274 
bui,i<etin of the bureau of fisheries. 
Order DIBRANCHIATA Owen 1836.» 
Antepedia Rafinesque 1815, p. 139 {fide Binney and Tryon, p. 14). 
Cryptodibranchiata de Blainville 1824, p. 172 {fide Verrill). 
Aciiabuliferes d’Orbigny 1835, p. i. 
Dibranchiata Owen 1836, p. 127. 
Acetabulifera d’Orbigny 1845, p. 157. 
Antepedia Gray 1849, p. 2. 
Dibranchia Pelseneer 1906, p. 336. 
Arms eight or (inclusive of the tentacles when present) ten in number; fiumished with longitudinal 
rows of acetabulae or suckers along their inner surfaces. Funnel a closed tube. Normally but a single 
pair each of ctenidia and renal organs present. Visceral mass naked ; shell much reduced and embedded 
in the tissues of the mantle, frequently absent. Eyes highly developed and with closed cavities; a 
crystalline lens present. Characteristic and intricately constructed dermal pigment cells called “chro- 
matophores” are developed in the integument. 
This order includes all living cephalopods except Nautilus. 
Suborder OCTOPODA Leach 1817. 
Octopia + Argonautea Rafinesque 1815, p. 139 {fide Binney and Trj'-on, p. 14). 
Octopoda Leach fide Gray. 
Octocera de Blainville 1824 {fide Verrill); 1825, p. 365. 
Octopoda d’Orbigny 1845, p. 163. 
Octopia Gray 1849, p. 2, 3. 
Octopoda Verrill 1881, p. 360. 
Arms normally always eight in number and similar (with the exception of the hectocotylized arm 
in the male); tentacles absent. Suckers sessile, usually with thickened bases; their apertures not 
equipped with horny or chitinous rings. Body usually short; always rounded posteriorly; finless, or 
rarely with one or two pairs of weak oar-shaped lateral fins. Head and mantle broadly continuous in 
the nuchal region. Ccelom greatly reduced. No gladius. Wherever hectocotylization occurs it is one 
arm of the third pair which is affected. With the exception of the recently described Melanoteuthis 
Joubin 1912, specialized photogenic organs are unknown in the entire suborder. 
Family CIRROTEUTHM Keferstein 1866 em. 
Pteroii Reinhardt and Prosch 1847, p. 38. 
CirrkoteutJiid<s Keferstein 1866, p. 1447. 
Cirrhotcuihidcs V'errill 1881, p, 382. 
Cirroteutkid<s Hoyle 1904, p. 3. 
Adult animals commonly of large size. Body equipped with one or sometimes two pairs of lateral 
oar-shaped fitis. A well-developed internal skeleton, comprising a broad saddle-shaped or horseshoe- 
shaped dorsal cartilage and a few lesser elements. Suckers in a single row which usually alternate with 
two flanking rows of paired cirri. Radula usually absent. 
Genus L.fflTMOTEUTHIS Berry 1913 . 
J^aetmoteuthis Berry 1913, p. 563. 
Adult of large size. Body rounded, with a small, weakly supported, transversely elongate fin 
attached to either side of the mantle. Arms moderately long; connected for the greater part of their 
length by an ample umbrella; intermediate web lacking. Suckers large, little elevated, in a single 
slightly zigzag row; paired cirri absent, or at best greatly reduced (possibly confined to the tips of the 
arms). Radula neither wanting nor reduced, but generously developed and with seven rows of teeth. 
a Date often given as 1832, but the paper upon which such quotation is based is unknown to me. 
