302 
BULLETIN OF THE BUREAU OF FISHERIES. 
ridges which are usually bilaterally arranged on either side of the body. The most conspicuous of these 
ridges are two median and two lateral ones, which between them inclose a diamond-^aped space on 
the dorsum similar to that already described for P. marmoratus. There is also a large blunt tubercle 
above and just behind the center of each eye opening, but this is often so flattened in preserved specimens 
as to be quite obscure. Mantle opening wide, extending for a little more 
than half the circumference. 
Head large, elevated, rounded, slightly flattened above. Eyes prom- 
inent, with rather large openings. Funnel small, conical; aperture narrow. 
Funnel organ W-shaped (fig. 17). 
Arms moderate, about twice as long as the head and body together; 
connected at the base by a fleshy umbrella which is best developed between 
the ventral arms, extending between them for about a quarter of their length; 
subequal, except the dorsal pair, which are a little the shortest, the order of 
length 3=4=2, i; marginal membrane well developed. Suckers rather large, 
elevated, the first two or three in a single line, the remainder placed moder- 
ately close together in two alternating rows. 
Chromatophores few below; extremely numerous on the dorsal stuface 
where they appear as exceedingly fine dark punctations. Color in alcohol 
brownish gray, heavily clouded above with a somewhat darker shade. A 
very dark stripe borders the upper margin of each arm, while a broad triangular area of a pale color just 
includes the ocular aperture within its apex and is bounded dorsally by a dark wedgeshaped stripe in 
front of the eye and a similar one just behind, an arrangement which may be roughly represented by 
the use of a diagram (fig. 18). There are no ocular markings. 
The youngest specimen seen (station 3849) differs from that just described . 
in that a few scattered chromatophores are evident on the ventral as well as 
the dorsal surface, and certain others are evident as two extremely regular rows 
of distinct round dots extending along tire outer surface of each of the four 
ventral arms; on the arms of the third pair, however, the dorsal row is almost 
completely hidden by the prevailing dark coloration. In a somewhat larger 
individual (station 3905) this peculiar arrangement of the chromatophores is still 
to be made out but has become much more obscure. Both these specimens have 
a wider head and more globose body than the larger one above described. 
Another specimen taken on the reef at Honolulu by Dr. Jenkins is probably 
the same, the numerous small differences being apparently due to the better 
preservation of the Albatross material. The papillae are here considerably less prominent so that their 
arrangement is more difficult to determine, and the umbrella is considerably shorter between the 
ventral arms than it is above. 
Fig. 17 . — Polypus r I180], out- 
line drawing of funnel laid 
open medioventrally to ex- 
pose the funnel organ, X 2. 
Fig. 18 . — Polypus r, dia- 
grammatic representa- 
tion of color pattern in re- 
gion of left eye of speci- 
men from Honolulu [180]. 
Measurements op Three Largest Individuals of Polypus y . 
Author’s register 
Sex 
Total length 
Tip of body to base of dorsal arms 
Length of body 
Width of body 
Width of neck 
Width of head 
Length of — 
Right dorsal arm 
Left dorsal arm 
Right second arm 
180 
188 
203 
? 
? 
$ 
mm. 
mm. 
mm. 
143 
120 
77 
46 
25 
25 
30 
17 
18 
22 
17 
16 
17-5 
14 
13 
20 
17 
14 
87 
84 
31 
57 + 
82 
40 
95 
90 
51 
Author’s register. 
Sex . 
Length of — 
Left second arm 
Right third arm 
Left third arm 
Right ventral arm 
Left ventral arm 
Umbrella between dorsal arms . . 
Umbrella between ventral arms . 
Diameter of largest suckers 
Diameter of mantle opening 
Length of funnel 
180 
188 
203 
s 
5 
$ 
mm. 
mm. 
mm. 
92 
95 
48 
94 
9 X 
so 
97 
92 
47 
93 
88 
SI 
96 
90 
52 
16 
18 
6 
22 
IS 
12 
3-5 
3 
2 
16.5 
13 
II. s 
13 
xz 
IZ 
