20 bulletin: museum of comparative zoology. 



Dimensions of Fujured Specimen. 



mm. 



Length, total «17 



End of body to eye 12 



Breadth of body 14 



Eye to edge of umbrella, dorsally 10 



Mantle-margin umbrella, ventrally 6 



Diameter of largest sucker 0.6 



Eight. Left. 



Length of first arm i 25 25 



Length of second arm 23 23 



Length of third arm (about) 22 22 



Length of fourth arm 20 20 



18. Polypus, sp. 



Habitat. — Papiete, Tahiti; on the reefs; November 14, 1899; one young 

 specimen. [H. 146.] 



A young Octopus, 11 mm. in total length, -with a short bursiform body and 

 sul>-equal amis, up vhich the umbrella extends for a distance of about 1 mm. 

 The body and umbrella are liberally besprinkled with minute brown chromato- 

 phore^ ; there is a single row of large pale red chromatophores along the outer 

 aspect of each arm and there is a single similar one above each eye. 



19. Polypus, sp. 



Habitat. — Arhno Atoll, Marshall Islands; January 24-27, 1900; surface 

 lagoon, electric liglit ; three young specimens. [H. 112, 113, 121.] 



These specimens are not specifically determinable ; tlieir most prominent 

 characteristics are that the arms are sub-equal, the laterals being slightly larger 

 than the dorsal or ventral. Each arm has on its outer surface a double row of 

 chnjmatophores, which are small and black on the proximal third, then larger 

 and more reddish in tint. There is also a patch of pale reddish chromatophores 

 between the eyes ami (m the anterior part of the dor.sal surface. The total 

 length is 20 mm., and the arms about 10 mm., measured from a point just iu 

 front of the eye. 



20. Polypu3. sp. 



Habitat. — Makatea Island, Paumotu Archipelago; October 6, 1899 ; shore ; 

 one young .specimen. [H. 12').] 



Mukcmo Island, Paumotu Archipelago; October 19 or 20, 1899; lagoon ; 

 one young specimen, [il. 124.] 



This small Octopus, mea.<«uring about 3 cm. in total length, has no very 

 striking characteristic*, and in view of the inadeijuacy of our knowledge of 



• Measured from a point opposite the centre of the eye. 



