28 o 
bulletin of the bureau of fisheries. 
Measurements of Argonauta bottgeri. 
mm. 
Total length (to tip of second arms) 59 
End of body to base of dorsal arms 23 
End of body to ventral margin of mantle 21 
Width of body near middle 10 
Width of mantle anteriorly 13 
Width across eyes 13 
Length of — 
Right dorsal arm to expanded portion (inside meas- 
ixrement) 15 
Left dorsal arm to expanded portion (inside meas- 
urement) 17 
Length of — mm. 
Right second arm (inside measurement) 36 
Left second arm (inside measurement) 35 
Right third arm (inside measurement) j8 
Left third arm (inside measurement) 31 
Right ventral arm (inside measurement) is-t- 
Left ventral arm (inside measurement) 22 
Funnel 15 
Diameter of largest suckers 2 
Diameter of shell 31 
Type . — ? 
Type locality. — Unknown. 
Distribution. — Mauritius (Smith); Chagos Islands (Smith); Mas- 
bate, Philippines (Smith, Hidalgo); China Sea (Smith); Australia 
(Smith); Hawaiian Islands (Albatross). 
Specimens examined. — A single adult female containing a hecto- 
cotylus and numerous embryos was taken by the Albatross in the 
surface net at station 3927, latitude, 21° 31' N., longitude, 161° 55' W., 
between Honolulu and Laysan Island. The specimen constitutes 
catalogue No. 214377 United States National Museum [S. S. B. 165]. 
Remarks. — Argonauta bottgeri is not only one of the smallest 
species of the genus, but one of the most delicately beautiful as well. 
Its discovery in Hawaiian waters extends its known distribution many 
thousand miles to the northeast, and further enables me to publish 
the first detailed description of the animal. When compared with the 
Mediterranean A. argo (see Jatta 1896, p. 191, pi. 8, fig. 3, pi. 18, fig. 
15-29), which is the only other form of which I have seen a complete 
account, important differences are formd to be numerous. Most 
obvious are perhaps the following: In A. argo the ventral arms are 
longest, the tliird pair shortest; the body is shorter and more inflated; 
also the suckers are larger and more crowded, and the eyes are larger. 
Details in the shape and proportions of the funnel organ (narrower in 
A. argo), hectocotylus (also narrower in A. argo), and other structures 
are also noteworthy. The shell of the present species seems unique 
in its small size, compact coil, and the circumstance that the atuicular expansion at the sides of the 
aperture, so frequently developed in other species of the genus, are here notable only for their entire 
absence. 
With the exception of tire detached hectocotylus as above described, the male of this species was 
not encountered by the Albatross, so unfortunately is still unknown. 
Fig. 7. — Argonauta bottgeri, hectoco- 
tylus of male (165], X 8. 
Argonauta species. 
Argonauta {argo Liunsus ?) Berry 1909, p. 418 (locality record only). 
From a depth of 127-128 fathoms in the Pailolo Channel, Albatross station 3857, were obtained a 
few badly shattered fragments of a shell which is clearly not referable to A . bottgeri [S. S. B. 216]. The 
nearly complete columella sliows the shell to have been auriculate in form, which would indicate that 
the species represented is probably of the group of A. argo and possibly close to A. pacijica Dali. The 
stulace of the fragments shows a fine, almost obsolete granulation. 
