32 



name Uroptychns, tail-folding, and that the accession of this fold 

 to the ordinary infolding uf the pleon suggested the name 

 JJiptychns, d<3uble-folding. 



Gkn. : Uroptychus, Henderson. 



1880. Diptychns (pre-occ.j. A- Milne-Edwards, Bull- AIus. Comp. 



Zool. Harvard, vol. 8, p. 61. 

 J 888- Uroptychns, Henderson. Challenger Anoniura, Reports, 



vol. 27, p. 173. 

 i888- Diptychns, Bonnier, Bull, Sci. France-Belgique, ser- 3, vol. 



1, P- 83. 

 1892. Uroptychns, Ortmann, Zool Jahrb., vol. 6, p. 248. 

 J 893. Uroptychns, Stebbing, History of Crustacea, p- 177. 



1894. Diptychns, A. Milne-Edwards and Bouvier, Crust, decap- 



Hirondelle, Monaco, fasc. 7, p. 87. 



1895. UroptychiLSy Faxon, Mem. Mus. Comp. Zool, Harvard, 



vol. 18, p. lOI. 

 .1899- Diptychns, A- i\Iilne-Ed wards and Bouvier, Crust, decap., 



Monaco, fasc. 13, p. 87. 

 1901. Uroptychns, Alcock, Catal. Indian Deep-Sea Crust., 



Macrura and Anomala, p. 281. 

 The strongly developed exopod or acicle of the second antennae 

 is a characteristic feature of the genus. 



L'K(jPTycuus iMTiDUS (A- Milne-Edwards). 



J 888. Diptychns nilidns. A. Milne-Edwards, Bull- Mus. Comp. 



Zool. Harvard, vol. 8, p. 62. 

 1888. Uroptychns uitidus, Henderson, Challenger Anomura, 



Reports, vol- 27, p. 174, pi. 21, tig. 6 • 

 1894. Uroptychns nitidns, Alcock and Anderson, Journ. Asiat. 



Soc. Bengal, vol. 63, pt. 2, p. 33 

 1894. DiptycJnts nitidns. var. concolor, A. Milne- Edwards and 



Bouvier, Ann- Sci. Nat., Zool. ser. 7, vol. 16, pp. 225, 



etc., figs. 16, 21. 

 1896- Crop'ychns nitidus. var. concolor, Caullery, Campagne 



Caudan, fasc. 2, p. 393- 



1899- Piptychus nitidns, var. concolor, A. ]\Ii!nc-Ed\\ards and 



Bouvier, Crust, decap. ^^fonaco, fasc- 13, ]). ^y. pi. t, 

 fig. 2. 



1900- Diptychns nitidns. var. concolor, .\. Milne Edwards and 



■Rouvier. Cnist. decap. Travailleur et Talisman, p. 360, 

 pi. 4. fig. 4. i>l. ^2. figs. T5-T9. 



