. Zoology : for students and general readers . Zoology. TETRADECAPODS. 305 form, the cliaage being induced by the greater or less saltness of the water. Artemia produces young by budding (partlie- nogenesis) as well as from eggs. c ad A species observed near Odessa V produced females alone in warm weather; and only in water of 'l~2'.Z. medium strength were males produced. The eggs of Arte- inia fertilis have been sent iu moist mud from Utah to Mu- nich, Germany, and specimens raised from the eggs by Siebold, proving the great vitality of the eggs of these Phyllopods, a fact paralleled by the s
. Zoology : for students and general readers . Zoology. TETRADECAPODS. 305 form, the cliaage being induced by the greater or less saltness of the water. Artemia produces young by budding (partlie- nogenesis) as well as from eggs. c ad A species observed near Odessa V produced females alone in warm weather; and only in water of 'l~2'.Z. medium strength were males produced. The eggs of Arte- inia fertilis have been sent iu moist mud from Utah to Mu- nich, Germany, and specimens raised from the eggs by Siebold, proving the great vitality of the eggs of these Phyllopods, a fact paralleled by the similar vitality of the eggs of the king-crab. Fig. 249 b represents the Nau- plius of the European brine- shrimp. Order 4. — Tetradecapoda.— To this order belong the sow- bugs {lao-podd) and the beach- fleas (Avijjhijwda). In these Crustacea there is no cephalo- thorax, but the head is small, bearing two pairs of antennse, and a pair of jaws, and three pairs of maxillffi. The thorax is continuous with the abdo- men. Eespiration is performed by lamellate or leaf-like gills on the middle feet in the Amphipods, or on the hinder abdominal feet in S^o^S^^S^^^^^'^^^^S^. the Isopods. The lowest Isopods are parasitic, they graduate into the Amphipods, and the higher Amphipods are connected with the shrimps (De- caxjoda) through a group (probably a suborder) of synthetic forms {PalcBOcaris, Acanthotelson and Gampsonyx, Pig. 254) such as are found in the coal formation of Illinois. Fi^. 252.—Brine-shrimp, Arlemia gracilis, enlarged, a, first anteuna ; 6, second antenna or clasper ; c, stalked eye ; d, e, jaws ; /, a foot; g, egg-sae. —After Verrill. Fig. iWi.—Artemia fertilis from Great Salt Lake, egg-sac ; c, male 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 Packard, A. S. (Alpheus Spring), 18
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1879
