154 U.S. NATIONAL MUSEUM BULLETIN 2 34 



In the right eye this organ appears to have a generally round shape; 

 it covers half of the lower surface of the eyeball; the lunar strip is 

 raised and prominent, an mdistinct line running from one horn to 

 the other outward and enclosing an expanse of skin with a slightly 

 lighter color than that of the rest of the bulbus. No other light organs 

 are evident. On the dorsal surface of the eyestalk in a patch at the 

 base of the bulbus a small patch of dark chromatophores extends as a 

 line down the stalk and back up the head part way to the arms. 



The buccal membrane appears to have six points and seven supports, 

 attached ventrally on arms III and IV and dorsallj^ on I and II. 



The arms are short and slender, arranged in a prominent brachial 

 crown, m the order 3.1.2.4. All the arms are nearly round in cross- 

 section and equipped with both dorsal and ventral protective mem- 

 branes with supports, but no swimming membranes. All the arms 

 with the exception of I are equipped with two rows of globular, 

 moderately large suckers with small apertures somewhat oval in 

 outline, the chitinous rings with smooth entire margins. The arms I 

 are especially slender and attenuated, and bear two rows of suckers of 

 normal size for the first pairs, or about a fourth of their length. Beyond 

 the fifth pair, the suckers become abruptly much smaller, about a 

 third of the diameter of the proximal ones, and lie in three or four 

 rows to the tips of the arms. The apertures are very minute. 



The tentacles are long and slender, round in cross-section, with a 

 prominent deep groove on the oral aspect. The club is only slightly 

 expanded and about 33.0 mm. in length. About 10.0 mm. from the 

 base ot the arms a series of minute suckers appear in what seems to be 

 a single row but which actually are alternate, and each successive 

 sucker is placed on opposite sides of the groove. At the seventh, the 

 suckers appear in pairs, minute, on stalks originating from prominent 

 bases, and directly opposite each other and in close contact. No 

 buttons are visible. At the 25th pair of stalk suckers, the club 

 originates without a distinct carpal area. The slightly expanded 

 clubs are bordered on either side by a delicate protective membrane 

 with supports which run the full length of the club. The suckers are 

 of moderate size, in four rows, large on the hand part and gradually 

 decreasing distally. They are somewhat oval in shape, raised on long 

 peduncles, and have semioval apertures which are truncate proximally 

 and rounded distally. They are equipped with eight or nine long 

 sharp curved teeth on the distal border and entire on the proximal 

 border. 



The viscera were laid bare and are shown in the figm-e. The gills 

 are small, located in the midpoint of the mantle, and are transverse in 

 position. The esophagus is dorsal, runs down to the area of the gills, 

 and turns back anteriorly, with a small semicircular caecum at the 



