CEPHALOPODA. — BERRY. 



271 



larger than those immediately preceding them,, and one 

 sucker of this pair appears to spring from the dorsal mem- 

 brane ; apical cap small for the size of the club. Giant 

 median suckers elevated, cylindrical, concave beneath, with 

 a distinct circular constriction aromid the middle ; their 

 apertures wide, the* horny rings (Fig. 57) large and smooth- 

 edged ; smaller suckers flatter and more oblique, their horny 

 rings also smooth. For an organ of such complexity the 

 amount of variation in the structure of the tentacle club 

 seems to be surprisingly small, as is indicated by Table XX. 



TABLE XX.— STRUCTURE OF TENTACLE CliUB OF 



Sepin chirotrema. 



Fig. 58. — Sepia 

 chirotrema $ [524], 

 v^entral view of 

 gladius (sepiostaire), 

 partiallj' recon 



structed. 



Fig. 59. — Sepior 

 chirotrema $ [524], 

 dorsal view of 

 gladius (sepiostaire), 

 partialh' recon- 



structed. 



