. Elementary text-book of zoology. Zoology. THORACOSTRACA. 465 The ducts of the very numerous, multilobed hepatic c-eca open into the anterior part of the elongated intestine. A simple or looped glandular tube (the green gland} opens on the basal joint of the posterior antenna. A shell gland is not developed. The nervous system is distinguished by the size of the brain, which is placed far forwards and gives off nerves to the eyes and antennae. The ventral cord, which is connected with the supra- cesophageal ganglion (brain) by very long commissures, presents very different degrees of concentr
. Elementary text-book of zoology. Zoology. THORACOSTRACA. 465 The ducts of the very numerous, multilobed hepatic c-eca open into the anterior part of the elongated intestine. A simple or looped glandular tube (the green gland} opens on the basal joint of the posterior antenna. A shell gland is not developed. The nervous system is distinguished by the size of the brain, which is placed far forwards and gives off nerves to the eyes and antennae. The ventral cord, which is connected with the supra- cesophageal ganglion (brain) by very long commissures, presents very different degrees of concentration. In the brachyurous Decapods this concentration reaches its highest point, all the ganglia being together to form one great thoracic ganglionic mass. The system of visceral nerves is also very highly developed. Sense organs.—The eyes are large and facetted. Except in the. 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 Claus, Carl, 1835-1899; Sedgwick, Adam, 1854-1913; Sinclair, F. G. (Frederick Granville), b. 1858. New York : Macmillan
Size: 1516px × 1648px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884
