. A conchological manual. Shells. INTRODUCTION. 25 Fig. 43, Heliciua, semilunar; 44, Pirena, piriform; 45, Cyprsea, linear; 46, Trochus, trigonal; 47, Cyclostoma, rounded; 48, Chilina, poste- riorly contracted; 49, Stomatia, transversely oval; 50, Murex, longitu- dinally oval. The entire edge of the aperture described generally, is named the Peritreme, but this term can only be conveniently applied in cases where, in some at least of its characters, it is the same all round, so that one descriptive term is applicable to the whole. As, however, this is of rare occurrence, it is foun
. A conchological manual. Shells. INTRODUCTION. 25 Fig. 43, Heliciua, semilunar; 44, Pirena, piriform; 45, Cyprsea, linear; 46, Trochus, trigonal; 47, Cyclostoma, rounded; 48, Chilina, poste- riorly contracted; 49, Stomatia, transversely oval; 50, Murex, longitu- dinally oval. The entire edge of the aperture described generally, is named the Peritreme, but this term can only be conveniently applied in cases where, in some at least of its characters, it is the same all round, so that one descriptive term is applicable to the whole. As, however, this is of rare occurrence, it is found convenient in descriptions to separate the rim from the outer lip. In a great number of instances, this is done natu- rally, by a canal, or notch at the anterior or lower extremity, and by the posterior union of that part which overlays the body whorl with the other portion. At these two points the outer and inner lips separate from each other: we therefore describe the Canals of the Aperture. When there is neither notch nor canal, anteriorly or poste- riorly, interrupting the edge of the aperture, it is described as entire. When there is a notch or sinus at the anterior. 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 Sowerby, G. B. (George Brettingham), 1812-1884; Henderson, J. B. (John Brooks), 1870-1923, former owner. DSI; Dall, William Healey, 1845-1927, former owner. DSI. London : Henry G. Bohn
Size: 2310px × 1082px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthordallwilliamhealey1845, bookcentury1800, bookdecade1840
