OCTOPODIDAE 



391 



(i) Form oblonga (13 (iv), 10 (iv), 5 (i)). The mantle is narrow (80-64) and the head 

 but little narrower (69-61). The arms are 73-67 per cent of the total length • The suckers 

 are very small, 7-8 per cent. The web is deep, 38-34 per cent. The propc^rtions of rfie 

 sectors vary. The eyes are rather large. There are .seven to eight filaments in t&ch demi- 

 branch. The funnel-organ is W-shaped. The surface is covered with rather widely 

 spaced, small granules. In 5 (i) these are larger than in the other two, and might pass as 

 small warts. 5 (i) is rather different from the other tvo, not only in sculpture but also 

 in its web (which is longer than in the other two examples and is in addition equal in 

 all its sectors save E) and in its wider body. The hectocotylus of 5 (i) and 10 (iv) are, 

 however, both long (15 and 13-9 per cent respectively) and very alike. The calamus is 

 acute and upstanding, the ligula rather shallower than in charcoti and crossed by a 

 number of deep laminae, which resemble those of a Bathypolyptis. 



Fig. 14. Graneledone poly- 

 morplia. Hectocotylus. x 3. 



Fig. 15. Graneledone polymorpha. Radula. 



(2) Form affinis (1,9, 11, 12, 14). The body is rather wide, its index being 104-70. 

 The head is usually much narrower, 93-53 per cent, the most usual form being that with 

 a globular body and small, clearly defined head. The arms are about as long as the form 

 oblonga, viz. 74-66. The suckers range from 11-6-7 P^^ cent. The web is distinctly 

 shallower (30-27 per cent) and tends to be rather regularly bilateral. The eyes are 

 moderate to large. The sculpture, as in oblonga, varies from fine, rather widely spaced 

 granules to granular warts. The funnel-organ is W-shaped. There are seven to ten 

 filaments in each demibranch. The hectocotylus (Fig. 14) varies from 17 to 9 per cent 

 (} 7 per cent) of the arm in length. The forms of the ligula and calamus are very like 

 those in var. oblonga, though the copulatory groove is narrower, and its walls corre- 

 spondingly thicker. This condition is best seen in the male from Station 42. In the 

 other males the organ is more like that of E. charcoti. 



In both forms the dorsal surface is demarcated from the ventral. In practically every 

 example there is a well-marked ridge, in some specimens amounting to a thick keel (e.g. 



