CEPHAIvOPODA OP THE HAWAIIAN ISLANDS . 
337 
Fins fairly large, a little over one-fourth as long as the mantle; each one taken singly, a little longer 
than broad; barely separated in the medio-dorsal line by the narrow membrane covering the slender 
gladius, which extends past them as an acute point. 
Head small, flattened, elongate, distinctly wider than the stalklike neck. Eyes large, little pro- 
jecting; their apertures ample, with a slight obtuse anterior sinus. Funnel large, thin-walled, only 
its tip protruding beyond the mantle margin; valve minute. Funicular locking cartilages simple, 
with nearly straight grooves. 
Arms conspicuously unequal, their order of length 2, 3, 4, 1; the lateral arms not only immensely 
longer than those of the dorsal and ventral pairs, but also more robust in every way; dorsal arms exceed- 
ingly short and weak, slightly recurved; the length of the second arms is about 5 to 6 times that of the 
dorsals, the third arms about 4^ times, and tlie ventrals 2^ to 3X times; lateral arms usually a little 
more than half as long as the body, exceedingly slender and graceful, with a delicate narrow membrane 
or keel along their outward aspect. Suckers small, not crowded; pedicels conical; horny rings toothed. 
Tentacles more robust, thicker, and much longer than any of the arms, attaining approximately 
twice the length of the second pair. Club little expanded; distal portion tapering and with a con- 
spicuous dorsal keel; at this region the inner face of tlie club bears four rows of minute suckers (homy 
rings toothed), which increase regularly in size from the dorsal to the ventral row, the latter suckers 
long pediceled and with a diameter about three times that of the dorsal ones; distally all tlie acetabula 
regularly diminish in proportion, but proximally to this region those of the dorsal row about maintain 
their size, the remaining rows diminishing in size but greatly increasing in number so that we hence- 
forth find at least eight closely crowded series of minute subequal suckers extending for perhaps a third 
the length of the tentacle, after which they again thin out; two of the rows continue down the stalk 
in distantly placed alternating series for another third of its length. 
Gladius long, slender, consisting chiefly of the rhachis, and terminating in a delicate hollow cone; 
midrib visible through the dorsal integument as a narrow hom-colored line. 
Color in alcohol everywhere a very pale brownish buff, the head and eyes darker; head brown, 
eyes with a slaty tone. Chromatophores sparse, pale, indistinct; a longitudinally-arranged series 
extends along the dorsal aspect of the mantle on either side of the gladius. 
Measurements op TRACHEtoTEuxms riisei. 
Number in author’s register 
280 
280 
280 
280 
280 
280 
280 
mm. 
mm. 
mm. 
mtn. 
mm. 
mm. 
mm. 
Total length 
60 
59 
58 
58 
55 
55 
45 
Length, excluding tentacles 
46 
45 
46 
45 
41 
41 
33 
Tip of body to base of dorsal arms 
32 
31 
32 
31 
31 
30 
26 
Length of mantle, dorsal 
25 
24 
25 
23 
23 
23 
17 
Extreme length of fins 
6. s 
6-5 
7 
6 
6 
5-5 
3 
Width across fins 
10 
10 
11 
10 
9*5 
8.5 
7 
Width of mantle 
7 - 5 
6 
7-5 
7 
7 
7 
6 
width of head 
Length of — 
2- 5 
2-5 
3 
2- 5 
2-5 
2 -S 
3 
Head 
4 
3-5 
4-5 
3 - 5 
3-5 
4 
3 
Dorsal arm 
3 
2 - S 
2 - 5 
2 - 5 
2 
2 
i-S 
Second arm 
15 
14 
14 
13 
12 
11 
7 
Third arm 
II 
II 
12 
II 
9 
9 - 5 
6 
Ventral arm 
7 
7 
7 
8 
7 
5 
3 
Tentacle 
27 
25 
28 
27 
24 
24 
21 
Type . — In the Copenhagen Museum. 
Type ZocaZf/y.— Latitude 34° 40' S., longitude 7° W. {fide Hoyle). 
Distribution . — North Atlantic (Lonnberg); off coast of Ireland (Hoyle, Massy); Faeroe Channel 
(Fowler); Messina, Sicily (Weiss, Hoyle); Gulf of Naples (Jatta); coast of Morocco (Joubin); St. Paul 
Island (de Rochebrune) ; Zanzibar (Pfeffer); Indian Ocean (Hoyle) ; west coast of New Guinea (Hoyle); 
Solomon Islands (Pfeffer) ; Hawaiian Islands {A Ibatross ) ; between Honolulu and San Francisco, California 
(Albatross); Chile (Pfeffer). 
