14 THE VOYAGE OP H.M.S. CHALLENGER. 



77. Octopus heteropus, Eafinesque. 



Octopus heteropus, Eaf., Precis deoouv. somiol., p. 28. 



Subgenus Tritaxeopus, Owen, 1881. 



78. Octopus cornutus (Owen). 



1881. Tritaxeopus cornutus, Owen, Trans. Zool. Soo. Lond., vol. xi., part 5, p. 131, pi. xxiii. 



Pinnoctopus, d'Orbigny, 1845. 



1. Pinnoctopus cordiformis (Quoy et Gaimard), d'Orbigny. 



1832. Octopus cordiforw.is, Q. et G., Voy. "Astrolabe," t. ii. p. 87, pi. vi. fig. 3. 

 1845. Pinnoctopus cordiformis, d'Orb., Moll, viv., p. 193, pi. ii. 



Cistopus, Gray, 1849. 



1. Cistopus indicus (Eapp, MS.), Gray.^ 



1838. Octopus indicus, d'Orb., Ceph. ac^t., p. 24; Poulpes, pi. xxv., pi. xxvi. figs. 1-4. 

 1849. Cistopus indicus, Gray, B.M.C., p. 20. 



SciBurgus, Troscbel, 1857. 



1. Scseurgus titanotus, Troscliel. . 



1857. Scseurgus titanotus, Trosch., ArcMv f. Naturgesob., Jabrg. xxiii. Bd, i. p. 51, Taf. iv. 



figs. 4, 5. 



1858. „ „ Troscb., Op. cit., Jabrg. xxiv. Bd. i. p. 298. 



2. Scseurgus unicirrhus (delle Cliiaje, MS.), Tiberi.^ 



1838. Octopus unicirrhus, d'Orb., C6pb. acet., p. 70. 



1851. „ Cocco, V^r., C(5pb. m(5dit., p. 22, pis. xii., xii. bis. 



1857. Scxurgus Coccoi, Trosch., Archiv f. Natiirgescb., Jabrg. xxiii. Bd. i. p. 57, Taf. iv. fig. 6. 



1880. ,, unicirrhus, Tiberi, Bull. soc. laal. ital., vol. vi. p. 12. 



3. Scseurgus tetracirrhus (delle Chiaje, MS.), Tiberi. 



1838. Octopus tetracirrhus, d'Orb., C(5ph. ac^t., p. 36 ; Poidpes, pi. xxii. 

 1851. ,, „ Ver., C6pb. m(5dit., p. 25, pi. viL Ms, figs. 1, 2. 



1880. Scseurgus tetracirrhus, Tiberi, Bull. mal. ital, vol. iv. p. 12. 



1882. Pteroctopus tetracirrhus, Fischer, Man. de Conch., p. 334. 



1 Just at the time of going to press Professor Steenstrup writes me that it is, in his opinion, very doubtful whether 

 d'Orhigny's two figures represent the same species. He is disposed to regard the type of Eapp's species as having been a 

 true Octopus, and for the form with pouches between the arms he has adopted the name Cistopus biirsarius. 



2 Verany {loo. cit., p. 24) admits that his Octopus cocco is identical with deUe Chiaje's Octopus unicirrhtis, and also 

 recognises the priority of the latter, under which circumstances there can be no doubt that the name has been rightly 

 restored by Dr. Tiberi. D'Orbigny regarded it as a synonym of Octopus vulgaris. 



