12 U.S. NATIONAL MUSEUM BULLETIN 234 



Web formula, the depth of each web sector given in decreasing order and 

 expressed alphabetically, A.B.C.D.E. 



TLI, tentacle length index: total length of tentacle and club as a per- 

 centage of mantle length. 



CLI, club length index: length of club as a percentage of mantle length. 

 Club length is measured from base of carpal cluster to tip, or, in 

 those species having no distinct carpal cluster, from first basal 

 true club sucker. In octopods, CLI is calamus length index. 



3. SucKEEs: 



Sis, sucker index (sessile) : diameter of largest arm sucker as a per- 

 centage of mantle length. 



Sit, sucker index (tentacular) : diameter of largest tentacular sucker as 

 a percentage of mantle length. 



Sin, sucker index (normal) : in octopods, the diameter of largest normal 

 sucker as a percentage of mantle length. 



Sle, sucker index (enlarged) : in octopod males, the diameter of largest 

 "special" sucker as a percentage of mantle length. 



4. Hectocottlus and Penis: 



HcAI, hectocotylized arm index: length of hectocotylized arm as a 



percentage of mantle length. 

 HcLI, hectocotylus length index: length of modified portion of arm 



measured from first modified sucker to tip as a percentage of length 



of hectocotylized arm. 

 CLI, in octopods, calamus length index: length of calamus, measured 



from last sucker to tip of spout as a percentage of ligula length. 

 LLI, in octopods, ligula length index: length of ligula measured from 



last sucker to tip of arm expressed as a percentage of length of 



hectocotylized arm. 

 PLI, in octopods, penis length index: length of penis and diverticulum 



ae a percentage of mantle length. 



5. Gladius and Shell Propobtions: 



GL, gladius length. 



GLI, gladius length index: length of gladius as a percentage of mantle 



length. 

 GWI, gladius width index: greatest width of gladius as a percentage of 



gladius length. 

 ShL, in Sepia, total length of shell (sepion) including spine. 

 ShWI, shell width index: greatest width of shell as a percentage of shell 



length. 

 LocLI, loculus length index: length of loculus as a percentage of shell 



length. 

 SnLI, spine length index: length of spine as a percentage of shell length. 



6. Spermatophore Proportions: 



SpL, spermatophore length: total length of spermatophore. 



SpLI, spermatophore length index: total length of spermatophore as a 



percentage of mantle length. 

 SpRI, sperm reservoir index: length of sperm reservoir as a percentage 



of the spermatophore length. 

 SpWI, spermatophore width index: width of spermatophore as a per- 

 centage of the spermatophore length. 



