Text-book of comparative anatomy . Fin. 284.—Limulus polyphemus, young specimen from the ventral side (after Packard). The leaf-like feet serve for swimming as well as for sternal encloskeleton is present. XIPHVXURA 419 Nervous central nervous system consists of aganglionic mass lying in the cephalothorax and surrounding the oeso- \ ^ It <L4 m. inn mu. PIG. -_^j.—Median longitudinal section through a young Limulus polyphemus (afterPackard), ctlt, Cephalothorax; tib, abdomen; ss, caudal spine; rm, anterior stomach; m,stomach; Ti, heart; ss, sternal cartilaginous
Text-book of comparative anatomy . Fin. 284.—Limulus polyphemus, young specimen from the ventral side (after Packard). The leaf-like feet serve for swimming as well as for sternal encloskeleton is present. XIPHVXURA 419 Nervous central nervous system consists of aganglionic mass lying in the cephalothorax and surrounding the oeso- \ ^ It <L4 m. inn mu. PIG. -_^j.—Median longitudinal section through a young Limulus polyphemus (afterPackard), ctlt, Cephalothorax; tib, abdomen; ss, caudal spine; rm, anterior stomach; m,stomach; Ti, heart; ss, sternal cartilaginous endo-skeleton; d, intestine; ;/, brain; ug, infraal ganglionic mass; bin, ventral chord; o, operculuin; rti-ag, gill carrying abdominals; mu, mouth; an, anus. phagus ; it is continued into the abdomen as a ganglionic ventral circular ganglionic mass of the cephalothorax is found to consistof the brain, which lies in front of the oesophagus, and gives off nervesto the lateral eyes and the ocelli, and of 7 postoral pairs of ganglia Aviththeir transverse commissures, these ganglia lying near each latter yield the nerAres for the cephalothoracic limbs. The ventralchord of the abdomen consists of 6 ganglia, the last of Avhich is thelargest. The nerves to the leaf-like feet are given oft* by theselatter. The compound eye of Lit twins (Fig. 286) deserves sp
Size: 2325px × 1074px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomycomparative
