32 U.S. NATIONAL MUSEUM BULLETIN 234 



Description. — A single specimen of this species was collected 

 on the voyage to Hong Kong. The mantle is slender, roughly 

 elliptical in outline, and is broadest near the anterior margin. It is 

 strongly dorsoventrally flattened. The margin is produced in the 

 dorsomedian region, the lobe having the two sides of an equilateral 

 triangle, rounded slightly at the apex. Posteriorly, the mantle is 

 sharply pointed between the fins. VentraUy, the anterior margin 

 forms a rounded lappet on each side of the funnel, bordering the 

 shallow funnel excavation. 



The fins originate 3 to 5 mm. posterior to the margin of the mantle 

 and border it but are separate at the posterior end. The fins are 

 very narrow and attain their greatest width slightly anterior to the 

 midpoint. 



The funnel is small and stout. It extends about to the level of the 

 eyes but does not reach to the interbrachial area of IV. The locking 

 apparatus is very short and stout. The funnel organ could not be 

 distinguished but there is a small triangular valve. 



The head is large and somewhat flattened, with large eyes with 

 prominent ventral lids. The buccal membrane is seven-pointed and 

 without suckers. 



The arms are in the order 4.2.1 =:3; they are short and stout, 

 tapering to rather sharp points, except for I which has the tip slightly 

 expanded. There is a low web between the arms which is deepest 

 in sectors C and D but lacking in E. I, II, and III are in general 

 rounded on the aboral surface but IV is strongly flattened with a 

 prominent keel over its entire length. The suckers are quadriserial 

 and are bordered on each side by a low non-trabeculate protective 

 membrane. The sucker rings are smooth but are surrounded by a 

 narrow papillated band. 



The tentacles are long and slender, extending to the posterior 

 end of the body. The stalks are laterally compressed and flattened 

 orally. The club is small and lunate, with a strong dorsal membrane 

 which originates proximal to the carpal area and extends to the tip. 

 The suckers are bordered on each side by low protective membranes 

 which, however, do not unite proximally. The suckers appear to be 

 arranged in about six rows but the exact number is difiicult to discern. 

 Four or five of the suckers of the second row from the dorsal side are 

 about twice as large as the others of the hand region. The horny 

 rings of all the club suckers bear numerous minute teeth and are 

 surrounded by a narrow band of papillations. 



The surface is mostly smooth, but the mantle bears a few scattered 

 low ridgelike knobs. The color is yellowish but sprinkled with 

 many minute purplish chromatophores on mantle, fins, head, and 

 arms. 



