272 
bulletin op the bureau of fisheries. 
4'. Dorsal arms of female connected by a broad velum, but without terminal expansions; no 
external shell; right third arm of male hectocotylized ; aquiferous pores present on head. 
Tremoctopus violaceus, p. 281. 
3'. No aquiferous pores; no external shell; dorsal arms normal. 
6. Body soft and gelatinous; suckers in two rows; hectocotylus of male involving entire 
right third arm, which is presumably separable Alloposus mollis, p. 287. 
6'. Body soft; suckers in a single row; hectocotylized arm not separable (family £oli- 
tmnidce) Eledonella sip., p. 289. 
6'". Body comparatively firm; suckers in two rows; hectocotylus of male confined to tip 
of one third arm, to which it forms a spoon-shaped extremity. (Family Polypodidce.) 
7. Hectocotylus affecting third arm of right side. (Genus Polypus). 
8. A conspicuous pigmented oculation obliquely in front of each eye ; hectocotylus 
minute Polypus marmoratus, p. 291. 
8^. No definite ocular markings in front of the eyes. 
9. Adult brightly colored, the pigment conspicuously arranged in longitudinal 
bands or series of spots; arms very long and attenuate . . .Polypus ornatus, p. 294. 
9'. No definitely arranged color pattern. 
10. Body smooth, without cirri; second arm pair longest; color dark. 
Polypus hawaiiensis , p. 290. 
10'. Body finely papillose, rather soft, with blunt cirri over the eyes; mantle 
opening small; color uniformly pale Polypus hoylei, p. 296. 
7'. Hectocotylus affecting third arm of left side; body bounded by a conspicuous periph- 
eral fold Scaurgus patagiatus , p. 305. 
II. Arms normally 10 in number, one pair being greatly modified to form the “tentacles”; suckers 
distinctly pedunculate, their apertures usually bounded by a chitinous ring (Dbcapoda). 
I. Eyes covered by a continuous membrane (division Myopsida). 
2. Adult small; body short, rounded posteriorly, with round or ovate lateral fins; gladius much 
reduced or wanting. (Family Sepiolidae.) 
3. Dorsal margin of mantle fused with head in nuchal region. 
4. Fins of moderate size; suckers in four rows on the arms and 16 or more on the tentacle 
club; left dorsal arm hectocotylized Euprymna scolopes, p. 312. 
4'. Fins very broad and longer than the mantle; suckers on the arms in two rows; a conspicuous 
shield-shaped patch on the ventral surface of the mantle Stoloteuthis iris, p. 316. 
3'. Dorsal margin of mantle free; funnel covered by a conspicuous forward prolongation of the 
mantle Heteroteuthis hawaiiensis, p. 319. 
2'. Adult relatively large; body elongate, pointed posteriorly; fins marginal, extending the entire 
length of the mantle; gladius well developed, its texture homy throughout. 
Sepioteuthis arctipinnis, p. 308. 
x'. Eyes with a perforated lid (division (Egopsida). 
5. Part of the suckers with their chitinous rings transformed to hooks. 
6. Sessile arms with true suckers only; one or more rows of hooks on tentacle club. 
7. Adult moderately large; two rows of hooks on the tentacle club. 
Onychoteuthis banksii, p. 322. 
7'. Adult small ; hooks and suckers of tentacle club in four rows. 
Teleoteuthis compacta, p. 324. 
6'. Sessile arms v/ith part of the suckers modified into hooks. (Family Enoploteuthidse.) 
8. All suckers of sessile arms modified into hooks except at the extremity; hooks also 
present on tentacle club ; ventral surface of mantle ornamented with numerous 
photogenic organs. 
9. Buccal membrane pale in color; tips of ventral arms normal. 
10. Photophores of mantle distinctly of two types and showing a definite bilateral 
arrangement; fins comparatively small Abralia astrosticta, p. 326. 
