242 Proceedings of the Boyal Fhysiccd Society. 



Division II. CEgopsida, d'Orbigny, 1839. 



Family X. 0mm astr e ph i n i, Steenstrup, 1861. 



Subfamily Thysanoteuthid^, Keferstein, 1866. 



Thysanoteuthis, Troschel, 1857. 



1. T. rhombus, Troscb., Arcbiv f. Naturgescb., xxiii., 1, p. 70, 



pi. iv., fig. 12 ; pi. v., figs. 1-4, 1857. 

 1881. TMjsanoteitthis rhombus, Vigelius, Mittli. Zool. Stat. Neapel, ii., 

 p. 150. 

 Mediterranean Eegion. 



2. T. elegans, Troscbel. 



1851. SepioteutMs Simla (?), Ver., Ceph. medit, p. 75, pi. xxvii. 

 1857. Thysanoteuthis elegans, Trosch., Arcliiv f. Naturgesch., xxiii., 

 1, p 74, pi. iv., figs. 10, 11. 

 Mediterranean Region. 



Subfamily OmmastrephidtE, Gill, 1871. 



Ommastrephes, d'Orbigny, 1835. 



Sthenoteuthis, Verrill. 



1. 0. Bartramii (Lesr,), d'Orb. 



1821. Loligo Bartramii, Lesr., Journ. Acad. Nat. Sci. Pliilad., ii., p. 



90, pi. vii. 

 1835. Ommastreiohes Bartramii, d'Orb., Amer, merid., p. 55. 

 1835. ,, cylindricus, d'Orb., Cepb. acet., p. 54, pi. iii., 



jfigs. 3, 4. 

 1839. ,, ,, d'Orb., op. cit., p. 347, pb ii. ; 



Ommast., pi. ii., tigs. 11-20. 

 1880. Ommatostrcphes Bartramii, Stp., Ommat. Bleekspr., pp. 79, 81, 

 figs.i 

 Atlantic and Indian Oceans ; New England and Mediter- 

 ranean Regions. 



2. 0. gigas, d'Orb., Amer. me'rid., p. 50, pi. iv., 1835 ; Cepb. acet., 



p. 350, pi. XX., 1839. 

 Pacific Ocean. 



3. 0. pteropus, Stp. 



1822. Loligo todaropterus (J), d. Cli., Mem. stor, nat, pi. xcv. {fide 



Stp.). 



1823. ,, Brongnartii (J), Blv., Diet. sci. nat., xxvii., p. 142. 



1 The greater number of the species of Ommastrephes are mentioned, and 

 their systematic positions indicated in this paper, so I have not thought it 

 necessary to repeat the reference in every case. 



