3°2 



BULLETIN OK 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-shaped 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, 1; 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 surface 

 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 the 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 [180I, 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 of Three Largest Individuals of Polypus 7*. 



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 



M3 

 46 



30 

 22 

 17-5 



87 



57+ 



95 



120 

 25 



17 

 17 

 14 



17 



84 

 82 

 90 



mm. 

 77 

 25 

 18 

 16 

 13 

 14 



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 



48' 



SO 

 47 

 51 

 52 

 6 

 12 



