. Zoology for high schools and colleges. Zoology. TETRADE0AP0D8. 285 form, the change being induced by the greater or less saltness of the water. Artemia produces young by budding (parthe- nogenesis) as well as from eggs. ' c a b A species observed near Odessa \,^ produced females alone in warm weather; and only in water of ^TZ; medium strength were males produced. The eggs of Arte- mia fertilis have been sent in 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 v
. Zoology for high schools and colleges. Zoology. TETRADE0AP0D8. 285 form, the change being induced by the greater or less saltness of the water. Artemia produces young by budding (parthe- nogenesis) as well as from eggs. ' c a b A species observed near Odessa \,^ produced females alone in warm weather; and only in water of ^TZ; medium strength were males produced. The eggs of Arte- mia fertilis have been sent in 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. 344 b represents the Nau- plius of the European brine- shrimp. Order 4. — Edriophthalma.— To this order belong the sow- bugs (Isopoda) and the beach- fleas (Amphipoda). In these ,Si.,Tnirr|S^-.!S?nt4S Crustacea there is no Cephalo- second antenna or clasper; «, stalked ,, 1 , 1 n 1 • ,, eye; (i, e, jaws;/, a foot; gr, egg-eac. thorax, but the head is small, —After verrui. bearing two pairs of antennse, and a pair of jaws, and three pairs of maxillEe. 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 the Isopods. The lowest Isopods are parasitic, they *' graduate into the Amphipods, and the higher Amphipods are connected with the shrimps (Be- capoda) through a group (probably a suborder) of synthetic forms (Palceocaris, Acanthotelson and Oampsonyx, Fig. 249) such as are found in the coal formation of Illinois. Pig. ZiS.—Artemia fertilis from egg-sac; c, male claspers. Great Salt 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), 1839-1905. New York, H. Holt and Company
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