 ... rounded axial riblets, obsolete on the last whorl; suture appressed, the whorl in front of it flattish, with no well-marked shoulder, but more or less distinct axial wrinkling just in front of the suture; on the last whorl there are 15-17 prominent,...  Smithsonian Miscellaneous Collections - Página 231908 - 6 páginasVista completa - Acerca de este libro
 | William Healey Dall - 1908 - 760 páginas
...exterior sculpture. ?-j. the external spiral cords, and not on the true plaits; early whorls with 8-10 rounded axial riblets, obsolete on the last whorl;...posterior sinus narrow, well marked, close to the suture. Lou. 1 24 ; of aperture, 87 ; max. diam. 33 mm. VOLUTODERMA PROTRACTA Dall, n. sp. (FIGURE 10) Shell... | |
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