...The measurement should be taken straight frombase to tip, and not following the curves of the spiral... 
Robert A. Sterndale 「Natural History of the Mammalia of India and Ceylon」
...The aperture is more round than ovate, and is less than one half the total length of the shell; the outer lip much reflected, and the transverse bands on the spiral whirls nearly obsolete...
William Swainson 「Zoological Illustrations, Volume I」
...Spire elongated, chesnut-brown; base of the spiral volutions with a whitish band, which is central on the basal whorl...
William Swainson 「Zoological Illustrations, Volume I」
...In the first of these, the end joints of the antennæ are rolled up in more or less of a spiral (fig...
Edward Saunders 「Wild Bees, Wasps and Ants」
...Every now and then the stalk ofsome specimen is suddenly twisted into a spiral, andcontracted, so as to bring the bell almost to the ground...
Henry J. Slack 「Marvels of Pond-life」
...Each onehad a spiral wreath of cilia, with a mouth situated likethose of the stentors, hereafter to be described, but noneof them became stationary, and in a few days they alldisappeared...
Henry J. Slack 「Marvels of Pond-life」
...Call, a clearly whistledwheé-you and a softer too-whee; song, a weird, spiral ofblended alto and soprano tones largely on one note...
Frank M. Chapman 「Color Key to North American Birds」
...When a Heron passes, a cast or couple of Falcons are thrown off,which dart into the air, flying in a spiral direction to get above theHeron...
Rev. C. A. Johns 「British Birds in their Haunts」
...He seldom deigns to notice his noisyand furious antagonists, but deliberately wheelsabout in that aerial spiral, and mounts and mountstill his pursuers grow dizzy and return to earthagain...
John Burroughs 「Bird Stories from Burroughs」
...Antlia: the spiral tongue or haustellum ofLepidoptera...
John. B. Smith 「Explanation of Terms Used in Entomology」
...Spiritrompe: the spiral tongue in Lepidoptera...
John. B. Smith 「Explanation of Terms Used in Entomology」
...Taenidium -ia: the band or chitinized fibre forming apart of the spiral thread in the trachea of insects...
John. B. Smith 「Explanation of Terms Used in Entomology」
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