118 Fitementary Manual of Zoology. 
Pectinated.— With processes resembling the teeth of a comb. 
Peduncle.—A stalk sach as that by which the abdomen is connected 
with the thorax in many Hymenoptera. 
Pelvic.— Relating to the Pelvis. 
Pentamerous.—Belonging to the group Pentamera, with five-jointed 
tarsi. 
Plantigrade.— Walking upon the sole of the foot. 
Plumose.—Furnished with feathery hairs. 
Premolars.—Certain teeth in the Mammalia situated between the 
molars and the canines, 
Prolegs.—Fleshy protuberances which serve as additional legs in the 
larvee of some insects. 
Prothorax.—The anterior segment of the thorax in insects. 
Protoplasm.—A_ jelly-like substance which is an essential compenent 
of every cell. 
Pupa.—The resting stage which intervenes in the life history of 
many insects between the larval and imago stages. 
Pupal,—Relating to the pupa. 
Quadrate bone.—A bone situated in the side of the bead in Vertebrata. — 
Radially symmetrical,—With body arranged symmetrically around a 
central axis, the ventral surface not being differentiated from the 
dorsal. 
RKuminant.—That chews the cud. 
Scutellum.—A triangular plate situated in the middle of the back at 
the base of the front wings in Coleoptera and many Rhynchota, 
Segments.—The joints of which the body in Arthopoda is made up. 
Segmentation, —Di vision into sezments, 
Segmented.—Composed of segments. 
Sessile.—Attached direct without the intervention of a stalk. 
Stigmata.—The external openings of the breathing tubes in insects. 
Stridulation—Sound made by many Arthropoda. It is usually pro- 
duced by the rubbing of one rough surface against auother. 
Tarsus.—A joint, or series of joints, in the leg. 
Zetramerous.— Belonging to the group Tetramera, with four-jointed 
tarsi. 
Thoracie.— Belonging to the thorax. 
Thoraz.—One of the divisions of the body in Arthropoda and Verte- 
brata. 
Tibia.—TIn insects, one of the joints of the leg: in Vertebrata, one of 
the leg bones, 
Tissues.—The living materials of which the body is made up. 
Trachea.—The breathing tubes in insects. 
Trimerous.—Belonging to the group Trimera with three-jointed tarsi. 
