CEPHALOPODA OF THE HAWAIIAN ISLANDS. 
299 
[Polypus fontanianus (d’Orbigny 1835).] 
Octopus fontanianus d'Orbigny 1833, p. 28, pi. 2, fig. 5. 
Octopus fontanianus Tryon 1879, p. 123. pi. 37. fig- 54 (after d’Orbigny). 
This species is rather uncertainly listed from the “Sandwich Islands” by Tryon ( 1 . c., p. 124) on 
the authority of a specimen stated to be in the collection of the Academy of Natural Sciences of Phila- 
delphia. It is a South American species and hence its occurrence in ^ 
Hawaii needs a confirmation which it is not likely ever to receive. 
As the collections before me are unusually rich in immature individ- 
uals of this genus, some of which do not seem referable to any of the named 
species, I have thought it worth while to present a brief description of 
each of the various types into which as a rule the specimens may be easily 
separated. 
Poljrpus a (young). 
Polypus a Berry 1909, p. 418 (merely listed). 
Two juvenile Polypi in the Albatross collection agree in the following 
assemblage of characters: 
Body relatively large, ovate, saccular; much inflated, especially 
below; broadest anteriorly and terminating in an obtuse point or nipple- 
like projection behind. Mantle approximately smooth, with no definite 
papillae, tubercles, or cirri; mantle opening wide, extending to just below 
the eyes. 
Nuchal constriction prominent, almost furrow-like. Head short, 
broad, flattened. Eyes inconspicuous, slightly protruding, with very’^ 
small apertures. Ftmnel large, but not reaching to the base of the arms; 
in shape bluntly conical. 
Arms long, slender, attenuate; very tmequal, the order of length 1,2, 
3,4; connected at the extreme base by a short, delicate umbrella of nearly 
equal extent all around. Suckers small, numerous, crowded, in two rows. 
Color of preserved specimens everywhere pale, without markings of 
any kind. 
With one of the two specimens mentioned are two much smaller 
individuals (about 27 mm. long), which may represent an even yoimger Fig- 16.— a [192], ventral 
stage of the same species, but they differ from those described in their fTomstotiraXr X 2^*^^^ 
shorter, more tmiform arms, much larger eyes, and more oval body. by R. L. Hudson. 
Measurements op Polypus a. 
Number in author’s register 
Total length 
Tip of body to base of dorsal arms 
Length of body (dorsal) 
Width of body 
Width of neck 
Width of head 
Length of — 
Right dorsal arm 
Left dorsal arm 
I 9 I 
192 
Number in author’s register 
191 
192 
mm. 
mm. 
Length of — 
mm. 
mm. 
56 
45 
Right second arm 
34 
28 
18 
IS 
Left second arm 
33 
25 
14 
• 1 1 
Right third arm 
29 
21 
II 
9 
Left third arm 
29 
22 
6. 5 
6 
Right ventral arm 
25 - 5 
17 
8 
7 
Left ventral arm 
2$ 
17 
Umbrella between dorsal arms 
5 
3 
38 
30 
Umbrella between ventral arms 
4 
2 
38 
25 + 
Funnel 
6 
5 ‘S 
