The softened slices are now repeatedly passed between grooved rollers, known FIG.
The face (clypeus) is (Grooved Whirlibroad, extending on either side gig).
Mandibles and first maxillae modified as piercers; second maxillae fused to form a jointed, grooved rostrum.
Mandibles absent in imago, very exceptionally present in pupa; first maxillae nearly always without laciniae and often without palps, or only with vestigial palps, their galeae elongated and grooved inwardly so as to form a sucking trunk.
The throttle-valve is opened or closed by turning a grooved vertical pulley by means of an endless cord, called the telegraph, passing round another pulley fixed upon the " headache-post," and is thus under the control of the driller working in the derrick.