. The Cambridge natural history. Zoology. ii6 CRUSTACEA SVNCARIDA characters are the entire absence of a carapace, and the freedom of the eight thoracic segments, with eight free thoracic ganglia in the nerve-cord; the peculiar double series of plate-like gills; the structure of the alimentary canal; and the fact that the eggs, instead of being carried in a brood-pouch, or affixed to the abdominal limbs, are deposited under stones and among Fig. 77.—Anaspides tasmaniae in natural position for walking, x 1. The last two [lereiopods point backwards and are overlapped by the first
. The Cambridge natural history. Zoology. ii6 CRUSTACEA SVNCARIDA characters are the entire absence of a carapace, and the freedom of the eight thoracic segments, with eight free thoracic ganglia in the nerve-cord; the peculiar double series of plate-like gills; the structure of the alimentary canal; and the fact that the eggs, instead of being carried in a brood-pouch, or affixed to the abdominal limbs, are deposited under stones and among Fig. 77.—Anaspides tasmaniae in natural position for walking, x 1. The last two [lereiopods point backwards and are overlapped by the first two pleopods. The Peracaridan features, uniting it especially with the Mysidacea, are the structure of the elongated heart, the filiform spermatozoa, and the fact that no complicated metamorphosis is passed through, the young hatching out in a condition similar to, though possibly not identical with, the adult form. The Eucaridan, especially Decapodan, features are the presence of an auditory sac on the basal joint of the antennules, 1 This cliaracteristic is found in the Crustacea elsewhere only in the Argulidae and certain 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 Harmer, S. F. (Sidney Frederic), Sir, 1862- ed; Shipley, A. E. (Arthur Everett), Sir, 1861-1927. ed. [London, Macmillan and Co. , Limited; New York, The Macmillan Company
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
