228 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



the rule in Mediterranean specimens, the angles being more vertically extended 

 than in most of the other species. 



B. 4. A. argo var. americana Dall, Bull. 37, U. S. Nat. Mus., 1889, p. 174, pi. 67, 

 figs. 1-3. East coast of the United States south of Cape Cod, and the West 

 Indies. 



This form is small, broad-backed, and strongly auriculate. 



B. 5. A. pacijica Dall, Amer. Nat, 1869, 3, p. 237; Amer. Journ. Conch., Nov., 



1871, 7, p. 96. 



This is more compressed than the americana and with pronounced auricles. Its 

 range extends from Monterey, California, south to the Galapagos Islands. 



C. A. bulleri Kirk, Trana. N. Zealand Inst., May, 1886, n. s., 1 (18), p. 138, pi. 4. 



New Zealand. 



This form has a wide auriculate aperture, and its sides slope rapidly to a narrow, 

 deeply channelled keel with particularly sharp compressed tubercles. This results 

 in a wedge-shaped form, apparently unique in the group. 



D. 1. A. nouryi Lorois ; see page 224 for synonymy and remarks. 



E. 1. A. dispar Conrad, Journ. Acad. Nat. Sci. Phiia., 1854, n. s., 2, p. 332, pi. 34, 



figs. 3, 3a. Locality unknown. 



This form, by its simple aperture and partly tuberculate dorsal channel, recalls 

 A. nouryi, which is however smaller, less compressed, and differently sculptured. 

 If ^. cornutalvis an inauriculate form, this species might represent it, judging 

 by the figures given by Conrad. 



E. 2. A. cornuta Conrad ; see page 224 for synonymy and remarks. 



F. 2. A. nodosa Solander, Portland Cat. 1786, p. 96, no. 2120, based on tlie form 



without auricles figured by Rumphius, Amboin. Rariteitk., pi. 18, fig. 1 ; 

 -f- A. oryzata Meusclien {ex parte), Mus. Gev., 1787, p. 252 ; + A. luberculata 

 Boiten, Mus. Bolt., 1798, p. 71; + ^. rotunda Perry, Conch., 1811, pi. 42, 

 fig. 2; -\- A. tubercnlatiis Shaw, Nat. Misc., 1811, 23, pi. 9'.»5; + A. gracilis 

 Kirk, Trans. N. Zeal. Inst., 1885, 17, p. 58, pi. 13, upper figs. Brazil ; Cape 

 of Good Hope, New Zealand, Indo Pacific. 



Meusc lien's species oryzata was a compound of Argonauta and Carinaria and 

 his nomenclature not Linncau. 



F. 1. A. hihnla Boiten, Mus. Bolt., 1798, p. 71, after Martini. Conch. Cat., 1769. 1, 

 pi. 18, fig. 100 = Nautilus pnpyracrus nurilus of Favannc, 1756, pi. 7, fig. 

 A. 7 ; -f A. tuberculosit Lamarck, An. s. Vert., 1822, 7, p. 652 ; + A. tubrrculata 

 Kirk, Trans. N. Zeal. Inst., 1885, 17, p. 58, pi. 13, lower figures ; + A. nodosa 

 forma aurita Martens, Ann. Mag. N. Hist., 1807, 3d scr., 20, p. 104. 



