90 U.S. NATIONAL MUSEUM BULLETIN 234 



The arms are in the order 4.3.2.1, m the female in the order 3.2.4.1. 

 All the arms are keeled but in a different manner. I is short, slender, 

 flattened laterally with a sharp, strong, dorsal keel extending from 

 the base to the tip. II is keeled on both the dorsal and ventral 

 borders but not on the aboral surface. Ill is keeled prominently 

 from the base to the tip, the keel broadest in the posterior third. 

 IV is keeled only on the inner border. The suckers are biserial on 

 all the arms. The horny rings are armed with about five long square 

 truncate teeth on the distal margin and are entire proximally. 



The left ventral arm is hectocotylized by a modification of the 

 suckers on the distal half. The proximal suckers are normal. At 

 about the middle of the arm, the suckers abruptly are transformed 

 into long stout pedicels, those of each row turned strongly outward 

 and becoming smaller towards the tip of the arm. Only the first 

 one or two pedicels are equipped with tiny fleshy suckers. The right 

 ventral arm appears normal. 



The tentacles are short, flattened, with a sharp ridge on either side. 

 The club is short, little expanded. On the ventral surface a low 

 protective membrane extends to the tip of the club. On the dorsal 

 surface a low trabeculate membrane originates at the carpal region 

 and extends along the hand part only. The low dorsal keel of the 

 stalk expands near the carpal region and extends as a wide membrane 

 or web along the length of the club to the distal extremity. The 

 suckers are in four rows, the ring bearing about 15 short truncate 

 teeth, largest on the distal border. 



The buccal membrane is seven-pointed, each lappet bearing five 

 to seven small suckers near the tip. 



The gladius has been described by Rehder (1945). It is very 

 narrow with no prominent expansion. A strong central ridge runs 

 the length of the pen, and a lateral ridge occurs on each side just 

 below the anterior point. About a third of the distance from the 

 anterior end, a slight broadening occurs with a marginal border 

 formed outside of the lateral ridge. Posteriorly the pen narrows 

 with the margins turned inward to form a narrow groove. 



The color in alcohol is yellowish brown with large reddish-bro^vn 

 chromatophores densely packed in the midline and scattered laterally. 

 The stripe is narrower and denser in the males than in the females. 

 The dorsal surface of the head also is heavily pigmented. 



