278 
BUIvLtETIN oe the bureau of fisheries. 
Head small and very indistinctly delimited because so deeply embraced in the mantle. Eyes 
large, spherical, protruding, a distinct constriction separating them from tlie head at the base. Fun- 
nel of robust proportions, but thin-walled and extremely long, reaching nearly midway of tlie ventral 
arms; broad at the base, but thence rapidly ta- 
pering to the simple circular aperture at the 
apex. Funnel organ prominent, of a whitish 
color; it comprises a large /\ -shaped cushion on 
the dorsal wall a little anterior of the middle, 
and a somewhat shorter and narrower elongate- 
ovate organ on either side of the ventral wall 
just below it (fig. 5). Locking apparatus well 
developed; just behind and a little below the 
eye, tlie basal margin of the funnel on eitlrer side 
is furnished with a small cartilaginous pit-like 
depression, which articulates with a posteriorly 
directed, roughly hook-like nodule on the inner 
surface of the mantle; just outside this nodule 
and passing below it parallel to the mantle mar- 
gin, a shallow, though distinct, groove coincides 
%vith a similar sulcus on the outer surface of the 
mantle, so that the constriction thus formed 
renders very prominent the thickened band of 
transverse muscle bordering the mantle opening. 
Arms of moderate length, perhaps half again 
as long as body, sharply separated from body 
at base by a deep sulcus; order of length 1,2, 3, 
4; dorsal arms somewhat the thickest and strong- 
est as well as the longest, their distal portions 
furnished with the usual conspicuous wing-like 
expansions of tlie marginal membrane, much 
wrinkled and contracted in preserved speci- 
Fig. 3. — Argonauta hottgeri, lateral view of female [165], X 2. 
Drawn by R. L. Hudson. The drawing does not show the 
characteristic flexures cf the body. 
mens so that its exact outline is very difficult of 
determination; remaining arms broad at the base, but 
rapidly tapering to an attenuate extremity. Um- 
brellarudimentary, comprising only a short fold inter- 
webbing all the arms for a distance of about three 
millimeters from their base. Suckers very large, 
much elevated, 40 to 50 or more in number on each 
arm (on the dorsal arms over 50 suckers in each row, ^.-Argonauta bSUgeri. lateral view of shell of female 
on thesecond and third arms about 30 in each row, and [165], x 2. Drawn by R. D Hudson, 
on tlie ventral arms about 18 to 20 in each row); com- 
pactly and very regularly ranked in two alternating rows, which on the second arm (and to a very slight 
degree on the others as well) become ultra-marginal and very widely separated distally (pi. xbviii,fig. 5); 
cups flattened and discoid; both rows persistent tothetipsof all the arms, though vastly reduced on the 
