294 "■ ENDEAVOUR " SCIENTIFIC RESULTS. 



arms, and perhaps the smaller size. The sum total of these 

 features is an ensemble rather ditEcult to describe, but Avhich 

 very soon enables one to separate the two species with con- 

 siderable accvuacy almost as rapidly as the specimens can 

 be handled, and this seems to be true even aside from the 

 differences in color. 



The three small specimens from ff Eucla have a certain 

 facies of their own (PI. Ixxxvii., fig. 1 ; pi. Ixxxviii., fig. 1), 

 and I at first felt some doubt as to whether the}' might not 

 represent a third species. I am now inclined to think them 

 simply young persephone Avhich have chanced to be preserved 

 in the discoid phase. 



This species, particularly if the conclusions in the last 

 paragraph are true, finds its nearest relatives in the well- 

 known Japanese 0. depressa, and perhaps the curious little 

 0. medusoides, Thiele. At any rate these are the only species 

 with which it would seem to recpiire any special comparison. 

 It resembles both in the concentrically bicolored oral surface 

 and the pale aboral area, but 0. medusoides, which impresses 

 one as more or less juvenile in many of its characteristics, is 

 rather differently shaped and has larger fins, besides having 

 the inside cf the \\eb figured as reddish brown rather than 

 slaty. O. depressa differs notably in the siinple, straight, 

 bar-like form of the pteropallial cartilage, which does not 

 seem to extend forward to the fins as in the Australian species. 



LITERATURE CITED. 

 Berry, 8. S. 



1912. A catalogue of Japanese Cephalopoda. Proceedings 

 Academy Natural Sciences Philadelphia, 1912, p. 380-444, 

 text fig." 1-4, pi. 5-9. October 1912. 



1914. The Cephalopoda of the HaAvaiian Islands. Bulletin 

 United States Bureau Fisheries, v. 32, p. 255-362, text fig. 

 1-40, pi. 46-55. June 1914. 



Blainville, H. D. de 



1826. [Art.] Poiilpe. [In] Dictionnaire des Sciences Natu- 

 relles, v. 43, p. 170-214. 1826. 



Brazier, J, 



1892. Catalogue of the marine shells of Australia and 

 Tasmania. Part I Cephalopoda. Aiistralian Museum Cata- 

 logue, no. 15, p. i-vi, 1-17. 1892. 



