96 U.S. NATIONAL MUSEUM BULLETIN 234 



protective membranes bordering the hooks and suckers on either 

 side. The arm hooks are small but widely curved and finely pointed. 



The tentacles are long and oval in cross-section with long, only 

 slightly expanded clubs. They are attached basally in the same 

 manner as is described for A. lucens (p. 108). 



The tentacular club is only sHghtly expanded, the tentacular hooks 

 and their associated suckers occupying about four-fifths of the club. 

 Proximally there is a carpal cluster which consists of about five small 

 cups and five buttons. Distal of the carpal cluster are six long, 

 widely open, slender hooks; the proximal and the distal hooks are 

 smaller than the other four, which are subequal. Dorsal to the hooks 

 is a distinct double row of small suckers, one pair to each hook but, 

 because the club is so elongate, they give the illusion of lying in a 

 single row along the dorsal border of the club as in Quoy and Gaimard's 

 figure. In the smaller specimens the suckers actually He in a single 

 row, their exact position and relation to each other being diflicult to 

 ascertain. 



Distad of the hooks lie four rows of small suckers which extend 

 to the distal extremity. Dorsally a protective membrane which 

 borders the suckers of the hand part originates opposite the first hook 

 and terminates at the distal-most hook. Ventrally a low indistinct 

 membrane borders the proximal half of the club. On the outer 

 surface a swimming membrane or keel originates opposite the third 

 hook and extends outward to the tip of the club. 



The light organs are numerous and probably conspicuous in fresh 

 specimens. They are of three sizes, large, medium, and small, are 

 scattered profusely over the ventral mantle surface and the funnel, 

 and are arranged in regular rows on the ventral surface of the head, 

 on arms III and IV, and on the base of arms II. 



The ventral surface of the mantle bears numerous light organs 

 somewhat symmetrically arranged. On the midline there is a clear 

 streak bordered on either side by a distinct row of photophores. On 

 the sides of the mantle and dorsally the light organs decrease in 

 number. Dorsally they are very few, but there are three pairs of 

 photophores on the fins near the midline, the two anterior pairs 

 somewhat widely spaced, the posterior pair quite close together. 



On the ventral surface of the funnel are about 30 light organs 

 symmetrically placed as shown in the figure. 



The ventral surface of the head bears a circlet of light organs 

 around each eye and five distinct rows of light organs lying between 

 these. They are arranged as follows: thirty around the right eye, 

 lacking near the siaus, numerous ventrally, and sparse dorsally. 

 Around the left eye about 21, numerous ventrally, sparse dorsally, 



