CEPHALOPODA. — BERRY. 235 



the arm so imperceptibly that they are scarcely to be sepa- 

 rately distinguished except by their smaller suckers and 

 sharper ridges on their outer surfaces, the same being true of 

 the left arm as well ; on the right arm dorsal marginal weh 

 terminating at the 12th sucker, the succeeding papillae 

 (PI. Ixvi., figs. 5, 6) relatively weakly developed, for the most 

 part bearing minute terminal suckers, though here and there 

 a few are lost ; suckers of ventral series persistent to tip of 

 arm, the ventral marginal membrane on this portion of the 

 arm wide and trabeculate, the trabeculse Aveakly duplex and 

 very evidently the precursors of the comb-like ridges seen in 

 the adult, although the membrane itself is here proportionally 

 a more conspicuous part of the structure. Specimens inter- 

 mediate in size between that just described and the fully 

 formed adult give confinnatory evidence (PI. Ixvi., figs. 3, 4) 

 that as the modified sucker bases gradually attain their final 

 development, both the distal and proximal suckers of the arm 

 gradually fall away, although in some specimens the loss 

 would appear to take place in very irregular fashion (cf. 

 Table IX.). 



Fig. 13. — Nototodarus gouldi J [548], horny ring of sixth sucker from 

 base in ventral row of left third arm of largest specimen ; camera drawing 

 from a mount in balsam. 



Fig. 14. — Horny ring from dorso-marginal sucker of left tentacle club of 

 same specimen, taken from approximately same horizontal level on club 

 as that shown in Fig. 16. 



Fig. 15. — Horny ring of second carpal sucker of left tentacle club of 

 same specimen. 



Fig. 16. — Horny ring of largest sucker on central region of left tentacle 

 club of same specimen. 



Fig. 17. — Horny ring of sucker of sixth pair from base of right second arm 

 of a smaller specimen [519]. 



Fig. 18. — Horny ring of small marginal sucker from near middle of left 

 tentacle club of same specimen. 



Fig. 19. — Hornj' ring of large median sucker from near middle of left 

 tentacle club of same specimen. 



Fig. 20. — Nototodarus gouldi <J (549], horny ring of sixth sucker from 

 base of ventral row of left third arm of large male. 



Fig. 21. — Hornj' ring from dorso-marginal sucker of left tentacle club 

 of same specimen, taken from approximately same horizontal level on club 

 as that shown in Fig. 23. 



Fig. 22. — Horny ring of second carpal sucker of left tentacle club of same 

 specimen. 



Fig. 23. — Horny ring of largest sucker on central region of left tentacle 

 club of same specimen. 



