348 Bulletin Vanderbilt Marine Museum, Vol. VII 



much dilated beyond the basal third. The proximal four pairs of 

 suckers are in two rows, these being succeeded by the four-row 

 arrangement, in which the series contains two modified papillae, 

 these being slenderer and more obliquely placed than the ordi- 

 nary pedicels. These are succeeded by about ten four-row series, 

 the suckers of which are globular, like those of the female, except 

 that the dorsal series are larger. Beyond the basal third the arm 

 is much enlarged, the two ventral rows of suckers are abruptly 

 replaced by a closely crowded, irregular series of specialized papil- 

 lae which are large, transversely elongate and compressed, with 

 a large mouth-like or slit-like aperture, the horny ring showing 

 on the opposed outer half and bearing a continuous series of ten to 

 twelve small jagged triangular teeth, while the inner half is pro- 

 duced forward over the aperture, in the form of a wide convex, 

 marginally rounded process, lip-like, with the free rounded mar- 

 gin separated by only a narrowed crescentic aperture. Above and 

 overarching but distinct from this chitinous lip is the fleshy, thick, 

 rounded opposite "upper lip" of the papilla. The suckers of the 

 two dorsal series continue unspecialized for two or three pairs 

 beyond the point at which the ventral one becomes specialized, 

 when the dorsal series of suckers also becomes modified, forming 

 a crowded alternating double series of dilated tubercles, but hav- 

 ing the pedicels not transversely compressed and not so closely 

 crowded together as are the vertical series. 



The right dorsal arm is slenderer than the left and more nearly 

 resembles the female arm than do any of the others of the series. 

 The suckers are small, closely crowded, especially in the median 

 rows, and the ventral row of suckers are smaller than the dorsal 

 series. 



The second pair of arms have the suckers comprising the outer 

 rows definitely larger than those of the inner series, four to six 

 of the proximal suckers of the dorsal series being distinctly larger 

 than the remainder of this series ; in the ventral series on the distal 

 two-thirds of the arm there are seven or eight suckers, much en- 

 larged, occurring in alternation with the small suckers of about 

 one-third the diameter. 



The third pair of arms also have the suckers of the two mar- 

 ginal series larger than those of the two inner series, with eight 

 to ten alternately placed suckers of the distal portion of the verti- 

 cal series enlarged. The fourth pair of arms have a similar but 



