptly expand- ing siphuncle; concentric and radiating lines, and oV)scure low rounded nodes. Found only in the Nautilus bed, near the base of the Hamilton group, in Avery's Creek, and in Erie Cliff. Nautilus (Cextroceras*) makcellexsis. (Yanuxem.) (Fig. 228.) (Pal. N. Y., Yol. Y., Pt. II., p. 428, Pis. LXY., CIX.) Dis tingu isli in o- Chiirncters.— Discoid, somewhat com- pressed, form; contiguous, but not
. Bulletin of the Buffalo Society of Natural Sciences. Natural history; Science. 294 volution; nari'ow and profound ninbilicns ; large ventricose living chamber; verv concave septa; large, abruptly expand- ing siphuncle; concentric and radiating lines, and oV)scure low rounded nodes. Found only in the Nautilus bed, near the base of the Hamilton group, in Avery's Creek, and in Erie Cliff. Nautilus (Cextroceras*) makcellexsis. (Yanuxem.) (Fig. 228.) (Pal. N. Y., Yol. Y., Pt. II., p. 428, Pis. LXY., CIX.) Dis tingu isli in o- Chiirncters.— Discoid, somewhat com- pressed, form; contiguous, but not embracing, volutions; w i d e and deep umbili- cus, exposing en- tire lateral faces of the innei- volu- tions; angularity of margins of Fig. 228. Nautilus marcellensis. A young specimen on . . stone natural size (original) ; adult (after Hall) reduced to VOlutlOUS glVlUg one-fourth natural size. a sub-quadrangu- lar cross-section; septal sutures forming a distinct angular saddle on the umbilical margin, a broad shallow lobe on the lateral face of the volution, a distinct angular saddle on the outer margin, and a rounded lobe on the outer face of the volution; siphuncle near the outer margin of the volutions. Found in the impure limestone band, which forms the dividing line between the u})i)er Marcellus and the Transition shales in Erie Cliff. Note.—This species has heretofore been recorded only from the Goniatite limestone, which forms the dividing line. * Centroceras, Hyatt, "includes Devonian species, with much compressed whorls, -abdomen often hollow, s-ometimes narrow, with one row of tubercles along the edge of the abdomen on either side ; the sutures have deep V-shaped ventral lobes, deep lateral and dorsal lobes : no annular lobes in species observed. The dorsum is frequently gibbous, and has an impressed zone only in the more compressed and more involute ; Type, C. Marcellense. (Gen. Foss. Ceph., p. 283.). Please note that these images are extract
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