■610 LÖNNBERG, NOTES ON SOME RARE CBPHALOPaDS. 



rows on the ventral face contain in the median rows 14 — 16 

 »papillae» in the lateral rows 15 — 17. The third pair of arms is 

 the longest, the second and fourth next, the first smallest. The 

 three dorsal pairs are connected by an »umbrella» which extends 

 about three fifths up the dorsal arms and halfway iip the second 

 pair, and is of about the same breadth between tliem and the 

 third pair, but is absent between this and the fourth, and between 

 the fourth pair of arms themselves. The third pair is provided 

 with a web (»Schwimmhaut», Brock) which reaches to the tip. 

 The ventral arms attract by far the most interest as one of them 

 is hectocotylised. It is the left one that is transformed for that 

 purpose. Its suckers are much smaller than those of the other 



Fig. 2. Fig. 3. Fig. 4. 



One arm of the dorsal pair Left ventral arm hectoco- Tip of the same; strongly 



to show the well developed tylised ; 4 times enlarged. cnlarged. 



snekers; 4 times enlarged. 



-arms (as can be seen from the figs.) and decrease very rauch in size 

 towards the tip. In about sixteen pairs the lumen is compara- 

 tively large and very conspicuous, and the shape of a sucker can 

 still be discerned in 8—10 more pairs although modified, but 

 after that the suckers are completely transformed into about 16 

 transverse papillse (fig. 3 and 4) which become confluent at the 

 tip of the arm. These papiilae are not conical in shape as in 

 Loliginei and Ommatostrephini, but their truncate tips are as 

 broad as their basal parts (fig. 4). The right ventral arm is not 

 much modified. The suckers are smaller than those on the other 

 arms but have the shape of suckers nearly all along to the tip 

 of the arm where only a few of the last are rudimentary without 



