of Edinburgh, Session 1884-85. 
113 
- Amphitretus, Hoyle. 
Amphitretus pelagicus, Hoyle. 
Amphitretus pelagicus , Hoyle, Ann. and Mag. Nat. Hist., ser. 5, vol. 
xv. p. 235, 1885. 
The Body is short, rounded, of gelatinous constituency, and semi- 
transparent. The mantle adheres to the sides of the siphon, so that 
the mantle-opening , which is single in all other known Cephalopods, 
is here divided into two pocket-like openings, which lie one beneath 
each eye. The siphon is very long and narrow, and extends forwards 
anteriorly to the margin of the mantle, for a distance almost equal 
to the length of the body, and is a little swollen at the extremity. 
The Head is not marked off from the body, except by the posses- 
sion of the eyes , which are situated near together on the dorsal 
Amphitretus pelagicus, Hoyle (-f. ) 
surface ; they consist of a larger basal spheroid, through the walls 
of which pigment is clearly visible, upon which stands a smaller 
Very prominent spheroid, white, opaque, and of glistening surface. 
The Arms are equal, and rather more than twice as long as the 
body j they are slender, and taper at first gradually and then more 
rapidly to comparatively blunt points. The umbrella extends more 
than two-thirds up the arms, and is thin, delicate, transparent, and 
much damaged. The suckers are firm, muscular cups embedded in 
the softer tissue of the arms, as in Cirroteuthis ; there are about 
twelve placed at some distance apart on that portion of the arm up 
VOL. XIII. 
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