REPORT ON THE CEPHALOPODA. 



121 



Tlie Arms are unequal, the fourtli pair being the shortest (considerably so on the 

 right side); the first, second, and third are subequal; they are on an average of about the 

 same length as the body, smoothly conical, and taper evenly to fine points. The suckers 

 (fig. 14) are in two series throughout, pedunculate, 

 spherical, with a lateral aperture directed inwards 

 (figs. 11, 12); the horny ring is smooth and sur- 

 rounded by a few large papillse. The hectocotylus 

 is not developed. There is no trace of an umbrella. 

 The buccal membrane is well developed and has 

 the usual seven points, but they are not very well 

 marked nor provided with suckers ; the membrane 

 is not connected with the arms by ligaments. There 

 seems to be only one lip, which is thick and papillate 

 (fig. 13). 



The Tentacles arise directly between the third and fourth arms, exactly resembling 

 them at their origin, and being obviously serially homologous with them (figs. 10, 13) ; 

 the stem is swollen at first and somewhat more than one third up the arms narrows 

 rather suddenly to about half its previous diameter. The club is wanting in the unique 

 specimen. 



The Surface is smooth. 



The Colour is a dull purplish madder, paler on the fins (especially their under 

 surface) and on the arms and tentacles. 



The Gladius has not been extracted. 



Fig. 3. — Promachoteuthis megaptera, Hoyle ; 

 natural size. 



Dimensions, 



Length, total (to end of mutilated tentacle), 



End of body to mantle-margin, 



End of body to eye, 



Breadth of body, 



Breadth of head, 



Length of fin, 



Breadth across both fins. 



Diameter of largest sucker on sessile arm. 



Length of first arm, 

 Length of second arm, . 

 Length of third arm. 

 Length of fourth arm, . 

 Length of tentacle (mutilated), 

 Number of suckers on first arm, 

 Number of suckers on second arm, 

 Number of suckers on third arm, 

 Number of suckers on fourth arm, 



(ZOOL. CHALL. EXP. PART XLIV. 1 



50 mm. 



15 



18 



9 



6 

 11 

 23 



0-75 



Right. 



Left. 



13 mm. 



14 mm 



14-5 „ 



15 „ 



14 „ 



14 „ 



7 „ 



12 „ 



22 „ 



25 „ 



37 



37 



39 



39 



35 



39 



20 



31 





Xx 16 



