BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Dimensions of Figured Specimen. 
Bene COAL u ee A 
EA ot OW 0990 now, 
STEHT OL MOUS r 8 e a VM 
Eye to edge of umbrella, dorsally . .'. . ... . 10 
Mantle-margin umbrella, ventrally . . .... 6 
Diameter of largest stikar -r son a 08 
Right. Left. 
HCHO OL Arat NNUS ar 25 
Kenr or second aro ny ae uu 198 23 
Length Of third arni. o s. . (about) 2d 22 
Length or touri atii ua 2 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 
sub-equal arms, up which the umbrella extends for a distance of about 1 mm. 
The body and umbrella are liberally besprinkled with minute brown chromato- 
phores; 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 24-97, 1900; surface 
lagoon, electric light ; three young specimens, (R. 112, 118, 121] 
These specimens are not specifically determinable ; their 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 
chromatophores, which are small and black on the proximal third, then larger 
and more reddish in tint. There isalso a patch of pale reddish chromatophores 
between the eyes and on the anterior part of the dorsal surface. The total 
length is 20 mm., and the arms about 10 mm., measured from a point just in 
front of the eye. 
20. Polypus, sp. 
Habitat. — Makatea Island, Paumotu Archi pelago; October 6, 1899 ; shore ; 
one young specimen. [H. 125.] 
Makemo Island, Paumotu Archipelago; October 19 or 20, 1899; lagoon ; 
one young specimen. [H. 124.] 
This small Octopus, measuring about 3 cm. in total length, has no very 
striking characteristics, and in view of the inadequacy of our knowledge of 
! Measured from a point opposite the centre of the eye. 
