CEPHALOPODA OP THE HAWAIIAN ISLANDS. 

 Measurements op Tremoctopus violaceus. 



285 



Number in author's register. 



1 1 8 



218 



ix8 



Station where taken . 



3878 



3926 



3878 



3878 



4086 



3878 



3878 



Total length 



Length of mantle (dorsal) 



Width of mantle 



Width of neck 



Width of head 



Length of funnel 



Length of right dorsal arm 



Length of left dorsal arm 



Length of right second arm 



Length of left second arm 



Length of right third arm 



Length of left third arm 



Length of right ventral arm 



Length of left ventral arm 



Length of umbrella between dorsal arms. . 



Length of umbrella between ventral arms 



Length of umbrella between dorsal and 



second arms 



mm. 



64+ 



16 



IS 



13 



'5-5 



7 

 40+ 

 40+ 

 33 + 

 45 

 20 

 20 

 32 

 32 

 14 



3 



mm. 

 Si + 

 13 



7 

 37+ 

 27+ 

 37 

 34+ 

 15 

 J5 



25 

 13 

 3 



'7 



mm. 



48 



II 



5 

 34 

 31 

 28 

 17+ 

 II 

 11 

 16 

 16 



9 



fltm. 

 44+ 



2S + 

 31 + 

 27 



33 



9 

 9 

 8 

 10 



mm. 

 3° 



mm. 

 6 

 3 

 3 



-'■5 



mm. 

 3° 



mm. 

 24+ 



8 

 10 



8 



9 



S 

 10+ 

 10+ 



14+ 

 42 

 7 

 14 



mm. 



2S 



4 5 



9 

 9 



3-5 



mm. 

 'S 



mm. 

 14 

 45 



4-5 



1-5 



3-5 



35 



•5 



Material examined. — The 31 specimens examined are of various ages but almost equally males and 

 females: 



Xo. 

 speci- 

 mens. 



Locality. 



Lat. N. 29 22'. long. W. 139° 31'. between Erben Bank and Kaiwi Channel. 



Off Molokmi Islet, Kahoolawe 



Lat. N. 21 13'. long. W. i5S°43'. between Honolulu and Laysaa Island . . . . 

 Lat. N. 23 19', long. W. 166 54', between Honolulu and Laysan Island. . . . 

 Lat. N. 25 07', long. W. i7o°so\ between Honolulu and Laysan Island . . . . 

 Lat. N. 25 27'. long. W. 171° 08', between Honolulu and Laysan Island. . . . 



Between Kauai and Oahu 



do 



Off Puniawa Point. Maui 



Depth. 



Surface 

 ...do.... 



..do... 

 ...do.... 



..do.... 

 ...do..., 

 ...do.... 

 ...do..., 

 ...do.... 



Author's 



register 



No. 



si7 

 318 

 319 



330 

 321 

 333 

 333 

 334 

 335 



Remarks. — Owing to the great confusion which prevails in the various published accounts of the 

 species of this genus, the identification of even so excellent a series of specimens as the present is not an 

 easy task and the final conclusion attained is not altogether satisfying. It must be admitted that the 

 temptation is very great to unite practically all the alleged species of Tremoctopus under the oldest 

 name of which we chance to have knowledge as applied to a member of this group — the Tremoctopus 

 violaceus Delle Chiaje 1829. This is in effect what has been done by Jatta (1896, p. 204) and more 



o Jatta includes all the following in the synonymy of T. violaceus: 

 Octopus velifer Ferussac 1S30. 

 Philonexis Quoyanus d'Orbigny 1835. 

 Philonexis atlanticus d'Orbigny 1835. 

 Philonexis microstomus d'Orbigny 1835. 

 Philonexis hyalinus d'Orbigny 1835. 

 Octopus {Philonexis) brevipes d'Orbigny 1835. 

 Octopus semipalmatus Owen 1836. 

 * Octopus velatus Rang 1837. 

 Octopus Kollikeri Ve'rany 1847. 



17311°— 14 3 



