Putii,octpi(..\ < KPHALOPODA. 1065 



Genus 2. PINNOCTOPUS, d'Orbigny, 1845. 



Pinnoctopus, d'Orb., Moll. viv. et foss., i, 1845, 193, pi. 2. Type: P. cordi- 

 f or in is, Q. & G. 



Body oblong, with broad, lateral, wing-like expansions, which 

 extend in front and enfold all the body ; arms very long, with 2 

 rows of slightly prominent cups. 



New Zealand only. 



1. Pinnoctopus cordiformis, Quoy and Gaimard, 1832. Plate 70, 

 fig. 3. 



Octopus cordiformis, Q. & G., Voy. Astrol., Zool., ii, 1832, 87, pi. 6, f. 3 ; 

 Dieff. N.Z., 261 ; Crit. List., 1(5. Pinnoctopus cordiforniis, Q. & G., 

 Ad. G.R.M., i, 20; iii, pi. 1. f. 3: Chenu, Man. de Conch., i, 14, f. 35: 

 C.M.M., 1 : M.N.Z.M., 2: Chall. Hep., xvi, 14, 220: Index, 57: Suter, 

 Subantarct. Lslds. N.Z., i, 1909, 49: Tryon, Man. Conch. (1), i, 128, 

 pi. 40, f. 64. 



Body orbicular, tuberculate, winged ; arms long, nearly equal, 

 lateral ones shortest, with 2 rows of cups ; eyes rather prominent. 

 Colour red-brown ; arms with pale-blue lunules. 



Total length, 39 in. (990 mm.) ; length of body, Sin. (203 mm.). 



Type in the Mus. Hist. Nat., Paris. 



Hob. Tasman Bay (type) ; Hauraki Gulf ; Campbell Island 

 (Filhol). 



Fam. ARGONAUTID^I, Cantraine. 



Males and females naked or the female with a shell. Arms tapering, 

 very unequal ; cups prominent, in 2 series. Aquiferous pores near 

 the head or near the funnel are present. Mantle supported by 2 

 buttons fitting into grooves at the base of the siphuncle. The hecto- 

 cotylized arm autotomous. 



Genus 1. TREMOOTOPUS, delle Chiaje, 1830. 



Tremoctopus, delle Chiaje, Mem. Stor. Nat., 1830. Type: T. vioktceu*, 

 delle Chiaje. Philonexis, d'Orbigny, 1835. 



Body rounded, head large, band of the neck very small. Funnel 

 short. Two aquiferous pores in the neck. Third right arm hecto- 

 cotylized, fringed on the sides, and developed in a sack-like aperture 

 on the side of the head. 



Radula having the formula 3.1.3. 



Distribution. Atlantic, Mediterranean, Pacific, and Indian Ocean. 



1. Tremoctopus violaceus, delle Chiaje, 1830. Plate 70, fig. 4. 



Tremoctopus violaceus, delle Chiaje, Mem. Stor. Nat., 1830, pi. 70 : Verany, 

 Ceph. medit., 1851, 41, pis. 15, 16: Man. Conch. (1), i, 131, pi. 43, 

 f. 86-90; pi. 44, f. 93, 94: Chall. Rep., xvi, 6, 216. Octopus velatxs, 

 Rang, Mag. de Zool., 1837, 60, pi. 89. Philonexis velifer, d'Orbigny, 

 Ceph. acet., 1838, 91 : Poulpes, pis. 18-20; pi. 23, f. 2-4. Tremoctopus 

 violaceus, delle Chiaje : Verany, Ceph. medit., 1851, 41, pi. 14, f. 1. 



Body rather ovoid, truncated anteriorly, nearly smooth, violet ; 

 head short ; aquiferous pores, 4 on the back of the head and 6 small 



