16 bulletin: museum of comparative zoology. 



From the five species of Polypus, which have hitherto been deecribett as hav- 

 ing an ocellar spot in front of the eye, the present form is easily distinguished 

 as follows : — 



1. From P. pulcher (Brock) ('87, p. 607 j by the rough surface of the body, 

 combined with the absence of any specially prominent cirri. 



2. From P. areolatus (De Haan) (F^r. & D'Orb. '35, p. 65) by the dorsal 

 (not the fourth arms being the shortest), by the smaller development of the 

 arms, and by the centre of the eye-spot being light instead of dark. 



3. From P. ocellatiis (Appellof) ('86, p. 8) by the relative shortness of 

 the ventral arms, by the absence of a cirrus over the eye, by the ocellus being 

 situated nearer to the eye than to the umbrella margin, and by its having a 

 white centre. 



4. From P. memhranaceus (Quoy & Gaimard) ('32, p. 89) by the absence 

 of the lateral web on the body. 



5. From P. bimaculatm (Verrill, '83a, p. 121) by the rough granular surface, 

 with a distinct cirrus over each eye, and by the ocellar spot being of a purplish 

 black all over without any paler centre or ring. 



13. Polypus pusillus. 



(Plate 4, Fig. 5; Plate 5, Fig. 1.) 



Octopus pusillus Gould, '52, p. 478, Fig. 591. 



Octopus pusillus Tryon, '79, p. 112, Plate 31, Figs. 32, 33. 



Octopus pusillus Ortmann, '88, p. 614, Plate 21, Fig. 1. 



Station 3356, off Mariato Point ; February 23, 1891 ; lat. 7° 9' 30" N., long. 

 81° 8' 3u" \V., 546 fathoms; soft blue mud ; temperature, surface 83°, bottom 

 40.°1 ; one specimen 9, No. 7952. [H. 98.] 



Station 3358, off Cape Mala; February 24, 1891 ; lat. 6" 30' N., long. 81° 

 44' W., 535 fathoms; green sand; temperature, surface 83", bottom 40. °2; 

 one specimen 9> ^o- 7954. [H. 54.] 



SUitiim 3363, east of Cocos I.'^land; February 26, 1891 ; lat. 5° 43' N., long. 

 85° 5f/ W., 978 fathoms ; white globigerina ooze ; temperature, surface 83°, 

 bottom 37. °5; one specimen ^, No. 7949. [H. 38.] 



Station 3417, off Acapulco ; April 11, 1891 ; lat. 16° 32' N., long. 99° 48' W., 

 493 fathoms ; green mud ; temperature, surface 82°, bottom 40.°6; one specimen 

 9, No. 79.50. [11.37.] 



Station 3418, off Acapulco; April 11, 1891; lat. 16° 33' N., long. 99o 

 52' 30" W., 660 fathoms; brown wind, black sp. ; temperature, surface 82°, 

 bottom 39°; one specimen 9, No. 7953. [11. 43] 



It is not without hesitation that I refer all the.<e specimens to the above 

 species. Gould's descriptitm leaves something to be desired in the matter of 

 fulnes.s and prcci.'^ion, but the most conspicuous character (the lar^c globular 

 eyes) is shared by them ; they also agree in the size of the umbrella and in the 



