Information om | Engelska ordet VOLUTIONS

Exempel på hur man kan använda VOLUTIONS i en mening

• Alveolinella is an exception as the proloculus in the microspheric form is perforate and the first volutions are peneroplid in character, suggesting it, Alveolinella, may have a different origin than the other alveolinids.
• Gyronaedyceras has a compressed gyroconic shell of about two volutions with an assymmnetrical, subtraingular whorl section having a broadly rounded to subangular venter and flat dorsum.
• These ribs have a decided protractive slant on the early whorls, while on the middle turns they are vertical, and on the later volutions they have a decidedly retractive slant.
• rather strong, well-rounded axial ribs, which are slightly retractively slanting on the early turns and decidedly so on the later volutions.
• It should evidently be considered especially with Trypanotoma and allies, but it is somewhat of an annectant form, as the American species at least have true ribbing on the nepionic whorls which becomes completely lost on the larger volutions of the shell.
• The sculpture is modified on the later volutions by the increasing prominence of the peripheral spiral and that directly behind it, the intercalation of secondaries, and the development of undulatory axials 8 to 10 to the whorl.

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