. Bulletin - United States National Museum. Science. Jaw of JI. Sayii. (Morse.). Jaw as usual in the genus; 15 ribs, figure.) The lingual membrane (Terr. Moll., V, Plate VIII, Pig. B) has 42-1-42 teeth, with about 15 i)crfect laterals; the change irom laterals to marginals is made without the splitting of the inner cutting i'''«- •'''15- point. The centrals and first laterals have, no distinct side cusps and cutting points. Genital system (see Leidy, /. c.) very re- markable for the enormous development of the penis sac; it is stout, cylindrical, as long as the whole genital system, receiving
. Bulletin - United States National Museum. Science. Jaw of JI. Sayii. (Morse.). Jaw as usual in the genus; 15 ribs, figure.) The lingual membrane (Terr. Moll., V, Plate VIII, Pig. B) has 42-1-42 teeth, with about 15 i)crfect laterals; the change irom laterals to marginals is made without the splitting of the inner cutting i'''«- •'''15- point. The centrals and first laterals have, no distinct side cusps and cutting points. Genital system (see Leidy, /. c.) very re- markable for the enormous development of the penis sac; it is stout, cylindrical, as long as the whole genital system, receiving both M. chiihoiveensis. rctractor musclc and vas deferens at its sum- mit; genital bladder large, elongate-ovate, on a very short duct. The large form from the North Carolina and Tennessee mountains, here figured, was called H, Ckilhoiceensis by Dr. Lewis. He says of it: n. Chiihoiveensis differs from typical ^cf^/ii in having a cubic capacity more than five times as great, smaller or more rudimentary teeth, a wider development of the reflected lip on the base, and iu several other, less important details. The greatest diameter of the most perfect shell before me is about ; (Lewis.) (See also Proc: Acad. Nat. Sei. Phila., 1875, 334.) The dentition and genitalia of this form* are figured in Bull. Mus. C. Z., y, No. 10, Plates I and II. The [)euis sac is greatly developed. * Similar to that of the type,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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