. First[-fourth] annual report of the Geological survey of Texas, 1889[-1892] Edwin T. Dumble, state geologist. Fig. Ffe. 37. CARBONIFEROUS CEPHALOPODS. 337 slightly convex zones on either side of the umbilical shoulders. The umbil-ical shoulders or crests may be slightly nodular in some specimens. There isan impressed zone on the dorsum, the involution embracing the surface of theabdomen but not covering the nodes. The transverse diameter through theumbilical shoulders is greater than that measured through the dorsal part be-tween any two nodes in a full grown shell which has not been di
. First[-fourth] annual report of the Geological survey of Texas, 1889[-1892] Edwin T. Dumble, state geologist. Fig. Ffe. 37. CARBONIFEROUS CEPHALOPODS. 337 slightly convex zones on either side of the umbilical shoulders. The umbil-ical shoulders or crests may be slightly nodular in some specimens. There isan impressed zone on the dorsum, the involution embracing the surface of theabdomen but not covering the nodes. The transverse diameter through theumbilical shoulders is greater than that measured through the dorsal part be-tween any two nodes in a full grown shell which has not been distorted bycompression. Fig. 35. The sutures are nearly straight or slightly concave on the inside of theumbilical shoulders, with a shallow lobe on the dorsal zone, slight lateral lobeson the sides, and small saddles at the junction (genicular crest) of sides andabdomen. On the abdomen there are only very shallow broad lobes. Siphuncle above the centre. Living chamber somewhat over one-half of avolution in length and still imperfect. Metacoceras Walcottt, n. s. Loc. San Saba County, Texas. Coll. National Museum. Col
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