Argonauta.] CEPHALOPODA. 1067 



and third pairs without any internal groove, the third pair depressed 

 their whole length ; siphuncle united to the base of the arms by a 

 lateral membrane. Colour silvery-white or yellowish or with rosy 

 reflections, thickly punctate with red. 



Shell compressed, with close prominent bifurcating ribs on the sides 

 and sharp tubercles on the keels; aper ure rather narrow. White, 

 keels brownish. 



Hob. North Island of New Zealand ; Chatham Islands. 



The distribution of this species is almost cosmopolitan ; the type 

 is from the Mediterranean. 



2. Argonauta hians, Dillwyn, 1817. Plate 69, fig. 4. 



Argonauta hians, Dillwyn, Descr. Cat. Recent Shells, i, 1817, 334 ; d'Orbigny, 

 Ceph. acet., 1835, pi. 5 ; Adams and Reeve, Voy. Samarang, Moll., 

 pt. 1, 1848, 4, pi. 3, f. 2 ; Gray, Ceph. Antep., Brit. Mus. Cat., 1849, 33 ; 

 Tryon, Man. Conch. (1), i, 136, pi. 46, f. 100-2 ; Chall. Rep., xvi, 5 ; 

 Brazier, Cat. A.M., No. 15, 3 ; Ball, Bull. Mus. Comp. Zool., Harvard, 

 xliii, No. 6, 229. A. gondola, Dillwyn, I.e., 335 ; Adams and Reeve, I.e., 

 3, pi. 2 ; Conch. Icon., xii, pi. 4, f. 3. A. nitida, Lamarck, A.s.V., vii, 

 1822, 653. A. Owenii, Adams and Reeve, I.e., 4, pi. 3, f. 1. A. Kochiana, 

 Dunker, Zeitschr. f. Malak., 1852, 49. 



Animal small ; head long ; ventral aperture large ; aquiferous 

 openings 2 ; arms short, unequal, order of length 1, 2, 3, 4 ; the 

 webbed arms small, thick. 



Shell with distant ribs, laterally compressed tubercles on the carina ; 

 surface smooth, polished. 



Hob. A shell from Portland Island is in the Otago Museum, 

 Dunedin. Antilles ; South Atlantic ; Indo -Pacific region. 



3. Argonauta tuberculata, Shaw, 1790. Plate 71. 



Argonauta tuberculata, Shaw, Nat. Hist. Miscell., xxiii, 1790, tab. 995: 

 Bolten, Mus. Bolten., 1798, 71 ; d'Orbigny, Ceph. acet., 1835, 169, 

 Argonaute, pis. 3, 4 ; Crit. List, 16 ; M.N.Z.M., 2 ; Chenu, Man. de 

 Conch., i, 17, f. 45; Chall. Rep., xvi, 4. A. nodosa, Solander : Dieff. 

 N.Z., 244; C.M.M., 2; Man. Conch. (1), i, 140, pi. 50, f. 124; Brazier, 

 Cat. A.M., No- 15, 2 ; Dall, Bull. Mus. Comp. Zool., Harvard, xliii, 

 No. 6, 228 ; Pritchard and Gatliff, P.R.S. Vic. (n.s.), x, 242. A. vitrea, 

 Perry, Conchology, 1811, pi. 42, f. 1. A. tuberculosa, Schumacher, 

 Essai d'un Nouv. Syst., 1817, 260 ; Lamarck, A.s.V., vii, 1822, 632 ; 

 Reeve, Conch. Icon., xii, pi. 1. A. oryzata, Angas, P.Z.S., 1865, 156 ; 

 1867, 185 : McCoy, Zool. of Victoria, i, vii Decade, pis. 61, 62. A. 

 ,,,-acilis, T. W. Kirk, T.N.Z.I., xvii, 1884 (1885), 58, pi. 13; Chall. Rep., 

 xvi, 5, 220. 



Animal. Body acuminated behind : arms more webbed below 

 than above, unequal ; order of length 1, 2, 4, 3 ; the second and 

 third pairs keeled on the outer side ; the second pair depressed. 



Shell compressed, thin ; sides with transverse rugae, broken up into 

 tubercles ; tubercles of the keels rather sharp, elevated, and sometimes 

 laterally compressed ; margin with a spine or " ear " on either side. 



Hob. North Island of New Zealand ; Great Barrier Island ; Port- 

 land Island. Brazil ; Indian Ocean ; Cape of Good Hope. 



