Kev. Canon A. M. Norman on British Mysidsfi. 251 

 Genus 10. Macromysis, A. White* (1847). 



= Themisto, H. Qood>ih-,= Mt/sidia, T}a,na, = Si/mni/sis aud 

 Keslerella, Czeniiavskj. 



Antennal scale elongated, linear, nearly parallel-sided, four 

 to nine times as long as broad ; outer margin naked, termi- 

 nated by a spine ; apex of scale not surmounting or only 

 slightly projected beyond the extremity of this spine. Legs 

 with tarsus of four to seven articulations, terminating in a 

 nail. Telson cleft at the extremity, cleft serrated. Fourth 

 pleopod of male having the inner branch small, two-jointed, 

 the first giving off an outward-directed seta-tipped lobe ; 

 outer branch very long and stiliform, consisting of seven 

 gradually attenuating articulations, the terminal one distally 

 verticillately ciliated and bulb-formed at the extremity. 



1. Macromysis Jlexuosa (Miiller). 



1788. Cancer Jlexuosns, Miiller, Zool. Dan. vol. ii. p. 34, pi. Ixvi. 



figs. 1-9. 

 1808. Cancer asfacus multipes, Montagu, Linn. Trans, vol. ix. p. 8(), 



pt. ii. tig. 26. 

 1815 (?). Praunusjiezuosus, Leach, Edin. Eiicycl. vii. p. 401. 

 1815. Mijsis spinulosa, Leach, Linn. Trans, vol. xi. p. 350. 

 1828. Mysis chamceleon, J. V. Thompson, Zoolog. Researches, i. p. 28, 



pi. ii. tigs. 1-10. 

 1828. Mysis Leachii, id. ibid. p. 27. 

 1844. Mysis spimdosHs, Zaddach, Synopseos Crust. Prussic. prodromus, 



p.2, cT'?. 

 1855. My sis Jlexuosa, Kroyer, Gaimard, Voyage en Scandinavie &c., 



Crust, pi. ix. tigs. 1-3. 

 1853. Mysis chanueleon, Bell, Brit. Stalk-eyed Crust, p. 336, 5 • 

 1853 1- Themisto brevispinosa (H. Goodsir), Bell, Brit. Stalk-eyed 



Crust, p. 384, S • 

 I860. Mysisjlexiiosus, Norman, Ann. & Mag. Nat. Hist. ser. 3, vol. vi. 



pi. viii. figs. 1-3. 



1860. Mysis chamceleo, P. J. Van Beneden, Recher. sur la fauue litt. de 

 Belgique, Crustaces, p. 14, pis. ii.-v. 



1861. Mysis Jlexuosa, Kroyer, Nat. Tidsski". 3die Hsekke, vol. i. p. 2. 

 1879. Mysis Jlexuosa, G. O. Sars, Carcinol. Bidrag til Norges Fauna, 



I. Monogr. Mysider, p. 45, pis. xxiv., xxv. 

 1882. Synmy sis Jlexuosa, chanKxleon, Benedeni, and Mecznikoi, Czerni- 

 avsky, /. c. fasc. i. pp. 31, '52. 



* A. White, ' List of Crust, in Brit. Mus.' (1847), p. 81 ; ' Popular 

 History of British Crustacea' (1857), p. 146. 



t It seems probable that Goodsir's 'Themisto brevispinosa was the male 

 of this species, but what his T. lonyispinosa was I cannot guess. One 

 tliiug is certain, that his genus Thcmido, = Macrottiysis, White, was 

 founded on males of the genus to wliich I apply the name. 



17* 



