. Elementary text-book of zoology. BLATTA. 223 confinement upon bread. The body is piano-symmetric, and is encased in a hard exoskeleton. This consists of a chitinous cuticle secreted by the ectoderm, but it differs from that of the lobster in the absence of lutegu- mentaiy. calcareous matter. Hence the exo-skeleton is tough and somewhat flexible, but not nearly so hard and thick as that of the latter. We can stili Fig. 148.—The Common Cockroach (Blatta Orientalis). Natural A, Male with wings expanded ; B, Female with vestigial wings ; C, Wingless young. distinguish chitinous sclerites
. Elementary text-book of zoology. BLATTA. 223 confinement upon bread. The body is piano-symmetric, and is encased in a hard exoskeleton. This consists of a chitinous cuticle secreted by the ectoderm, but it differs from that of the lobster in the absence of lutegu- mentaiy. calcareous matter. Hence the exo-skeleton is tough and somewhat flexible, but not nearly so hard and thick as that of the latter. We can stili Fig. 148.—The Common Cockroach (Blatta Orientalis). Natural A, Male with wings expanded ; B, Female with vestigial wings ; C, Wingless young. distinguish chitinous sclerites united by softer arthrodial membranes. The body is divided into three parts—the head, the thorax and the abdomen. Of these the head is not segmented, the thorax is partially so, but the abdomen is as clearly segmented as in the lobster. The head bears one pair of long antennx at the anterior end, and close to them is a pair of compound eyes, not. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Masterman, Arthur Thomas. Edinburgh, E. & S. Livingstone
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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1900, bookyear1902
