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Note

1. Eyes
   1. Eye diameter 1/3 of head width.
      
      
2. Funnel
   1. Funnel organ not described.
      
      
3. Fins
   1. Width about 2/3 of length.
      
      
4. Gills
   1. Half-orange shape.
   2. Each gill with eight primary lamellae.
      
      
5. Optic lobes and nerves
   1. Unknown.
      
      
6. Digestive system
   1. Intestine long and forms loop.
   2. Digestive gland bilobed.
   

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   Figure. Ventral view of digestive system of O. albatrossi. Drawing from Sasaki (1929).
   

7. Male reproductive system
   

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   Figure. Ventral view of male reproductive system of O. albatrossi. Drawing from Sasaki (1929).

8. Female reproductive system
   

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   Figure. Ventral view of female reproductive system of O. albatrossi. Drawing from Sasaki (1929).

9. Shell
   1. Shell U-shaped.
   2. Saddle with a broad posterior groove.
   3. Wings terminate in sharp points.
   

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   Figure. Shell of O. albatrossi, oblique posterior view (upper drawing), dorsal view (lower drawing). Drawing from Sasaki (1929).

10. Pigmentation
    1. Oral surfaces deep purple, nearly black.
    2. Suckers somewhat lighter in color and more reddish.
    3. Aboral surfaces a light reddish-brown.
    4. Areolae present in 8 series of white spots running along the arms. All series continue onto head, arm I series reach behind eyes.
    

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    Figure. Dorsal and lateral views of a young O. albatrossi. Drawing from Sasaki (1929).

11. Measurements

    Sex	Female ?
    Total length, mm	200
    Mantle length (venral)	36
    Head width	75
    Fin length	23
    Fin width	20
    Max. sucker diam.	3

Comments

The above description is from Sasaki, 1929.

References

Sasaki, M. 1929. A monograph of the dibranchiate cephalopods of the Japanese and adjacent waters. Journal of the College of Agriculture, Hokkaido Imperial University, 20(Supplementary number):1-357.