. The Geology of Minnesota . PLATE XLVIII. 1 Cameroceras proteiformb Hall : 777 (See also plates xlix, i„ li, hi.)An internal cast of a very long siphon, viewed from the siphonal side of theshell; showing- the oblique marks of the septal funnels and the outline of thecontinuous apical sheath. From the Trenton limestone. Wykoff, PLATE XLIX. Page. Fig. 1 Camerocebas, sp 777 A long cylindrical sipho, with very broad septal funnels; representing a distinctbut otherwise unknown the Trenton limestone, Cannon Falls, Minn. This specimen may be advantageously compared with
. The Geology of Minnesota . PLATE XLVIII. 1 Cameroceras proteiformb Hall : 777 (See also plates xlix, i„ li, hi.)An internal cast of a very long siphon, viewed from the siphonal side of theshell; showing- the oblique marks of the septal funnels and the outline of thecontinuous apical sheath. From the Trenton limestone. Wykoff, PLATE XLIX. Page. Fig. 1 Camerocebas, sp 777 A long cylindrical sipho, with very broad septal funnels; representing a distinctbut otherwise unknown the Trenton limestone, Cannon Falls, Minn. This specimen may be advantageously compared with the figures of Orthoeerassimpsoni Billings, given by Whiteaves. (Orthoceratida3 of the Trenton of the Winnipeg basin; Trans. Roy. Soc. Canada, vol. ix, sect, iv, p. 80,pi. vii, figs. 2, 2a, 3; pi. viii, fig. 1, 1891). Fig. 2 CAMEROCERAS PROTEIFORME Hall 777 (See also plates Lviii, xu xii. xlii.)A portion of a large individual, showing the extent of the solid apical end of thesipho, and the abrupt increase in the depth of the air-chambers above the distalextremity of the body. Where the apical sheath is broken, at the lowerextremity of the specimen the cast of the Internal cavity and the thickness ofthe sipho are exposed. Cannon Falls, Minn.
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Keywords: ., bookcentury1800, bookdecade1890, bookidgeologyofmin, bookyear1897
