48 U.S. NATIONAL MUSEUM BULLETIN 291 



suckers from the third arms of a 26 mm specimen are 0.10 mm in dia- 

 meter and bear about 20-22 closely packed protuberances. The most 

 distal 4 or 5 teeth are relatively long and robust and are bluntly 

 rounded. The four lateral teeth on each side are reduced in size and 

 these grade into the eight blunt knobs that occur on the proximal part 

 of the ring. 



The apertures of the largest suckers from the fourth arms are 0.14 

 mm in diameter and bear 18-26 (average 21) short, closely packed, 

 truncate teeth that are longer distally, blunter and stubby proximally 

 (p1.9g). 



The largest sucker rings from the tentacular club are 0.08-0.10 mm 

 in diameter and bear 8-10 extremely small, widely spaced, truncate 

 teeth that are elongate on the distal half of the aperture and knoblike 

 on the proximal half (pi. 9i) . 



The aperture of the tentacular club sucker from the specimen 27 mm 

 in ML is 0.06 mm in diameter and bears about eight small protuber- 

 ances: four relatively long, bluntly rounded, evenly spaced teeth on 

 the distal border ; two slender, blunter teeth on the lateral border ; and 

 two short, blunt, widely spaced knobs on the proximal border. 



The suckers of the buccal lappets of the holotype have aperture 

 diameters of 0.08-0.10 mm, and they possess 8 to 12 widely spaced, 

 minute, truncate teeth (pi. 9h). The apertures from the 26 mm speci- 

 men measure 0.06 mm in diameter. 



During ontogeny there is an increase in the number of teeth on the 

 sucker rings; plate lOr, g, h, shows rings with 7, 13, and 18 teeth from 

 specimens of 11, 16, and 29 mm ML. 



The large, fleshy, rugose buccal membrane has seven points; the 

 buccal connectives have an attachment formula of DDVD (pi. 8f). 

 From one to five minute suckers occur on each of the buccal lappets 

 (pi. 8a). The suckers are about 0.06-0.10 mm in diameter across the 

 aperture and bear 8-12 truncate to rounded teeth (pi. 9h). 



The buccal mass and the beaks are very small for the size of the 

 animal. The rostra of the beaks are black but the pigmentation de- 

 creases markedly on the lamellae. The rostra are strong but the 

 lamellae are very weak, thin, and fragile. The rostrum of the upper 

 beak is long, curved, and sharply pointed (pi. 8c). The jaw angle at 

 the junction of the rostnnn and the rostral lamella is nearly a right 

 angle, and the anterior border of the rostral lamella is slightly convex. 

 The dorsal outline of the palatine lamella is nearly flat, not curved; 

 the ventral outline is nearly semicircular. The rostrum of the lower 

 jaw is short and blunt; the jaw angle is a smooth curve (pi. 8d). The 

 rostral lamella is long; the insertion plate of the gular lamella is broad 

 and, posteriorly, it is subangular. 



