Elements of zoölogy a Elements of zoölogy : a textbook elementsofzolo00tenn Year: c1875 402 MOLLUSCA: GASTEKOPODA. Univalves. Some, however, have no shell in the adult < state, though all have a shell when first hatched. Many kinds of gasteropods have a lid or door, called the opercuLum, with which they close the opening to the FIG. 643. Apex buturc ' Spire. W, whorls. Lines of Growth .„ Umbilicus Columella. Outer lip. . Aperture. • Canal. Names of the parts of a Gasteropod Shell. FIG. 544. =;?;-?;-;-|-;^-;- s - - J- .1 -rrrrr «M^_ JX sn - I — J jj — y Jj£ l^/ Ik/ «j j u 'J V a

---

Elements of zoölogy a Elements of zoölogy : a textbook elementsofzolo00tenn Year: c1875 402 MOLLUSCA: GASTEKOPODA. Univalves. Some, however, have no shell in the adult < state, though all have a shell when first hatched. Many kinds of gasteropods have a lid or door, called the opercuLum, with which they close the opening to the FIG. 643. Apex buturc ' Spire. W, whorls. Lines of Growth .„ Umbilicus Columella. Outer lip. . Aperture. • Canal. Names of the parts of a Gasteropod Shell. FIG. 544. =;?;-?;-;-|-;^-;- s - - J- .1 -rrrrr «M^_ JX sn - I — J jj — y Jj£ l^/ Ik/ «j j u 'J V a v!« W Jlvl vl^lV/ wi^iwiu:^ wlwl- July a£fiSbi^iaS=!- - 5 i - g 3 J2 5 « J « ci; iji} CN 2w*!5S -M** ''i- ^y ,, , lei Lingual teeth of Achatina, with central and lateral teeth enlarged. FIG. 545.

---

Size: 1502px × 1332px
Photo credit: © Bookworm / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage