FISHERY BULLETIN: VOL. 80. NO. 4 



about one-third. The swimming keel of arm III is 

 about as wide as the arm. The tentacular sheath 

 is narrow, about half the width of arm IV near 

 the base. The dorsal and ventral protective mem- 

 branes are developed on all the arms and extend 

 to the arm tips. The ventral membranes are 

 wider on arm III, although they do not reach the 

 top of the hooks. The protective membranes of 

 arm IV are very narrow, except those on the 

 hectocotylus of the male. 



The ventral protective membrane of right arm 

 IV (hectocotylus) of the immature male paratype 

 (ML 46 mm) is slightly enlarged into a narrow 

 undulating membrane, about' 1 mm wide, op- 

 posite the eighth and ninth pairs of hooks. The 

 dorsal protective membrane is very narrow. 



The arm hooks (Fig. 3E) are biserial and are 

 completely covered by sheaths. Arm IV is 

 slightly longer than the other arms, and has the 

 greatest number of hooks. The suckers on the 

 distal part of the arms can be separated into two 

 types. The distalmost suckers are markedly re- 

 duced in size, are globular in shape with small 

 apertures, and lack teeth. The proximal suckers 

 have long stalks and wide openings. The inner 

 rings of these suckers have eight to nine large 

 pointed teeth distally, very irregular, smaller 

 teeth proximally, and a wide shelf at the bottom 

 half. The outer ring bears numerous pegs (Fig. 

 3D). 



The tentacles are weakly developed, about as 

 long as the mantle (TLI 93.3-0&4-112.7) and very 

 narrow (only about one-third of the width of arm 

 III). The cross section is almost triangular. The 

 club is also narrow (Fig. 31). The aboral keel ex- 

 tends from opposite the second hook to the tip of 

 the club. Protective membranes are absent, but a 

 short hoodlike membrane is present at the blunt 

 tip. The carpal cluster is composed of a series of 

 three to six smooth-ringed suckers and three to 

 five rounded pads which are biserially arranged 

 in an elongate patch. One of the paratypes (ML 

 75 mm) has two additional suckers on the stalk 

 located a short distance from the right carpal 

 cluster (such suckers not present in other speci- 

 mens); corresponding pads, if any, were not seen 

 on the opposite tentacle due to damage. The 

 manus has a total of 9 to 11 sheathed hooks and 

 an occasional sucker in the distal part. These 

 alternating dorsal and ventral hooks are only 

 slightly separated medially. Hooks on the dorsal 

 row are smaller. The hooks (Fig. 3B) resemble 

 the arm hooks in structure, except for the rela- 

 tively narrower bases of club hooks and their 



relatively smaller size. The few (16 or 17) distal 

 suckers on the dactylus are also biserial. They 

 have long stalks and wide openings; the inner 

 rings have about 10 sharp teeth distally, a series 

 of smaller denticulations proximally, and an 

 inner shelf at the proximal bottom part(Fig. 3C). 

 The outer ring bears pegs. 



There are two types of skin photophores: Very 

 dark ones with whitish centers and white ones 

 with very thin outer black rings (in preserva- 

 tion). The smallest is about half the size of the 

 largest, but intermediate sizes occur. Both types 

 appear randomly interspersed. On the ventral 

 side of the mantle there are eight distinct rows 

 separated by spaces wider than the rows them- 

 selves. A continuous midline space is present 

 from the anterior of the mantle to the tail (Fig. 

 3A). Four parallel rows of varying widths lie on 

 either side of this space. The first and second 

 lateral rows extend from the excavated part of 

 the mantle to the tail. The third row extends 

 from opposite the lateral angle of the mantle to 

 the tip of the mantle, occurring along the lateral 

 margins of the tail as a single row of evenly 

 spaced photophores. The photophores of these 

 rows tend to disperse at the posterior end, par- 

 ticularly the second row, and the rows become 

 slightly intermingled, but each row remains rec- 

 ognizable. The fourth or lateralmost row is com- 

 posed of widely spaced light organs forming a 

 single line that becomes somewhat irregular op- 

 posite the region of the fins. Small photophores 

 are dispersed on the dorsal side of the mantle, but 

 there are none on the fins or on most of the tail 

 except for the lateral row mentioned above and a 

 few very small ones ventrally. A transverse row 

 that has fewer and more widely separated photo- 

 phores dorsally runs along the edge of the 

 mantle. 



Four narrow rows of photophores separated by 

 wide spaces are present on the ventral half of the 

 funnel. There are two additional rows on the 

 dorsal side, one on each side of the bridles. 



There are eight separate rows of photophores 

 on the ventral half of the head, four rows on each 

 side of a wide median space. The first row lateral 

 to the midline space originates anterior to the 

 bridle within the apex of the funnel groove and 

 continues directly to the ventral aboral side of 

 arm IV and ends just beyond the distalmost arm 

 hook. The second lateral row begins at the pos- 

 terior end of the funnel groove and runs along the 

 edge of the groove, over the ventral part of the 

 head, and proceeds anteriorly along the base of 



712 



