. The Cambridge natural history. Zoology. 304 ARACHNIDAâSCORPIONIDEA are coxa, trochanter, femur, patella, tibia, protarsus, and tarsus, and it is certainly convenient that each joint should have a separate name, but it must be borne in mind tliat the tibia of different authors is not always the same joint. Special atten- tion must be directed to the three terminal joints, which furnish highly important characteristics. The tibia (in Pocock's sense) is sometimes pro- vided with a " tibial spur " at its lower distal ex- tremity. From the soft arthrodial membrane be- tween the protarsu
. The Cambridge natural history. Zoology. 304 ARACHNIDAâSCORPIONIDEA are coxa, trochanter, femur, patella, tibia, protarsus, and tarsus, and it is certainly convenient that each joint should have a separate name, but it must be borne in mind tliat the tibia of different authors is not always the same joint. Special atten- tion must be directed to the three terminal joints, which furnish highly important characteristics. The tibia (in Pocock's sense) is sometimes pro- vided with a " tibial spur " at its lower distal ex- tremity. From the soft arthrodial membrane be- tween the protarsus and tarsus may proceed one Fig. Diagram of a Scorpion's leg; 1, or more dark-tipped claw- coxa; 2, troclianter ; 3, femur; 4, patella; , '-'^ 5, tibia ; 6, protarsus ; 7, tarsus ; , pedal like SpurS, the " pedal spur; , tibial spur. B, Fourth tarsus of onnrq" Thp tpvmiml Palamnaeus sioammerdami ; I, lateral lobe, "f'-"*- ^'â ^'^ beiuiiuai (After Pocock.) joint (tarsus of Pocock) is variously furnished with hairs and teeth, and always ends in a pair of well- developed movable claws beneath which a much reduced and sometimes almost obsolete third claw is distinguishable. The tarsus generally projects in a " claw-lobe" over the base of the superior claws, and sometimes lateral lobes are present. The first and second coxae have triangular maxillary lobes directed towards the mouth. The third aud fourth coxae are fused together on each side, and those on one side are separated from those on the other by the sternum. In other respects the four pairs of legs are usually Internal Anatomy. The alimentary canal is a fairly uniform tube, nowhere greatly dilated. The very small mouth leads into a small suctorial chamber, and this is connected by a narrow oesophagus, which pierces the cerebral nerve-mass, with a slightly dilated portion which receives the ducts of the first pair of gastric. Please note that these images are extracted
Size: 1669px × 1497px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
