STOMATOPODA. DECAPOD A. 511 



or absent (Alima) may be compared with the zoaea stage 

 of Euphausiidae and the Decapods. It differs however from 

 the zoaea stage of these forms in that the abdominal legs are 

 already developed. 



Owing to the pelagic habit and the prolonged period of meta- 

 morphosis of the larvae, during which they are borne about by 

 the perpetually circulating ocean currents, the species are 

 widely distributed over the shores of temperate and tropical 

 regions. The adults vary considerably in size from 38 mm. 

 (Chloridella microphthalma) to 34 cm. (Coronis maculata). Some 

 are of a uniform green colour, others are boldly marked with 

 transverse stripes of yellow and brown. 



Fossil Stomatopods have" been found in the Jurassic and later 

 formations. 



Fam. Squillina. Squilla Fab. S. mantis Rondelet and S. desmarestii 

 Risso have been taken on our shores. Lysiosquilla Dana ; Pseudosquilla 

 Dana ; Gonodactylus and Coronis Lat. ; Odontodactylus Bigelow ; Coronida 

 and Protosquilla Brooks, rostral spine of the larva retained in adult ; 

 Leptosquilla and Choridella Miers ; Pterygosquilla Hilgdf . 



Order 8. DECAPODA.* 



Malacostraca in which all the thoracic segments, or all but the 

 last one or two, are united with the head by the dorsal shield. The 



* Herbst. Versuch einer Naturgeschichte der Krabben und Krebse, 3 Bde., 

 Berlin, 17821804. Leach, Malacostraca podophthalma Britanniae, Lon- 

 don, 1817 to 1821. Th. Bell, A history of the British stalk-eyed Crustacea, 

 London, 1853. H. Rathke, Untersuchungen tiber die Bildung und Entwick- 

 elung des Flusskrebses, Leipzig, 1829. Speiice Bate, On the development 

 of Decapod Crustacea, Phil. Trans., London, 1859. Report on the Crustacea 

 Macrura, Challenger Report, 24 (1888). C. Glaus, Zur Kenntniss der 

 Malacostrakenlarven, Wurzb. naturwiss. Zeitschr., ii., 1861. Fr. Miiller, 

 Die Verwandlung der Garneelen, Archiv fur Naturgesch., xix, 1863. Fr. 

 Miiller, Fiir Darwin, Leipzig, 1864. V. Hensen, Studien iib das Gehororgan 

 der Dekapoden, Leipzig, 1863. C. Heller, Die Crustaceen des Siidlichen 

 Europa, Wien, 1863. P. Mayer, Zur Entwick. der Dekapoden, Jen. Zeits. 

 Bd. xi (1877). C. Grobben, Beitr. z. Kenntniss d. mannlich. Gesch 

 lechtsorgane der Dekapoden, etc., Arb. Zool. Inst. Wien, i (1878). J. E. V 

 Boas, Studier over Dekapodernes Slaegtskabsforhold, Vidensk. Selsk. 

 Skr., Kjobenhaven, 1880. T. H. Huxley, The Crayfish, London, 1880. 

 W. K. Brooks, Lucifer, Phil. Trans. 1882. H. Reichenbach, Studien zur 

 Entwick. des Flusskrebses, Abh. Senckenberg. Nat. Ges. Frankfort, 1886. 

 H. C. Bumpus, The Embryology of the American Lobster, Journ. Morph. 

 v, 1891. E. Bouvier, Rech. Anat. s. 1. syst. arterielle d. Crustaces Deca- 

 podes, Ann. Sc. Nat. 1891. W. K. Brooks and F. H. Herrick, The Em- 

 bryology and Metamorphosis of the Macroura, Mem. Nation. Acad. Science, 

 Washington, 1891. P. Marchal Rech. Anat. et physiol. sur 1'appareli 



