...Once the old skin has passed over the thick mid-body, the snake often crawls forward using rectilinear locomotion until the skin is completely shed... 
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...Four distinct types of locomotion have been described in snakes: horizontal undulatory, rectilinear, sidewinding, and concertina (Klauber, 1956: 331-350)...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...Rectigrade: larvae which, having sixteen feet, walkwith a rectilinear body...
John. B. Smith 「Explanation of Terms Used in Entomology」
...Sharpe:Norman, 1066-1145; Transitional, 1145-1190; Lancet, 1190-1245;Geometrical, 1245-1315; Curvilinear, 1315-1360; Rectilinear,1360-1550...
Anonymous 「Ely Cathedral」
...A stone similarly cast intoempty space would pursue a course absolutely rectilinear...
Robert Stawell Ball 「The Story of the Heavens」
...That influence, whatever it may be, constantly deflects the earth fromthe rectilinear path which it tends to pursue, and constrains it totrace out an ellipse instead of a straight line...
Robert Stawell Ball 「The Story of the Heavens」
...We have seen how the appendagesdeclined to invisibility once every fifteen years, and then graduallyreappeared in the form, at first, of rectilinear arms projectingoutwards from the planet...
Robert Stawell Ball 「The Story of the Heavens」
...Admitting, then, the rectilinear path of the body, the next questionwhich arises relates to the velocity with which that movement isperformed...
Robert Stawell Ball 「The Story of the Heavens」
...A powerful disturbing influence might greatly alter the velocity of thestar; it might deflect the star from its rectilinear course; it mighteven force the star to move around a closed orbit...
Robert Stawell Ball 「The Story of the Heavens」
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