148 U.S. NATIONAL MUSEUM BULLETIN 234 



characters of the genus. In about half of the specimens available to 

 me from the Philippines the right ventral arm is hectocotylized, in 

 the remainder the left ventral arm. Neither Lonnberg's nor Sasaki's 

 description of the modification fits the present specimens. In the 

 largest specimen, of 157.0 mm. mantle length, both ventral arms are 

 of equal length. On the right arm the suckers are in two rows prox- 

 imally and of normal size for the first eight pairs. Distal to these 

 at about the midpoint of the arm the suckers abruptly decrease in 

 size and are only about a third the size of the larger ones. Distal of 

 this point the small suckers are arranged in two rows, which are 

 slightly diverging, to the distal quarter of the arm where the outer 

 row turns outward to the margin of the arm and terminate. Imme- 

 diately opposite the end of the outer row the suckers of the inner row 

 become roundly triangular, fat, and fleshy, and the small apperture 

 is located in the ventral or marginal part of the sucker. From there 

 to the point of the arm, the suckers are crowded upon each other, 

 giving at times the appearance of two crowded rows along the ventral 

 border of the arm. Contrary to Sasaki's description, the protective 

 membranes persist on the distal portion, at least ventrally, and the 

 swimming membrane on the dorsal side is well developed and in the 

 preserved specunens pulls the tip upward so that it curls along the 

 distal quarter of the arm. In those specimens in which the left 

 ventral arm is hectocotylized the appearance and structure is an 

 identical mirror image. Its fellow is always normal in all respects 

 that could be seen. 



The tentacles are short (TLI 34.0-66.0) and rounded in cross-section, 

 flattened in the oral aspect, with a small median groove. The clubs 

 are only shghtly expanded and constitute 14.0 to 25.0 percent of the 

 tentacles. In the largest specimen the tentacular stalk bears 13 

 pairs of small suckers alternating with about the same number of 

 smaU round pads or buttons. There are four rows of suckers on the 

 clubs, those of the hand part about 4 times the diameter of the smaller 

 distal suckers. On both borders of the club are protective membranes 

 which originate at the carpus and extent to the tip. On the aboral 

 surface of the club a swimming membrane originates at the midpoint 

 and extends to the tip as a low raised ridge. 



There are no photophores on the body or in the mantle cavity, but 

 14 small round light organs are arranged in a regular pattern on the 

 eyeball. Around the iris proper are six fight organs, two small ones 

 above the iris, one on either side, and two larger ones below it. On 

 the inner surface of the periphery of the eyeball are eight larger 

 photophores, the row beginning and ending near the iris but lying on 

 on the inner surface of the eyeball in the ventral portion. 



