18 bulletin: museum of comparative zoology. 



15 Polypus januarii. 



(Plate 5, Fig. 2.) 



Octopus januarii Hoyle, '86, p. 97, Plate 7, Figs. 1-4. 



Habitat. — Station 3371, off Cocos Island; March 1, 1891; lat. 5« 26' 20" 

 N., long. SG^SS'W., 770 fathoms; globi«,'erma ooze; temperature, surface 

 82°, bottom 39° ; one specimen ^, No. 7944. [H. 41.] 



The body of this example was in a very rotten and disintegrated condition, 

 and among the debris at the bottom of the bottle I found several spermato- 

 phores. A portion of the radula is figured in Plate 5, Fig. 2. 



16. Polypus macropus? juv. 



Octopus macropus Risso, '26, p. 3. 



Octopus Cuvierti Fcrussac and d'Orbigny, '35, Poulpes, Plate 4. 



Octopus macropus Jatta, '96, p. 217. 



Habitat. — Arhuo Atoll, Marshall Islands ; January 24-26, 1900 ; lat. about 

 7° N., long, about 171° 30' E. ; surface of the lagoon, electric light; one young 

 specimen ?. [H. 111.] 



This small specimen, not qnite 10 cm. in total length, is mo.st likely the 

 young of the widely distributed Polypus macropus (Risso), or possibly of an 

 uudescribed species nearly allied to it. 



17. Polypus, sp. juv. 



(Plate 5, Figs. 3-9.) 



Habitat. — Station 335.3, off Cape Mala; February 23, 1891; lat. 7° 6' X., 

 long. 80° 34' W., 695 fathoms; green mud; temperature, surface 73°, bot- 

 tom 39°; 22 specimens, immature; No. 7941. [H. 73-94.] 



In the present instance a small shoal of young specimens would seem to 

 have been captured in the trawl. They are quite immature, as may be seen 

 fri>ra the fact that in some the yolk sac persists in the midst of the arms. I 

 am not aware that specimens as large as these have been found leading a free 

 e.xistence with the yolk sac still unabsorbed. I have seen advanced embryos 

 of Sepia and Loli/jo when artificially liberated swim freely and actively about, 

 though I do not know how long they can survive. 



The disposition of the suckers on the arms of these specimens is curious and 

 interesting, for they are sometimes in one row, sometimes in two. In the 

 majority of ca-ses the jjro.ximal and the distal suckers are in a single row 

 (Fig. 7), whilst a greater or smaller number in the middle of the arm are 

 aiTanged biserially (Fig. 6). There are, however, several cases in which the 

 whole of the suckers are in a single series, and these occur in specimens where 

 otlit-r arms have the arrangement descril)od above. The disposition is often 

 very irregular, especially where the uniserial arrangement is changing to the 



