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* ''Spirale'': Le linee formano una spirale;
* ''Misto'': Composto con varie figure.
==Bibliografia==
* [[William Leo]], [http://www.scafo.org/The_Print/The_PRINT_VOL_21_ISSUE_05.pdf "Will DNA Replace Fingerprints in the 21st Century?"], ''The print'', Volume 21 Issue 5, September-October 2005.
* William Leo, ''Fingerprint Identification'', Law Tech, 2004. ISBN 1-889315-23-0
* William Leo, [http://www.fingerprintidentification.net/sitebuildercontent/sitebuilderfiles/History.ppt "Historical and Scientific Foundation of Friction Skin Identification"] (.PPT)
* David R. Ashbaugh, [http://www.onin.com/fp/ridgeology.pdf "Ridgeology. Modern evalutative friction ridge identification"], a cura di Forensic Identification Support Section e Royal Canadian Mounted Police, dall'FBI's LEO Intranet, 10 marzo 1999.
* [[Alfred Hale]], ''Morphogenesis of the Volar Skin in the Human Fetus'', 1952.
* [[Harold Cummins]] ''et al.'', ''Finger Prints, Palms and Soles - An Introduction to Dermatoglyphics'', 1943.
* [[Harold Cummins]], ''The Topographic History of the Volar Pads in the Human Embryo'', 1929.
* [[Harris Hawthorne Wilder]], Bert Wentworth ''Personal Identification'', 1918.
* [[Inez Whipple]], ''The Ventral Surface of the Mammalian Chiridium - With Special Reference to the Conditions Found in Man'', 1904.
== Voci correlate ==
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