Alaska volume 13
Alaska volume 13
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In our eReader you can find the full English version of the book. Read Alaska volume 13 Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Alaska volume 13
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94. Val- Frances Lake, head of the Liard River ! Fort Chimo, vata lewisi Cur- Labrador ! Sturgeon Lake, Athabaska ! Upper Colum- rier, |. Bia Lake ! (Tyrrell) .
The name seems to have been originally proposed for a brown muta- tion of V. Sincera Haldeman {non Say), but may well be extended to cover the whole species, which has no other available name. The shell when normally developed and adult has four whorls with a height of 3. 6 and a diameter of 5. 75 mm. It has a much wider umbilicus than ...var. Simplex of tricarinata and is a larger shell, yet usually has a smaller protoconch. The sculpture is axial, fine and close, like the winding of thread on a spool. In the typical form this sculpture is coarser and more prominent than in the less common helicoidea. In both it is largely resident in the periostracum, the decorticated shell being nearly smooth.
Valvata lewisi var. Helicoidea nov. PI. Ii, figs, i, 2.
This form resembles lewisi but is more depressed, almost flat above, and more or less flattened toward the suture ; the whorls are more slen- der and near the aperture usually rather suddenly expanded ; the sur- face is polished, the sculpture frequently obsolete, the umbilicus wide, and its bounding coil peripherally diverted during the grovrth of the last half whorl ; height 2.
What to read after Alaska volume 13?
You can find similar books in the "Read Also" column, or choose other free books by Harriman Alaska Expedition 1899 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
94. Val- Frances Lake, head of the Liard River ! Fort Chimo, vata lewisi Cur- Labrador ! Sturgeon Lake, Athabaska ! Upper Colum- rier, |. Bia Lake ! (Tyrrell) .
The name seems to have been originally proposed for a brown muta- tion of V. Sincera Haldeman {non Say), but may well be extended to cover the whole species, which has no other available name. The shell when normally developed and adult has four whorls with a height of 3. 6 and a diameter of 5. 75 mm. It has a much wider umbilicus than ...var. Simplex of tricarinata and is a larger shell, yet usually has a smaller protoconch. The sculpture is axial, fine and close, like the winding of thread on a spool. In the typical form this sculpture is coarser and more prominent than in the less common helicoidea. In both it is largely resident in the periostracum, the decorticated shell being nearly smooth.
Valvata lewisi var. Helicoidea nov. PI. Ii, figs, i, 2.
This form resembles lewisi but is more depressed, almost flat above, and more or less flattened toward the suture ; the whorls are more slen- der and near the aperture usually rather suddenly expanded ; the sur- face is polished, the sculpture frequently obsolete, the umbilicus wide, and its bounding coil peripherally diverted during the grovrth of the last half whorl ; height 2.
What to read after Alaska volume 13?
You can find similar books in the "Read Also" column, or choose other free books by Harriman Alaska Expedition 1899 to read onlineMoreLess
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