PHYLUM ARTHROPOD A 223 



d. Subclass Ostracoda. — Carapace over whole body; two pairs 

 trunk appendages. Cypris, Candona. 



e. Subclass Cirripedia. — Marine; attached; usually enclosed by cal- 

 careous plates. Lepas, Balanus. 



f. Subclass Malacostraca. — Twenty or twenty-one somites; all 

 except last bear paired appendages. 



1. Order Phyllocarida. — Marine; thoracic appendages leaf like. 

 NebaJia. 



2. Order Schizopoda. — Eyes stalked; gills thoracic; trunk appen- 

 dages biramous. Mysis. ' 



3. Order Stomatopoda. — Eyes stalked; gills abdominal. Squilla, 

 Gonodactylus, Chloridella. 



4. Order Decapoda. — Carapace covers cephalothorax; five pairs 

 uniramous legs on thorax. Cambarus, Astactis, Homarus, Crago, 

 Peneus, Palaemon, Palaemonetes, Can cer, Callinedes, Carcinus, 

 Gelasimus, Libinia, Macrocheira, Upogebia, Pagurus, Emerita, 

 Hemigrapsxis. 



5. Order Amphipoda. — Laterally compressed; gills thoracic; two 

 types of abdominal appendages. Gammarus, Hyallela, Orchestia, 

 Caprclla, Amphithoe. 



6. Order Isopoda. — Dorsoventrally depressed; gills abdominal; 

 abdominal appendages (except uropods) similar. Asellus, Man- 

 casellus, Idothea, Porcellio, Oniscus. 



References 



(See general references cited at close of Chapter I) 



BiRGE, E A. 1895. Plankton Studies on Lake Mendota, L Vertical 

 Distribution of the Pelagic Crustacea during July 1894. Trans. 

 Wis. Acad. Sci., Arts, and Letters, 10: 421-484. 



BiRGE, E. A. and Juday, C. 1912. A Limnological Study of the Finger 

 Lakes of New York. U. S. Bur. Fish. Bull, 32: 527-609. 



Brooks, W. K. and Herrick, F. H. 1892. The Embryology and Meta- 

 morphosis of the Macroura. Proc. U. S. Nat. Acad., 5: 325-576. 



Churchill, E. P., Jr. 1919. Life History of the Blue Crab. U. S. Bur. 

 Fish. Bull, 36: 93-128. 



Darwin, C. 1851-1853. "A Monograph of the Sub-class Cirripedia." 

 London, Ray Societj'. 



Herrick, F. H. 1911. Natural History of the American Lobster. U. S. 

 Bur. Fish. Bull, 29: 149-408. 



Herrick, C. L. and Turner, C. H. 1895. Synopsis of the Entomostraca 

 of Minnesota. Geol and Nat. Hist. Surv. Minnesota, Zool Series, 2. 



Huxley, T. H. 1901. An Introduction to the Study of Zoology, Illus- 

 trated bj' the Crayfish. New York. 



Kunkel, B. W. 1918. The Arthrostraca of Connecticut. ConJi. Geol. 

 and Nat. Hist. Survey Bull 26. 



Marsh, C. D. 1907. Revision of the North American species of Diapto- 

 mus. Trans. Wis. Acad. Sci., Arts, and Letters, 15: 381-488. 



1910. A Revision of the North American Species of Cyclops. 

 Trans. Wis. Acad. Sci., Arts, and Letters, 16: 1067-1134. 



