56 U.S. NATIONAL MUSEUM BULLETIN 291 



ventral arms, the sucker rows do not become so irregular and the 

 suckers are not nearly so numerous as on the dorsal three pairs of arms. 

 Suckers extend to the extreme distal tips of all the arms. 



About 275 suckers occur on each of the dorsal six arms of the holo- 

 type. The dorsal arms may have very slightly fewer, and the ventral 

 arms have around 150 suckers each. A specimen 23 mm ML {Velero 

 10540) has 175-185 suckers on arms I-III and 110 on arms IV. A 

 specimen 12 mm ML (Velero 10730) has 62-75 suckers on arms I-III 

 and 48 suckers on arms IV. 



Inner sucker rings from the arms bear 10-14 very low, small, 

 rounded or subtriangular, knoblike teeth (pi. 11c-f). Outer rings are 

 made up of concentric rows of tiny chitinous bumps or pebbles. 



Both tentacles are missing from the holotype, probably having been 

 lost during capture. In fact, the tentacles are broken off all but one 

 specimen that is available at this time. The specimen (Velero 10976) is 

 a juvenile 19 mm in mantle length. The single complete tentacle is long 

 (ca 20 mm) and robust. The club is short (ca 4.5 mm), unexpanded, 

 simple; no keels or membranes are present and no discrete divisions 

 into manus, carpus or dactylus exist (pi. 11b). About 7 to 8 rows of 

 very small suckers are distributed across the distal half of the club; 

 fewer rows occur proximally. Between 150 and 200 suckers are present 

 at this stage. The extreme distal portion of the club is reduced to a 

 small, papilla-like tip with a few minute bumps that are probably 

 precursors to future suckers. Inner sucker rings from the 19 mm speci- 

 men (VeIe7'o 10976) are extremely small, and it is difficult to deter- 

 mine the dentition. Rings varied from being nearly smooth or slightly 

 scalloped to having a few minute, low, subtriangular teeth as shown 

 in plate IIG, although the figure may exaggerate the size of the teeth. 

 The outer ring consists of concentric, pebbled rows. 



The buccal membrane is broad and heavily rugose. The seven buc- 

 cal lappets are long and bear 4 to 6 small suckers ; the inner chitinous 

 rings of the suckers have around 10 small, low, papilla-like teeth 

 (pi. 11h). The connections of the buccal membrane attach to the 

 dorsal oral edges of arms I, II, and IV and to the ventral oral edge 

 of arm III. 



The beaks are small and are darkly pigmented only on the rostra 

 (pi. 12c, d). Lamellae are lightly pigmented and fragile. The ros- 

 trum of the upper beak is strong, sharply curved, and hooklike. The 

 jaw angle is nearly a right angle. The rostrum of the lower beak is 

 short and blunt ; the jaw angle is obtuse. 



The radula has seven transverse rows of teeth and two rows of lateral 

 platelets (pi. 12a) . The rhachidian tooth has a broad base and a broad, 

 bluntly pointed median cusp. The concave lateral borders of the cusp 



