TERTIARY DECAPOD CRUSTACEANS. 161 



NOTES ON THE GENERA REPRESENTED. 



The genus Callianassa 1 ranges from the Jurassic era to the present 

 day and contains very numerous species, fossil 2 and Recent, distributed 

 in both hemispheres. 



Petrochirus 3 occurs in the waters on both sides of tropical America, 

 and in the upper Tertiary of Panama. 



Ranina 4 is known from more than a dozen species distributed from 

 the Cretaceous to Recent, the fossil forms 5 ranging from central Europe 

 to Japan, and occurring isolated in Trinidad. Only one species is now 

 living and that is confined to the Indo-Pacific region. 



Lyreidus 6 has been found in the Tertiary of Piedmont, Italy. Of its 

 Recent species, one (L. bairdii) 7 inhabits deep water off the Atlantic 

 and Gulf coasts of North America, while three others (L. tridentatiu* 

 L. elongatus, 9 and L. channeri 10 ) represent the Indo-Pacific region, the 

 latter inhabiting the Indian Ocean at a depth of 200 to 400 fathoms. 



Calappa 11 has a range from Eocene to Recent (Zittel). 



Calappella 12 Rathbun is known from the Oligocene of Panama. 



Cycloes 13 up to now known only as Recent on both sides of the Ameri- 

 can continent, the Bermudas, and the Indo-Pacific. 



Persephona 1 * hitherto recorded from the post-Tertiary of Celebes 15 

 (as Myra) and widely distributed in the warmer waters of the globe. 



Scylla™ a genus of swimming crabs, is known at the present time 

 from one living species only, which is widely distributed throughout 

 the Indo-Pacific region. This species has also been found fossil on the 

 coasts of Asia between the Red Sea and Japan, and in the Philippines; 

 also in the island of Malta, at which place it is reported from the 

 Oligocene or older Miocene. A second species, S. micheKni, 17 occurs in 

 the Miocene of Anjou. 



Portunus Weber 18 ( = Neptunus de Haan 19 ), a comprehensive genus, 

 makes its appearance in the Eocene and is represented in the recent 

 fauna also by numerous species in all temperate and tropical seas. 



1 Leach, Edin. Encyc, vol. 7, p. 400, 1814. 



2 See B6hm, Monatsber. deutsch. geol. Gesell., vol. 63, pp. 42-46, 1911. 



3 Stimpson, Proc. Acad. Nat. Sci. Philadelphia, vol. 10, p. 233 [71], 1858. 



4 Lamarck, Syst. Anim. sans Vert., p. 156, 1801. 



6 See Woodward, Quart. Jour. Geol. Soc. London, vol. 22, p. 591, 1866. 



6 De Haan, Fauna Japon., Crust., p. 138, 1841. 



7 Smith, Proc. U. S. Nat. Mus., vol. 3, p. 420, 1881. 



8 De Haan, Fauna Japon., Crust., p. 140, plate 35, fig. 6, 1841. 



9 Miers, Proc. Zool. Soc. London, p. 46, 1879. 



10 Wood-Mason, Proc. Asiat. Soc. Bengal, Aug. 1885 (issued Nov. 2, 1885), p. 104. 



11 Weber, Nomenclator entomologicus, p. 92, 1795. 



12 Bull. U. S. Nat. Mus. No. 103, p. 157, 1918. 



13 De Haan, Fauna Japon., Crust., pp. 67 and 68, 1837. 



14 Leach, Zool. Misc., vol. 3, pp. 18 and 22, 1817. 



15 De Man, Samml. Geol. Reichs-Mus. Leiden, ser. 1, vol. 7, p. 276, 1904. 



16 De Haan, Fauna Japon., Crust., pp. 3 and 11, 1833. 



17 A. Milne-Edwards, Ann. Sci. Nat., ser. 4, vol. 14, p. 136, plate 3, figs. 3, 3a, 1861. 



18 Nomenclator entomologicus, p. 93, 1795. 



19 Fauna Japon., Crust., pp. 3 and 7, 1833. 



